ubuntu-cve-2026-40892
Vulnerability from osv_ubuntu
Published
2026-04-21 21:16
Modified
2026-05-20 15:27
Summary
Details

PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST). The function copies credential data using cred_info->data.slen as the length without an upper-bound check, which can overflow the fixed-size ha1 stack buffer (128 bytes) if data.slen exceeds the expected digest string length.

Severity
8.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

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          {
            "binary_name": "asterisk-mp3",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-mysql",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-ooh323",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          },
          {
            "binary_name": "asterisk-tests",
            "binary_version": "1:22.5.2~dfsg+~cs6.15.60671435-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "asterisk",
        "purl": "pkg:deb/ubuntu/asterisk@1:22.5.2~dfsg+~cs6.15.60671435-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:22.5.2~dfsg+~cs6.15.60671435-1"
      ]
    }
  ],
  "aliases": [],
  "details": "PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST). The function copies credential data using cred_info-\u003edata.slen as the length without an upper-bound check, which can overflow the fixed-size ha1 stack buffer (128 bytes) if data.slen exceeds the expected digest string length.",
  "id": "UBUNTU-CVE-2026-40892",
  "modified": "2026-05-20T15:27:26Z",
  "published": "2026-04-21T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40892"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40892"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-2wcg-w3c4-48r7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pjsip/pjproject/commit/c82123ea6f3c3652bbc9ebd5e9e658c301451687"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40892"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.