Unrated
gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames
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.
Announced Source revision 1
Original source ↗CVE-2026-4438
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-4438
glibc
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "The GNU C Library",
"product": "glibc",
"versions": [
{
"status": "affected",
"version": "2.34",
"versionType": "custom",
"lessThanOrEqual": "2.43"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-4438
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28357 · Revision 1
- Added to Heist Feed
- Publisher date