CVE-2026-57053

Publication date 23 June 2026

Last updated 9 July 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.0 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
libidn 26.04 LTS resolute
Fixed 1.43-2ubuntu0.26.04.1
25.10 questing
Needs evaluation
24.04 LTS noble
Fixed 1.42-1ubuntu0.1
22.04 LTS jammy
Fixed 1.38-4ubuntu1.1
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libidn

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.0 · Medium

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

References

Related Ubuntu Security Notices (USN)

Other references

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