Low
gss-ntlmssp — security advisory
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.
- Products
- gss-ntlmssp
- Affected versions
- 0.6.0-1, 0.7.0-3, 0.7.0-3~ubuntu0.16.04.1, 0.7.0-3~ubuntu0.16.04.1+esm1, 0.7.0-4, 0.7.0-4build1, 0.7.0-4build3, 0.7.0-4build4, 0.7.0-4ubuntu0.18.04.1~esm1, 0.7.0-4ubuntu0.20.04.1~esm1, 0.7.0-4ubuntu0.22.04.1~esm1, 1.2.0-1, 1.2.0-1build1, 1.2.0-1build2, 1.2.0-1build3, 1.2.0-1build4, 1.2.0-1build5, 1.3.1-1, 1.3.1-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-91926
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:31 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-91926
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
gss-ntlmssp
Fixed versions: Not specified
Complete source record
{
"id": "1eadb1d080e5a093c223964a09fc5d92ede6fe8795d6430e05a1987dcd44c1e4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-91926",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-91926",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-91926",
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],
"severity": "low",
"structured": {
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"aliases": [
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"metrics": [
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},
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],
"modified": "2026-10-17T13:01:17.160684679Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-91926",
"https://www.cve.org/CVERecord?id=CVE-2026-91926",
"https://bugzilla.redhat.com/show_bug.cgi?id=2533698"
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},
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"source_id": "core-osv",
"document_id": 361501,
"published_at": "2026-09-15T12:17:00+00:00"
}