CVE-2026-107161

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 0.28%
EPSS Percentile: 18.74%
CISA KEV: Not listed

Description

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secalert@redhat.com
Published: 08-Oct-2026 03:17
Last Modified: 10-Oct-2026 10:17
EPSS Date: 2026-10-14
CWE: CWE-122

CVSS Vector


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

References

Last enrichment sync: 14-Oct-2026 22:18
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-107161 Microsoft October 2026 Updates Fix 1,411 Flaws, Including Three Zero-Days

CVE (1235)

People (2)

MITRE ATT&CK (1)

Vendors (14)

Products (87)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.