libidn: GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of misha...
CVE-2026-57053 is fixed in 15 products on 1 platform, first by idn 1.43-2ubuntu0.26.04.1, released June 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| idn · Ubuntu 22.04.1 LTS (jammy) | 1.38-4ubuntu1.1 | idn 1.38-4ubuntu1.1 | Jul 10, 2026 |
| idn · Ubuntu 24.04.5 LTS (noble) | 1.42-1ubuntu0.1 | idn 1.42-1ubuntu0.1 | Jul 10, 2026 |
| idn · Ubuntu 26.04.1 LTS (resolute) | 1.43-2ubuntu0.26.04.1 | idn 1.43-2ubuntu0.26.04.1 | Jun 23, 2026 |
| libidn · Debian 14 | 1.44-1 | DEBIAN-CVE-2026-57053 | Jun 24, 2026 |
| libidn · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn · opensuse-leap 16.0 | 1.43-160000.3.1 | OPENSUSE-SU-2026:21758-1 | Sep 4, 2026 |
| libidn · sles 15.7 | 1.34-150000.3.5.1 | SUSE-SU-2026:4000-1 | Sep 7, 2026 |
| libidn · sles 16.0 | 1.43-160000.3.1 | SUSE-SU-2026:23621-1 | Sep 4, 2026 |
| libidn-debuginfo · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn-debugsource · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn-devel · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn-java · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn-javadoc · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-ACF66846EE | Aug 3, 2026 |
| libidn12 · Ubuntu 22.04.1 LTS (jammy) | 1.38-4ubuntu1.1 | libidn12 1.38-4ubuntu1.1 | Jul 10, 2026 |
| libidn12 · Ubuntu 24.04.5 LTS (noble) | 1.42-1ubuntu0.1 | libidn12 1.42-1ubuntu0.1 | Jul 10, 2026 |
| libidn12 · Ubuntu 26.04.1 LTS (resolute) | 1.43-2ubuntu0.26.04.1 | libidn12 1.43-2ubuntu0.26.04.1 | Jun 23, 2026 |
| mingw-libidn · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw32-libidn · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw32-libidn-debuginfo · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw32-libidn-static · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw64-libidn · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw64-libidn-debuginfo · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
| mingw64-libidn-static · Fedora 43 | 1.44-1.fc43 | FEDORA-2026-7DDAFB24A3 | Aug 2, 2026 |
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