Vulnerability-Lookup

CVE-2026-52829 (GCVE-0-2026-52829)

Vulnerability from cvelistv5 – Published: 2026-08-18 19:27 – Updated: 2026-08-18 19:44

Title

ZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address Book

Summary

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 19:44 UTC

CWE

CWE-617 - Reachable Assertion
CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7838 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/ZcashFoundation/zebra/security…	x_refsource_CONFIRM
https://github.com/ZcashFoundation/zebra/commit/1…	x_refsource_MISC
https://github.com/ZcashFoundation/zebra/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
ZcashFoundation	zebra	Affected: < 4.5.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-52829",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T19:44:48.869272Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-18T19:44:56.318Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "zebra",
          "vendor": "ZcashFoundation",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.5.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-617",
              "description": "CWE-617: Reachable Assertion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-843",
              "description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T19:27:57.318Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8"
        },
        {
          "name": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd"
        },
        {
          "name": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"
        }
      ],
      "source": {
        "advisory": "GHSA-63wg-wjjj-7cp8",
        "discovery": "UNKNOWN"
      },
      "title": "ZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address Book"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52829",
    "datePublished": "2026-08-18T19:27:57.318Z",
    "dateReserved": "2026-06-08T18:11:06.662Z",
    "dateUpdated": "2026-08-18T19:44:56.318Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52829",
      "date": "2026-10-27",
      "epss": "0.00609",
      "percentile": "0.48958"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "zebra",
                "vendor": "ZcashFoundation",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 4.5.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0."
          },
          {
            "lang": "es",
            "value": "ZEBRA es un nodo Zcash escrito completamente en Rust. Antes de la versi\u00f3n 4.5.0, un par IPv4 no autenticado puede terminar de forma determinista un nodo Zebra sincronizado utilizando la configuraci\u00f3n predeterminada del oyente de pila dual de Linux. La ruta de handshake canoniz\u00f3 una direcci\u00f3n PeerSocketAddr IPv6 mapeada a IPv4, como ::ffff:127.0.0.1, a IPv4 simple antes de almacenarla a trav\u00e9s de MetaAddr::new_connected, pero la ruta de mal comportamiento del mempool reenvi\u00f3 la direcci\u00f3n transitoria sin procesar a MetaAddrChange::UpdateMisbehavior. En zebra-network/src/meta_addr.rs, apply_to_meta_addr luego compar\u00f3 la entrada can\u00f3nica de la libreta de direcciones con la direcci\u00f3n de actualizaci\u00f3n sin procesar y alcanz\u00f3 su aserci\u00f3n de falta de coincidencia de direcci\u00f3n inesperada. Despu\u00e9s del vaciado del lote de mal comportamiento, panic igual a abortar termin\u00f3 zebrad; el par solo necesitaba completar un handshake P2P y anunciar una transacci\u00f3n de mempool inv\u00e1lida. Este problema est\u00e1 solucionado en la versi\u00f3n 4.5.0."
          }
        ],
        "id": "CVE-2026-52829",
        "lastModified": "2026-10-22T22:10:00.250",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-52829",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T19:44:48.869272Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-18T20:17:18.330",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-617"
              },
              {
                "lang": "en",
                "value": "CWE-843"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-52829",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-18T19:44:48.869272Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-18T19:44:52.268Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "zebra",
              "vendor": "ZcashFoundation",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 4.5.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-617",
                  "description": "CWE-617: Reachable Assertion",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-843",
                  "description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-18T19:27:57.318Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8"
            },
            {
              "name": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd"
            },
            {
              "name": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"
            }
          ],
          "source": {
            "advisory": "GHSA-63wg-wjjj-7cp8",
            "discovery": "UNKNOWN"
          },
          "title": "ZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address Book"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-52829",
        "datePublished": "2026-08-18T19:27:57.318Z",
        "dateReserved": "2026-06-08T18:11:06.662Z",
        "dateUpdated": "2026-08-18T19:44:56.318Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-52829

Vulnerability from fkie_nvd - Published: 2026-08-18 20:17 - Updated: 2026-10-22 22:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd
	security-advisories@github.com	https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0
	security-advisories@github.com	https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "zebra",
          "vendor": "ZcashFoundation",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.5.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0."
    },
    {
      "lang": "es",
      "value": "ZEBRA es un nodo Zcash escrito completamente en Rust. Antes de la versi\u00f3n 4.5.0, un par IPv4 no autenticado puede terminar de forma determinista un nodo Zebra sincronizado utilizando la configuraci\u00f3n predeterminada del oyente de pila dual de Linux. La ruta de handshake canoniz\u00f3 una direcci\u00f3n PeerSocketAddr IPv6 mapeada a IPv4, como ::ffff:127.0.0.1, a IPv4 simple antes de almacenarla a trav\u00e9s de MetaAddr::new_connected, pero la ruta de mal comportamiento del mempool reenvi\u00f3 la direcci\u00f3n transitoria sin procesar a MetaAddrChange::UpdateMisbehavior. En zebra-network/src/meta_addr.rs, apply_to_meta_addr luego compar\u00f3 la entrada can\u00f3nica de la libreta de direcciones con la direcci\u00f3n de actualizaci\u00f3n sin procesar y alcanz\u00f3 su aserci\u00f3n de falta de coincidencia de direcci\u00f3n inesperada. Despu\u00e9s del vaciado del lote de mal comportamiento, panic igual a abortar termin\u00f3 zebrad; el par solo necesitaba completar un handshake P2P y anunciar una transacci\u00f3n de mempool inv\u00e1lida. Este problema est\u00e1 solucionado en la versi\u00f3n 4.5.0."
    }
  ],
  "id": "CVE-2026-52829",
  "lastModified": "2026-10-22T22:10:00.250",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-52829",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T19:44:48.869272Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T20:17:18.330",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        },
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-63WG-WJJJ-7CP8

Vulnerability from github – Published: 2026-07-02 20:26 – Updated: 2026-07-02 20:26

Summary

Zebra Address Book Aborted by IPv4-Mapped Mempool Misbehavior Update

Details

Am I affected

You are affected if:

You run zebrad up to and including v4.4.1.
Your node listens on the default [::] address on a Linux host (the standard deployment configuration — net.ipv6.bindv6only=0 is the default on all common Linux distributions).
Your node is synced near the chain tip (the expected production state for any node participating in the network).

Summary

An address normalization mismatch between the handshake path and the mempool misbehavior path causes a deterministic assertion panic when a peer connects via IPv4 to a dual-stack IPv6 listener and then triggers a mempool misbehavior penalty.

The handshake path canonicalizes IPv4-mapped IPv6 addresses to plain IPv4 when storing the peer in the address book via MetaAddr::new_connected. The mempool misbehavior path forwards the raw transient socket address (IPv4-mapped IPv6 form) when sending MetaAddrChange::UpdateMisbehavior to the address book. The address book looks up the canonical IPv4 entry but then asserts that the previous entry's address matches the change's address. The mismatch between the canonical IPv4 address and the raw IPv4-mapped IPv6 address triggers the assertion, and panic = "abort" terminates the process.

Details

On Linux with net.ipv6.bindv6only=0, an IPv4 connection accepted by a [::] listener is represented internally as an IPv4-mapped IPv6 socket address (e.g., ::ffff:127.0.0.1:8233). Zebra's canonical_peer_addr helper converts these to plain IPv4 (e.g., 127.0.0.1:8233).

The handshake path uses MetaAddr::new_connected, which canonicalizes the address before storing in the address book. However, inbound inventory registration uses connected_addr.get_transient_addr(), preserving the raw IPv4-mapped form. When the mempool later downloads an invalid transaction from this peer and generates a misbehavior penalty, the raw transient address is forwarded through the misbehavior channel to MetaAddrChange::UpdateMisbehavior, which does not canonicalize.

After the 30-second misbehavior batch flush, AddressBook::update retrieves the canonical IPv4 entry but MetaAddrChange::apply_to_meta_addr asserts that previous.addr == self.addr(), which fails because one is IPv4 and the other is IPv4-mapped IPv6.

The attacker needs only to complete a P2P handshake over IPv4 to a dual-stack listener and advertise an invalid mempool transaction (such as a coinbase transaction). The assertion fires after the 30-second misbehavior batch flush.

Patches

Patched in Zebra 4.5.0. The fix canonicalizes the address in the misbehavior update path via a new MetaAddr::new_misbehavior constructor that applies canonical_peer_addr before creating the UpdateMisbehavior change.

Workarounds

Configuring listen_addr to an IPv4-only address (e.g., 0.0.0.0:8233) avoids the IPv4-mapped IPv6 representation and prevents this specific assertion. Alternatively, setting net.ipv6.bindv6only=1 on Linux prevents dual-stack acceptance.

Impact

A remote unauthenticated peer can deterministically crash any synced Zebra node running the default Linux dual-stack configuration with a single invalid mempool transaction advertisement, followed by a 30-second wait. The attack requires no mining capability, no RPC access, no funds, and no special privileges. The crash can be repeated after each restart, causing persistent downtime. Linux dual-stack sockets and mempool activation are the default production state, not special preconditions.

Credit

Reported by @Haxatron.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.0"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "zebra-network"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.4.1"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "zebrad"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52829"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617",
      "CWE-843"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:26:56Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Am I affected\n\nYou are affected if:\n\n1. You run `zebrad` up to and including `v4.4.1`.\n2. Your node listens on the default `[::]` address on a Linux host (the standard deployment configuration \u2014 `net.ipv6.bindv6only=0` is the default on all common Linux distributions).\n3. Your node is synced near the chain tip (the expected production state for any node participating in the network).\n\n### Summary\n\nAn address normalization mismatch between the handshake path and the mempool misbehavior path causes a deterministic assertion panic when a peer connects via IPv4 to a dual-stack IPv6 listener and then triggers a mempool misbehavior penalty.\n\nThe handshake path canonicalizes IPv4-mapped IPv6 addresses to plain IPv4 when storing the peer in the address book via `MetaAddr::new_connected`. The mempool misbehavior path forwards the raw transient socket address (IPv4-mapped IPv6 form) when sending `MetaAddrChange::UpdateMisbehavior` to the address book. The address book looks up the canonical IPv4 entry but then asserts that the previous entry\u0027s address matches the change\u0027s address. The mismatch between the canonical IPv4 address and the raw IPv4-mapped IPv6 address triggers the assertion, and `panic = \"abort\"` terminates the process.\n\n### Details\n\nOn Linux with `net.ipv6.bindv6only=0`, an IPv4 connection accepted by a `[::]` listener is represented internally as an IPv4-mapped IPv6 socket address (e.g., `::ffff:127.0.0.1:8233`). Zebra\u0027s `canonical_peer_addr` helper converts these to plain IPv4 (e.g., `127.0.0.1:8233`).\n\nThe handshake path uses `MetaAddr::new_connected`, which canonicalizes the address before storing in the address book. However, inbound inventory registration uses `connected_addr.get_transient_addr()`, preserving the raw IPv4-mapped form. When the mempool later downloads an invalid transaction from this peer and generates a misbehavior penalty, the raw transient address is forwarded through the misbehavior channel to `MetaAddrChange::UpdateMisbehavior`, which does not canonicalize.\n\nAfter the 30-second misbehavior batch flush, `AddressBook::update` retrieves the canonical IPv4 entry but `MetaAddrChange::apply_to_meta_addr` asserts that `previous.addr == self.addr()`, which fails because one is IPv4 and the other is IPv4-mapped IPv6.\n\nThe attacker needs only to complete a P2P handshake over IPv4 to a dual-stack listener and advertise an invalid mempool transaction (such as a coinbase transaction). The assertion fires after the 30-second misbehavior batch flush.\n\n### Patches\n\nPatched in Zebra 4.5.0. The fix canonicalizes the address in the misbehavior update path via a new `MetaAddr::new_misbehavior` constructor that applies `canonical_peer_addr` before creating the `UpdateMisbehavior` change.\n\n### Workarounds\n\nConfiguring `listen_addr` to an IPv4-only address (e.g., `0.0.0.0:8233`) avoids the IPv4-mapped IPv6 representation and prevents this specific assertion. Alternatively, setting `net.ipv6.bindv6only=1` on Linux prevents dual-stack acceptance.\n\n### Impact\n\nA remote unauthenticated peer can deterministically crash any synced Zebra node running the default Linux dual-stack configuration with a single invalid mempool transaction advertisement, followed by a 30-second wait. The attack requires no mining capability, no RPC access, no funds, and no special privileges. The crash can be repeated after each restart, causing persistent downtime. Linux dual-stack sockets and mempool activation are the default production state, not special preconditions.\n\n### Credit\n\nReported by `@Haxatron`.",
  "id": "GHSA-63wg-wjjj-7cp8",
  "modified": "2026-07-02T20:26:56Z",
  "published": "2026-07-02T20:26:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ZcashFoundation/zebra"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Zebra Address Book Aborted by IPv4-Mapped Mempool Misbehavior Update"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-52829 (GCVE-0-2026-52829)

FKIE_CVE-2026-52829

GHSA-63WG-WJJJ-7CP8

Am I affected

Summary

Details

Patches

Workarounds

Impact

Credit

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour