CVE-2026-4438
Published: March 24, 2026Last modified: April 2, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.4 |
| Attack Vector | ADJACENT_NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | LOW |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | glibc | Fixed (2.37.0-r22) |
| 25 LTS | glibc | Fixed (2.39.0-r7) | |
| Stream | glibc | Fixed (2.39.0-r8) | |
| Hardened Containers | 23 LTS | glibc | Fixed (2.37.0-r22) |
| 25 LTS | glibc | Fixed (2.39.0-r7) | |
| Stream | glibc | Fixed (2.39.0-r8) |