Red Hat Security Advisory: glibc security update
The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. Security Fix(es): * glibc: glibc: Incorrect DNS response parsing via crafted DNS server response (CVE-2026-4437) * glibc: glibc: Invalid DNS hostname returned via gethostbyaddr functions (CVE-2026-4438) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The glibc packages in Red Hat Enterprise Linux 10 contain two security vulnerabilities. CVE-2026-4437 is related to incorrect parsing of DNS responses when crafted by a malicious DNS server, potentially causing improper handling of DNS data. CVE-2026-4438 involves the gethostbyaddr functions returning invalid DNS hostnames, which could impact applications relying on hostname resolution. Both vulnerabilities affect critical system libraries including libc, libpthread, libm, and nscd. Red Hat has released updated glibc packages to address these issues as detailed in advisory RHSA-2026:19061.
Potential Impact
These vulnerabilities impact the core C libraries used by multiple programs on the system, which are essential for Linux system operation. Incorrect DNS response parsing and invalid hostname resolution could lead to unexpected behavior in applications relying on DNS, potentially affecting system stability or security. The advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated glibc packages for Red Hat Enterprise Linux 10 to fix these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:19061 and the referenced article https://access.redhat.com/articles/11258. Since this is an on-premises product, system administrators must manually apply the update to remediate the issues. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: glibc security update
Description
The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. Security Fix(es): * glibc: glibc: Incorrect DNS response parsing via crafted DNS server response (CVE-2026-4437) * glibc: glibc: Invalid DNS hostname returned via gethostbyaddr functions (CVE-2026-4438) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The glibc packages in Red Hat Enterprise Linux 10 contain two security vulnerabilities. CVE-2026-4437 is related to incorrect parsing of DNS responses when crafted by a malicious DNS server, potentially causing improper handling of DNS data. CVE-2026-4438 involves the gethostbyaddr functions returning invalid DNS hostnames, which could impact applications relying on hostname resolution. Both vulnerabilities affect critical system libraries including libc, libpthread, libm, and nscd. Red Hat has released updated glibc packages to address these issues as detailed in advisory RHSA-2026:19061.
Potential Impact
These vulnerabilities impact the core C libraries used by multiple programs on the system, which are essential for Linux system operation. Incorrect DNS response parsing and invalid hostname resolution could lead to unexpected behavior in applications relying on DNS, potentially affecting system stability or security. The advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated glibc packages for Red Hat Enterprise Linux 10 to fix these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:19061 and the referenced article https://access.redhat.com/articles/11258. Since this is an on-premises product, system administrators must manually apply the update to remediate the issues. 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-2026:19061
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-4438"]
- State
- PUBLISHED
Threat ID: 6a160977e29bf47b50643b10
Added to database: 05/26/2026, 20:58:31 UTC
Last enriched: 08/16/2026, 18:32:27 UTC
Last updated: 09/12/2026, 22:01:34 UTC
Views: 146
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