CVE-2026-107161 (GCVE-0-2026-107161)

Vulnerability from cvelistv5 – Published: 2026-10-07 19:29 – Updated: 2026-10-10 02:42
VLAI
Title
Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 2026-10-10 02:42 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1059 records in the last 180 days details
References
Impacted products
Date Public
2026-10-07 17:53
Credits
This issue was discovered by Bruno Fournier and Found by AISLE in partnership with Red Hat.
Show details on NVD website
To clipboard 

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              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-10-07T17:53:01.497Z",
              "value": "Made public."
            }
          ],
          "title": "Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients",
          "workarounds": [
            {
              "lang": "en",
              "value": "If DIGEST-MD5 authentication is not strictly required, remove the optional cyrus-sasl-md5 package to eliminate the vulnerable plugin:\n\n# dnf remove cyrus-sasl-md5\n\nAlternatively, configure client applications to disable DIGEST-MD5 and HTTP Digest authentication methods, prioritizing stronger mechanisms such as GSSAPI or SCRAM.\n\nCaveat: Removing cyrus-sasl-md5 removes support for both DIGEST-MD5 and CRAM-MD5 mechanisms. Any client or server process depending on these algorithms will fail to negotiate authentication. Active services utilizing SASL may need to be restarted to unload the plugin from memory."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-107161",
        "datePublished": "2026-10-07T19:29:28.164Z",
        "dateReserved": "2026-10-07T11:00:41.139Z",
        "dateUpdated": "2026-10-10T02:42:51.112Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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