CVE-2026-5450 Details
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.
A heap buffer overflow vulnerability has been identified in the GNU C Library (glibc) versions 2.7 through 2.43. This issue arises when the scanf family of functions is used with the %mc (malloc'd character match) format specifier, particularly with a width greater than 1024. The vulnerability allows for a controlled one-byte overwrite of the heap buffer, which could potentially be exploited.
A patch for this vulnerability has been proposed and is available for review.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 21, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-082556.html | siemens-SADP | |
| https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450 | CISA-ADP | ExploitIssue Tracking |
| https://inbox.sourceware.org/libc-announce/[email protected]/T/#u | GNU C Library | Third Party Advisory |
| https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450 | GNU C Library | ExploitIssue Tracking |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
| CWE-122 | Heap-based Buffer Overflow | GNU C Library |
Affected Products
| Product | Versions |
|---|---|
| gnu glibc | >= 2.7, <= 2.43 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | siemens-SADP |
| Jun 17, 2026 | CVE Modified | GNU C Library |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 23, 2026 | Initial Analysis | [email protected] |
| Apr 21, 2026 | CVE Modified | CISA-ADP |
| Apr 20, 2026 | New CVE Received | GNU C Library |