CVE-2026-57053

EUVD-2026-38523
GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idna_to_unicode_internal. The affected code is not present in libidn2.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
4 MEDIUM
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
gnulibidn
𝑥
< 1.44
CNA
Debian logo
Debian Releases
Debian Product
Codename
libidn
bookworm
vulnerable
bullseye
vulnerable
forky
1.44-1
fixed
sid
1.44-1
fixed
trixie
no-dsa
Common Weakness Enumeration
References
https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html
https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html