CVE-2026-91926
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk14th 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.
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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