Vulnerability-Lookup

GHSA-HPPC-G8H3-XHP3

Vulnerability from github – Published: 2026-04-22 21:00 – Updated: 2026-04-27 16:29

Summary

rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer

Details

The FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure's returned usize directly to OpenSSL without checking it against the &mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences.

Severity

8.3 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.24"
            },
            {
              "fixed": "0.10.78"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41898"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-126",
      "CWE-130"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T21:00:57Z",
    "nvd_published_at": "2026-04-24T18:16:29Z",
    "severity": "HIGH"
  },
  "details": "The FFI trampolines behind `SslContextBuilder::set_psk_client_callback`, `set_psk_server_callback`, `set_cookie_generate_cb`,  and `set_stateless_cookie_generate_cb` forwarded the user closure\u0027s returned usize directly to OpenSSL without checking it against the `\u0026mut [u8]` that was handed to the closure. This can lead to buffer overflows and other unintended consequences.",
  "id": "GHSA-hppc-g8h3-xhp3",
  "modified": "2026-04-27T16:29:44Z",
  "published": "2026-04-22T21:00:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41898"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/pull/2607"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff99b24c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rust-openssl/rust-openssl"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer"
}

CVE-2026-41898 (GCVE-0-2026-41898)

Vulnerability from cvelistv5 – Published: 2026-04-24 17:20 – Updated: 2026-04-24 18:01

Title

rust-openssl: Unchecked callback-returned length in PSK and cookie generate trampolines can cause OpenSSL to leak adjacent memory to the network peer

Summary

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure's returned usize directly to OpenSSL without checking it against the &mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences. This vulnerability is fixed in 0.10.78.

Severity

8.3 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-24 18:01 UTC

CWE

CWE-126 - Buffer Over-read
CWE-130 - Improper Handling of Length Parameter Inconsistency

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/rust-openssl/rust-openssl/secu…	x_refsource_CONFIRM
https://github.com/rust-openssl/rust-openssl/pull/2607	x_refsource_MISC
https://github.com/rust-openssl/rust-openssl/comm…	x_refsource_MISC
https://github.com/rust-openssl/rust-openssl/rele…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
rust-openssl	rust-openssl	Affected: >= 0.9.24, < 0.10.78

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41898",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-24T18:01:38.714785Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-24T18:01:47.877Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "rust-openssl",
          "vendor": "rust-openssl",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.9.24, \u003c 0.10.78"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "rust-openssl provides OpenSSL bindings for the Rust programming language.  From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure\u0027s returned usize directly to OpenSSL without checking it against the \u0026mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences. This vulnerability is fixed in 0.10.78."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126: Buffer Over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "CWE-130: Improper Handling of Length Parameter Inconsistency",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T17:20:38.073Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/pull/2607",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/pull/2607"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff99b24c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff99b24c"
        },
        {
          "name": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"
        }
      ],
      "source": {
        "advisory": "GHSA-hppc-g8h3-xhp3",
        "discovery": "UNKNOWN"
      },
      "title": "rust-openssl: Unchecked callback-returned length in PSK and cookie generate trampolines can cause OpenSSL to leak adjacent memory to the network peer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41898",
    "datePublished": "2026-04-24T17:20:38.073Z",
    "dateReserved": "2026-04-22T15:11:54.672Z",
    "dateUpdated": "2026-04-24T18:01:47.877Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.