Vulnerability-Lookup

CVE-2026-63626 (GCVE-0-2026-63626)

Vulnerability from cvelistv5 – Published: 2026-10-14 18:26 – Updated: 2026-10-15 15:06

Title

Mongoose: ppp_handle_ipv6cp() uses attacker-controlled length without bounds check — OOB read and heap overflow (PPP/PPPoE, MG_ENABLE_IPV6)

Summary

Mongoose is an embedded web server and network library. Prior to 7.23, ppp_handle_ipv6cp() in src/l2_ppp.c trusts the 16-bit IPv6CP len field without checking it against the received payload size. On a PPP or PPPoE link using MG_ENABLE_TCPIP and MG_ENABLE_IPV6, an unauthenticated adjacent peer can complete the required LCP exchange and send a short Configure-Request with an oversized length, causing ppp_tx_frame() to read beyond recv_queue.buf and write beyond tx.buf. The same length misuse can also expose adjacent heap bytes in a reply or hang the event loop through find_opt(). This issue is fixed in version 7.23.

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 13:53 UTC

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7657 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/cesanta/mongoose/security/advi…	x_refsource_CONFIRM
https://github.com/cesanta/mongoose/commit/751f14…	x_refsource_MISC
https://github.com/cesanta/mongoose/releases/tag/7.23	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
cesanta	mongoose	Affected: < 7.23	guessed

Show details on NVD website

JSON

To clipboard

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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "mongoose: Mongoose: Buffer overflow via oversized IPv6CP packet length",
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      "version": "3"
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              "name": "https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9"
            },
            {
              "name": "https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903",
              "tags": [
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          ],
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            "discovery": "UNKNOWN"
          },
          "title": "Mongoose: ppp_handle_ipv6cp() uses attacker-controlled length without bounds check \u2014 OOB read and heap overflow (PPP/PPPoE, MG_ENABLE_IPV6)"
        }
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}

FKIE_CVE-2026-63626

Vulnerability from fkie_nvd - Published: 2026-10-14 19:17 - Updated: 2026-10-16 20:04

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903
	security-advisories@github.com	https://github.com/cesanta/mongoose/releases/tag/7.23
	security-advisories@github.com	https://github.com/cesanta/mongoose/security/advisories/GHSA-pc66-j6r6-49x9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mongoose",
          "vendor": "cesanta",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.23"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mongoose is an embedded web server and network library. Prior to 7.23, ppp_handle_ipv6cp() in src/l2_ppp.c trusts the 16-bit IPv6CP len field without checking it against the received payload size. On a PPP or PPPoE link using MG_ENABLE_TCPIP and MG_ENABLE_IPV6, an unauthenticated adjacent peer can complete the required LCP exchange and send a short Configure-Request with an oversized length, causing ppp_tx_frame() to read beyond recv_queue.buf and write beyond tx.buf. The same length misuse can also expose adjacent heap bytes in a reply or hang the event loop through find_opt(). This issue is fixed in version 7.23."
    }
  ],
  "id": "CVE-2026-63626",
  "lastModified": "2026-10-16T20:04:29.760",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/cesanta/mongoose/commit/751f14742dea934bec08a507ab1fecc3673d4903"
    },
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    },
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          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

UBUNTU-CVE-2026-63626 (CVE-2026-63626)

Vulnerability from osv_ubuntu – Published: 2026-08-14 00:00 – Updated: 2026-08-14 00:00 – Source website

Details

[Built-in TCP/IP PPP IPV6CP option parsing bounds check]

Severity

8.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-63626	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-63626	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mongoose-webserver-source",
            "binary_version": "7.23+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "mongoose",
        "purl": "pkg:deb/ubuntu/mongoose@7.23+ds-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.21+ds-1",
        "7.21+ds-2",
        "7.22+ds-1",
        "7.23+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "[Built-in TCP/IP PPP IPV6CP option parsing bounds check]",
  "id": "UBUNTU-CVE-2026-63626",
  "modified": "2026-08-14T00:00:00Z",
  "published": "2026-08-14T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-63626"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-63626"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-63626"
  ]
}

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

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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.

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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.

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CVE-2026-63626 (GCVE-0-2026-63626)

FKIE_CVE-2026-63626

UBUNTU-CVE-2026-63626 (CVE-2026-63626)

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Related by attack behaviour