VulnerabilityModified
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.
CRITICAL 9.8EPSS 0.50%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-787
- Affected
- gnu/glibc
- Source
- 3ff69d7a-14f2-4f67-a097-88dee7810d18
References
- https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#uThird Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450Exploit, Issue Tracking
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450Exploit, Issue Tracking
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.