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CVE-2026-91926— Gss-ntlmssp: gss-ntlmssp: memory leak in ntlm_decode_target_info via duplicated av_pair entries in ntlm challenge

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gss-ntlmssp 中发现了一个缺陷：在 NTLM target-info 解析器中存在内存泄漏。 当精心构造的 NTLM CHALLENGE 消息中包含重复的字符串值 AV_PAIR 条目时，解析器会为每个字符串值分配内存，但当同一 AV_PAIR 类型出现多次时，不会释放之前的内存分配，从而导致早期分配的内存发生泄漏。恶意服务器或中间人攻击者可以利用此漏洞，在 NTLM 认证过程中逐步耗尽客户端的内存，最终导致服务拒绝（DoS）。

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-91926

Vulnerability Information
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Vulnerability Title
Gss-ntlmssp: gss-ntlmssp: memory leak in ntlm_decode_target_info via duplicated av_pair entries in ntlm challenge
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2026-91926

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III. Intelligence Information for CVE-2026-91926

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Vendor Advisories for CVE-2026-91926 (1)

Other References for CVE-2026-91926 (1)

Same Patch Batch · Red Hat · 2026-09-15 · 5 CVEs total

CVE-2026-75092 7.3 HIGH Leapp-repository: leapp-upgrade-el9toel10: leapp-upgrade-el9toel10: scan_mysql runs mysqld
CVE-2026-81303 6.3 MEDIUM Hawtio-operator: hawtio-operator: routes/custom-host confused-deputy via spec.routehostnam
CVE-2026-91786 6.1 MEDIUM Gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvali
CVE-2026-81320 5.5 MEDIUM Hawtio-operator: hawtio-operator: tls private key written to operator log at debug level

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-401

V. Comments for CVE-2026-91926

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