CVE-2026-18374

Published: Aug 27, 2026Updated: Sep 3, 2026 Sources: CVE List NVDCWE-787

4.9MEDIUM

NVD MITRE

Description

Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:LAvailability

Low

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Weaknesses

CWE-787

Affected Products

The GNU C Library

oss-projectaka glibc

glibcLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

Privilege Escalation

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References

https://sourceware.org/bugzilla/show_bug.cgi?id=34574

sourceware.org

https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0015

sourceware.org

http://www.openwall.com/lists/oss-security/2026/08/27/6

openwall.com

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