| Name | CVE-2026-57053 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libidn (PTS) | bullseye | 1.33-3 | vulnerable |
| bookworm | 1.41-1 | vulnerable |
| trixie | 1.43-1 | vulnerable |
| sid, forky | 1.44-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libidn | source | (unstable) | 1.44-1 | | | |
Notes
[trixie] - libidn <no-dsa> (Minor issue)
https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html
https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html