VDB
CVE-2026-4438
CVE-2026-4438
PUBLISHED
CVSS 5.400000095367432 MEDIUM
Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.
EPSS 0.07% · 20.6th percentile
Risk Scores
CVSS 3.1
5.400000095367432
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS Score
0.07%
20.6th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| gnu | glibc | 2.34 |
| The GNU C Library | glibc | 2.34, 2.34 |
Exploit Intelligence
- CIRCL seen: CVE-2026-4438 (circl-sighting)
- CIRCL seen: CVE-2026-4438 (circl-sighting)
- https://sourceware.org/bugzilla/show_bug.cgi?id=34015 (nist-nvd)
- CIRCL seen: CVE-2026-4438 (circl-sighting)
- dockerscan.yml (github-poc)
- sec-build.yaml (github-poc)
- dockerscan.yml (github-poc)
- dockerscan.yml (github-poc)
- dockerscan.yml (github-poc)
- sec-build.yaml (github-poc)
…and 9 more exploits
Timeline
- Mar 20, 2026 PoC Published
- Mar 20, 2026 CVE Published
- Mar 21, 2026 EPSS Score
- Mar 22, 2026 EPSS Score
- Mar 22, 2026 Coalition ESS Score
- Mar 23, 2026 EPSS Score
- Mar 23, 2026 Coalition ESS Score
- Mar 23, 2026 CVE Updated
- Mar 24, 2026 EPSS Score
- Mar 24, 2026 Coalition ESS Score
- Mar 25, 2026 EPSS Score
- Mar 25, 2026 Coalition ESS Score
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=34015 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-4438 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32748 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4438 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23347 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23268 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23392 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23319 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23253 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23296 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23364 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23368 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27654 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-30922 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23286 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23396 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23340 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23324 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33515 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23318 advisory
…and 59 more