CVE-2026-4438

EUVD-2026-13798
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.
Argument Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 13%
Affected Products (NVD)
VendorProductVersion
gnuglibc
2.34 ≤
𝑥
≤ 2.43
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
glibc
bookworm
no-dsa
bookworm (security)
vulnerable
bullseye
postponed
bullseye (security)
vulnerable
forky
2.42-15
fixed
sid
2.42-16
fixed
trixie
no-dsa
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
glibc
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-32bit
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-devel
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-devel-32bit
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-devel-static
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-extra
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-i18ndata
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-info
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-lang
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-locale
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-locale-base
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-locale-base-32bit
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-profile
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
glibc-utils
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
libnsl1
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
libnsl1-32bit
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
nscd
suse enterprise desktop 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise sap 15 SP7
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP6
2.38-150600.14.46.1
fixed
suse enterprise server 15 SP7
2.38-150600.14.46.1
fixed
Common Weakness Enumeration
References
https://sourceware.org/bugzilla/show_bug.cgi?id=34015