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GNU C Library CVE-2026-6791

| EUVDEUVD-2026-55729 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-08-10 glibc GHSA-ch73-g8qv-r6r5
Stack Overflow Buffer Overflow Glibc Red Hat Suse
6.6
CVSS 4.0 · Vendor: glibc
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Severity by source

Vendor (glibc) PRIMARY
6.6 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:L/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.1 HIGH

AV:N because input reaches glibc via networked applications; AC:H because wordexp() must be called on attacker input; S:C captures downstream application and service availability impact beyond the library itself.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:L/SA:H
SUSE
MEDIUM
qualitative
Red Hat
5.9 MEDIUM
qualitative

Primary rating from Vendor (glibc).

CVSS VectorVendor: glibc

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 10, 2026 - 19:33 vuln.today
CVE Published
Aug 10, 2026 - 18:41 cve.org
MEDIUM 6.6

DescriptionCVE.org

When expanding paths that begin with a tilde (~) followed by a username, the internal parse_tilde function extracts the username to determine the user's home directory. The implementation allocates memory for this username directly on the stack using the strndupa macro. Because the size of this allocation was determined by the length of the user-supplied input without any bounds checks, passing an excessively long username e.g. thousands of characters, forces the thread to exhaust its stack space. Thus if an application passes untrusted, attacker-controlled input to the wordexp function, an attacker can trigger a stack clash.

AnalysisAI

Stack clash vulnerability in glibc's wordexp() function allows remote attackers to exhaust thread stack space via a crafted tilde-expanded path argument. The parse_tilde internal function uses strndupa - a GNU macro that allocates directly on the stack - to extract a username from attacker-controlled input, with no bounds check on the allocation size. …

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Vulnerability AssessmentAI

Exploitation Exploitation requires that a reachable application calls glibc's wordexp() function with an attacker-controlled string that begins with a tilde followed by a username (e.g., '~<attacker-supplied-string>'). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:N/UI:N) scores 6.6, and the metric choices are internally consistent with the described vulnerability: AV:N is appropriate because the trigger path can originate from a networked application input, PR:N because no authentication is needed against glibc itself, but AC:H reflects the critical application-level dependency - an exploitable path only exists when an application invokes wordexp() with unsanitized, attacker-controlled strings, which is not the default or common pattern. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch version has been independently confirmed at time of analysis; the upstream fix status should be monitored via the glibc Bugzilla entry at https://sourceware.org/bugzilla/show_bug.cgi?id=34091 and downstream distribution security advisories. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
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CVE-2026-6791 vulnerability details – vuln.today
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