Out-of-bounds Read Affecting glibc package, versions [2.43,2.44)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-GLIBC-15857077
- published31 Mar 2026
- disclosed20 Mar 2026
- creditAntonio Maini, Kevin Farrell
Introduced: 20 Mar 2026
CVE-2026-4437 (opens in a new tab)How to fix?
Upgrade glibc to version 2.44 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the gethostbyaddr or gethostbyaddr_r process when a crafted DNS response is received from a configured DNS server. An attacker can cause the application to treat non-answer sections of a DNS response as valid answers by sending specially crafted DNS responses. This is only exploitable if the system's nsswitch.conf is configured to use the library's DNS backend.