{"id":"CVE-2026-91926","aliases":["AZL-107957","DEBIAN-CVE-2026-91926","EUVD-2026-78441","GHSA-x7fj-4fx4-9f96","UBUNTU-CVE-2026-91926"],"status":"published","title":"Gss-ntlmssp: gss-ntlmssp: memory leak in ntlm_decode_target_info via duplicated av_pair entries in ntlm challenge","description":"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.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00371,"percentile":0.3142,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-401"],"published":"2026-09-15T11:49:10Z","modified":"2026-11-05T05:36:30Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"gssntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.3.1-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.3.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.3.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.3.1-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.0-1","0.7.0-3~ubuntu0.16.04.1","0.7.0-3~ubuntu0.16.04.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.0-3","0.7.0-4","0.7.0-4build1","0.7.0-4build3","0.7.0-4ubuntu0.18.04.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.0-4build3","0.7.0-4ubuntu0.20.04.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.0-4build3","0.7.0-4build4","0.7.0-4ubuntu0.22.04.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.2.0-1build1","1.2.0-1build2","1.2.0-1build3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1build5","1.3.1-1","1.3.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"gss-ntlmssp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1build4","1.2.0-1build5"]}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 8"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-91926","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533698","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91926","tags":["web"]},{"url":"https://github.com/advisories/GHSA-x7fj-4fx4-9f96"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-91926","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-91926","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91926","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-91926","title":"Gss-ntlmssp: gss-ntlmssp: memory leak in ntlm_decode_target_info via duplicated av_pair entries in ntlm challenge","description":"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.","status":"published","published":"2026-09-15T11:49:10.516Z","modified":"2026-11-06T19:56:33.639Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-401"],"updated_at":"2026-11-06T20:30:05.375225Z"}],"euvd":[{"id":"EUVD-2026-78441","description":"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.","status":"published","published":"2026-09-15T11:49:10Z","modified":"2026-11-06T19:56:33Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-06T21:07:00.111123Z"}],"ghsa":[{"id":"GHSA-x7fj-4fx4-9f96","title":"A flaw was found in gss-ntlmssp. A memory leak occurs in the NTLM target-info parser when a...","description":"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.","status":"published","published":"2026-09-15T12:31:47Z","modified":"2026-09-15T12:31:54Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T15:11:54.134441Z"}],"nvd":[{"id":"CVE-2026-91926","description":"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.","status":"published","published":"2026-09-15T12:17:54.5Z","modified":"2026-11-06T20:17:28.823Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"}],"cwes":["CWE-401"],"updated_at":"2026-11-06T22:02:13.634375Z"}],"osv":[{"id":"DEBIAN-CVE-2026-91926","description":"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.","status":"published","published":"2026-09-15T12:17:54.5Z","modified":"2026-11-07T09:47:25.336745494Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-07T10:14:39.995311Z"},{"id":"UBUNTU-CVE-2026-91926","description":"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.","status":"published","published":"2026-09-15T12:17:00Z","modified":"2026-10-17T13:01:17.160684679Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T16:57:40.980117Z"},{"id":"AZL-107957","title":"CVE-2026-91926 affecting package gssntlmssp 1.3.1-1","description":"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.","status":"published","published":"2026-09-15T12:17:54Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:18.199293Z"}]}}