Out-of-bounds Read Affecting libidn2 package, versions <0:2.3.8-4.hum1


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-RHEL10-LIBIDN2-18492147
  • published1 Aug 2026
  • disclosed23 Jun 2026

Introduced: 23 Jun 2026

CVE-2026-57053  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade RHEL:10 libidn2 to version 0:2.3.8-4.hum1 or higher.
This issue was patched in RHSA-2026:42125.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libidn2 package and not the libidn2 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1