CVE-2026-5450

CRITICAL

9.8

Description

Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/20/2026

Last Modified4/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

gnu:glibc

Weaknesses (CWE)

CWE-122CWE-787

References

https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u(3ff69d7a-14f2-4f67-a097-88dee7810d18)

https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450(3ff69d7a-14f2-4f67-a097-88dee7810d18)

https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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