CVE-2026-5450
CRITICALglibc 2.7-2.43 - Heap-based Buffer Overflow via scanf %mc with Explicit Width
Title source: llmDescription
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.
References (2)
Core 2
Core References
Issue Tracking issue-tracking
https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450
Mailing List mailing-list
https://inbox.sourceware.org/libc-announce/[email protected]/T/#u
Scores
CVSS v3
9.8
EPSS
0.0045
EPSS Percentile
35.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-122
CWE-787
Status
published
Products (2)
gnu/glibc
2.7 - 2.43
The GNU C Library/glibc
2.7
Published
Apr 20, 2026
Tracked Since
Apr 21, 2026