Red Hat Security Advisory: glibc security update
A heap buffer overflow vulnerability exists in the GNU C Library (glibc) when using the scanf function with the %mc format specifier and a large width. This vulnerability affects the standard C libraries used by Linux systems, which are critical for system functionality. Red Hat has issued a security advisory for this issue, rating it as moderate severity. The vulnerability is tracked as CVE-2026-5450 and affects Red Hat Enterprise Linux 8.6 versions. A security update is available to address this flaw.
AI Analysis
Technical Summary
CVE-2026-5450 is a heap buffer overflow vulnerability in glibc's scanf function when processing the %mc format specifier with a large width. This flaw could lead to memory corruption due to improper handling of input data. The issue affects the standard C libraries (libc, libpthread, libm) and the name service cache daemon (nscd) on Linux systems. Red Hat has released an update for Red Hat Enterprise Linux 8.6 to fix this vulnerability, classified as having a moderate security impact.
Potential Impact
The vulnerability could allow an attacker to cause a heap buffer overflow, potentially leading to memory corruption. This could affect the stability and security of the system since glibc is a core component used by many programs. No known exploits in the wild have been reported at this time. The impact is rated as moderate by Red Hat.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 8.6 to address this vulnerability. Users should apply the glibc update as described in Red Hat advisory RHSA-2026:33227 and the referenced article https://access.redhat.com/articles/11258. Applying this update will remediate the heap buffer overflow issue in scanf. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: glibc security update
Description
A heap buffer overflow vulnerability exists in the GNU C Library (glibc) when using the scanf function with the %mc format specifier and a large width. This vulnerability affects the standard C libraries used by Linux systems, which are critical for system functionality. Red Hat has issued a security advisory for this issue, rating it as moderate severity. The vulnerability is tracked as CVE-2026-5450 and affects Red Hat Enterprise Linux 8.6 versions. A security update is available to address this flaw.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-5450 is a heap buffer overflow vulnerability in glibc's scanf function when processing the %mc format specifier with a large width. This flaw could lead to memory corruption due to improper handling of input data. The issue affects the standard C libraries (libc, libpthread, libm) and the name service cache daemon (nscd) on Linux systems. Red Hat has released an update for Red Hat Enterprise Linux 8.6 to fix this vulnerability, classified as having a moderate security impact.
Potential Impact
The vulnerability could allow an attacker to cause a heap buffer overflow, potentially leading to memory corruption. This could affect the stability and security of the system since glibc is a core component used by many programs. No known exploits in the wild have been reported at this time. The impact is rated as moderate by Red Hat.
Mitigation Recommendations
Red Hat has released an official security update for Red Hat Enterprise Linux 8.6 to address this vulnerability. Users should apply the glibc update as described in Red Hat advisory RHSA-2026:33227 and the referenced article https://access.redhat.com/articles/11258. Applying this update will remediate the heap buffer overflow issue in scanf. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:33227
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a42ed1327e9c79719930e0b
Added to database: 06/29/2026, 22:09:23 UTC
Last enriched: 06/29/2026, 22:12:19 UTC
Last updated: 06/30/2026, 01:51:15 UTC
Views: 4
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