OESA-2026-4303 (CVE-2026-107161)

Vulnerability from osv_openeuler – Published: 2026-10-16 11:59 – Updated: 2026-10-16 11:59 – Source website
VLAI
Summary
cyrus-sasl security update
Details

The package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.

Security Fix(es):

A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application.(CVE-2026-107161)

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "cyrus-sasl-2.1.28-12.oe2403sp3.aarch64.rpm",
          "cyrus-sasl-debuginfo-2.1.28-12.oe2403sp3.aarch64.rpm",
          "cyrus-sasl-debugsource-2.1.28-12.oe2403sp3.aarch64.rpm",
          "cyrus-sasl-devel-2.1.28-12.oe2403sp3.aarch64.rpm",
          "cyrus-sasl-lib-2.1.28-12.oe2403sp3.aarch64.rpm",
          "cyrus-sasl-sql-2.1.28-12.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "cyrus-sasl-help-2.1.28-12.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "cyrus-sasl-2.1.28-12.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "cyrus-sasl-2.1.28-12.oe2403sp3.x86_64.rpm",
          "cyrus-sasl-debuginfo-2.1.28-12.oe2403sp3.x86_64.rpm",
          "cyrus-sasl-debugsource-2.1.28-12.oe2403sp3.x86_64.rpm",
          "cyrus-sasl-devel-2.1.28-12.oe2403sp3.x86_64.rpm",
          "cyrus-sasl-lib-2.1.28-12.oe2403sp3.x86_64.rpm",
          "cyrus-sasl-sql-2.1.28-12.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "cyrus-sasl",
        "purl": "pkg:rpm/openEuler/cyrus-sasl\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.28-12.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The  package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.\r\n\r\nSecurity Fix(es):\n\nA heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application.(CVE-2026-107161)",
  "id": "OESA-2026-4303",
  "modified": "2026-10-16T11:59:08Z",
  "published": "2026-10-16T11:59:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4303"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107161"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "cyrus-sasl security update",
  "upstream": [
    "CVE-2026-107161"
  ]
}



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