← Vulnerability feed

Vulnerability record · CVE-2026-5450 · published 20 April 2026

CVE-2026-5450: Gnu glibc heap-based buffer overflow vulnerability

Gnu · Glibc

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.

9.8 CVSS 3.1 Critical EPSS 0.72% · top 48.0% CWE-122 · Heap-based buffer overflowCWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
14 Jul 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://inbox.sourceware.org/libc-announce/[email protected]/T/#u Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450 ExploitIssue Tracking
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450 ExploitIssue Tracking

Track CVE-2026-5450 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2023-4911GNU C Library ld.so GLIBC_TUNABLES heap buffer overflowThe GNU C Library dynamic loader ld.so mishandles the GLIBC_TUNABLES environment variable, causing a heap-based buffer overflow and out-of-bounds wri…KEVEPSS 81%analysed10.0CVE-2015-0235glibc gethostbyname heap buffer overflow (GHOST)CVE-2015-0235 is a heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc 2.2 and other 2.x versions before 2.18. It is reach…EPSS 95%analysed9.8CVE-2023-0687Gnu glibc classic buffer overflow vulnerabilityA vulnerability was found in GNU C Library 2.38. It has been declared as critical. This vulnerability affects the function __monstartup of the file g…EPSS 1.1%9.8CVE-2023-25139Gnu glibc out-of-bounds write vulnerabilitysprintf in the GNU C Library (glibc) 2.37 has a buffer overflow (out-of-bounds write) in some situations with a correct buffer size. This is unrelate…EPSS 1.4%9.8CVE-2022-23218Gnu glibc classic buffer overflow vulnerabilityThe deprecated compatibility function svcunix_create in the sunrpc module of the GNU C Library (aka glibc) through 2.34 copies its path argument on t…EPSS 4.8%9.8CVE-2022-23219Gnu glibc classic buffer overflow vulnerabilityThe deprecated compatibility function clnt_create in the sunrpc module of the GNU C Library (aka glibc) through 2.34 copies its hostname argument on …EPSS 4.3%9.8CVE-2021-33574Gnu glibc use after free vulnerabilityThe mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It may use the notification thread attributes ob…EPSS 2.9%9.8CVE-1999-0199Gnu glibc unchecked return value vulnerabilitymanual/search.texi in the GNU C Library (aka glibc) before 2.2 lacks a statement about the unspecified tdelete return value upon deletion of a tree's…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2026-5450), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.