4

CVE-2026-57053: gnu libidn

CVSS: 4.0v3.1MediumAnalyzed
AliasesMGASA-2026-0262SUSE-SU-2026:23621-1SUSE-SU-2026:4000-1
Published 23-06-2026Last modified 23-06-2026
Open JSON

Vulnerability summary

CVE-2026-57053 is a medium (CVSS 4.0) vulnerability in gnu libidn. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.0/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 23-06-2026
    PublishedVulnerability first disclosed.
  2. 23-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

-0.01 pp

From 0.15% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (lists.gnu.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Suse4 products
  • libidn&distro=SUSE Linux Enterprise Module for Basesystem 15 SP7< 1.34-150000.3.5.1
  • libidn&distro=SUSE Linux Enterprise Server 16.0< 1.43-160000.3.1
  • libidn&distro=SUSE Linux Enterprise Server for SAP applications 16.0< 1.43-160000.3.1
  • libidn&distro=SUSE Linux Enterprise Server LTSS Extended Security 12 SP5< 1.28-5.9.1
Redhat3 products
  • idn2< 0:2.3.8-4.hum1
  • libidn2< 0:2.3.8-4.hum1
  • libidn2-devel< 0:2.3.8-4.hum1
Mageia2 products
  • libidn< 1.43-2.1.mga10
  • libidn< 1.41-2.1.mga9
Debian1 product
  • libidnAll versions (No fix recorded) | < 1.44-1
Gnu1 product
  • libidn< 1.44 | ≥ 0.1.15, < 1.44
Opensuse1 product
  • libidn&distro=openSUSE Leap 16.0< 1.43-160000.3.1
Ubuntu1 product
  • libidnAll versions (No fix recorded) | < 1.38-4ubuntu1.1 | < 1.42-1ubuntu0.1 | < 1.43-2ubuntu0.26.04.1

7 vendors · 13 products

References

22 links
Show all 22 references