Discovery API Icon
Discovery API
Security Advisory Icon
Security Advisory
Package Manager Icon
Package Manager
Alpaquita LinuxStreamSecurity Advisory
Search Cve

CVE-2026-8674

Published: September 19, 2026Last modified: September 25, 2026

Description

Initializing the DNS stub resolver from an /etc/resolv.conf file, or a LOCALDOMAIN environment variable, whose search list contains a domain of roughly 200 characters or more in the GNU C Library version 2.26 to 2.44 results in an assertion failure which aborts the process. The resolver truncates the search list when copying it into the fixed-size _res.defdname buffer, then asserts that the copy is consistent with the full configuration. The consistency check compared against the wrong size and did not handle a first entry that does not fit, so a correctly truncated list failed the assertion. Any process that resolves names through the library is affected, including long-running processes that reload /etc/resolv.conf on the next query after it changes. Search domains are commonly written to /etc/resolv.conf from data received over DHCP or from a VPN server, so an attacker on the local network may be able to trigger this without privileges on the target system, subject to validation by the network configuration software.

Severity score breakdown

ParameterValue
Base score5.3
Attack VectorADJACENT_NETWORK
Attack complexityHIGH
Privileges requiredNONE
User interactionNONE
ScopeUNCHANGED
ConfidentialityNONE
Integrity impactNONE
Availability impactHIGH
VectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Status

ProductReleasePackageStatus
Alpaquita Linux25 LTSglibcFixed (2.39.0-r16)
StreamglibcFixed (2.43.0-r8)

References

ON THIS PAGE