CVE-2026-5450

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.

Score

CVSS 3.1 9.8 Critical

Status

Modified - 3ff69d7a-14f2-4f67-a097-88dee7810d18

Published

2026-04-20

Last modified

2026-10-15

Weaknesses

CWE-122, CWE-787

Affected products

• Glibc (Gnu)
• Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
• Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
• Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
• Glibc (The Gnu C Library)

References

• https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u
• https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html