CVE catalog
CVE-2026-91926
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 memor
- Severity
- Low · CVSS 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | gss-ntlmssp | sid | 1.3.1-1 | vulnerable |
| Debian | gss-ntlmssp | forky | 1.3.1-1 | vulnerable |
| Debian | gss-ntlmssp | trixie | 1.2.0-1 | vulnerable |
| Debian | gss-ntlmssp | bookworm | 1.2.0-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | gss-ntlmssp | source | sid | (unfixed) | not yet assigned | Not reported | [1148174] |
| Debian | gss-ntlmssp | source | forky | (unfixed) | not yet assigned | Not reported | [1148174] |
| Debian | gss-ntlmssp | source | trixie | (unfixed) | not yet assigned | Not reported | [1148174] |
| Debian | gss-ntlmssp | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148174] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [gss-ntlmssp]Affected
Details (2)
1.2.0-1· amd64 · bookwormAffected
nvd · gss-ntlmssp · debian · bookworm; nvd · gss-ntlmssp · debian · 12
1.2.0-1· arm64 · bookwormAffected
nvd · gss-ntlmssp · debian · bookworm; nvd · gss-ntlmssp · debian · 12
- [gss-ntlmssp-dev]Affected
Source package: [gss-ntlmssp]
Details (2)
1.2.0-1· amd64 · bookwormAffected
nvd · gss-ntlmssp · debian · bookworm; nvd · gss-ntlmssp · debian · 12
1.2.0-1· arm64 · bookwormAffected
nvd · gss-ntlmssp · debian · bookworm; nvd · gss-ntlmssp · debian · 12
[Debian 13 (Trixie)]
- [gss-ntlmssp]Affected
Source package: [gss-ntlmssp]
Details (2)
1.2.0-1+b2· amd64 · trixieAffected
nvd · gss-ntlmssp · debian · 13
1.2.0-1+b3· arm64 · trixieAffected
nvd · gss-ntlmssp · debian · 13
- [gss-ntlmssp-dev]Affected
Source package: [gss-ntlmssp]
Details (2)
1.2.0-1+b2· amd64 · trixieAffected
nvd · gss-ntlmssp · debian · 13
1.2.0-1+b3· arm64 · trixieAffected
nvd · gss-ntlmssp · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-91926]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-91926]
- [https://security-tracker.debian.org/tracker/CVE-2026-91926]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91926.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]