CVE Catalog

CVE-2026-91926

LowCVSS 3.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.23%

14th percentile - higher than 14% of all known CVEs

Summary

gss-ntlmssp contains a memory leak in the NTLM target-info parser when a crafted NTLM CHALLENGE message contains duplicated string-valued AV_PAIR entries. The parser allocates memory for each string value but does not free the previous allocation when the same AV_PAIR type appears more than once, leading to gradual memory exhaustion on the client during NTLM authentication.

Risk Assessment

A malicious or man-in-the-middle server can gradually exhaust client memory during NTLM authentication, resulting in denial of service (DoS).

Recommendation

Upgrade gss-ntlmssp to a version containing the memory leak fix in the NTLM target-info parser; until then, limit connections to untrusted NTLM servers.

Related vulnerabilities

Original NVD description (English source)

A flaw was found in gss-ntlmssp. A memory leak occurs in the NTLM target-info parser when a crafted NTLM CHALLENGE message contains duplicated string-valued AV_PAIR entries. The parser allocates memory for each string value but does not free the previous allocation when the same AV_PAIR type appears more than once, leaking the earlier allocation. A malicious or man-in-the-middle server can exploit this to cause gradual memory exhaustion on the client during NTLM authentication, leading to a denial of service.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS