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.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
GNU libidn unaffected
Version Status Constraints
0 affected < 1.44

No data.

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Project Subscriptions

Vendors Products
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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html cve-icon
https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html cve-icon
History

Tue, 23 Jun 2026 19:45:00 +0000

Type Values Removed Values Added
Title Out‑of‑Bounds Read in libidn’s ToUnicode API

Tue, 23 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 23 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
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.
First Time appeared Gnu
Gnu libidn
Weaknesses CWE-1284
CPEs cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*
Vendors & Products Gnu
Gnu libidn
References
Metrics cvssV3_1

{'score': 4, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-23T17:40:14.173Z

Reserved: 2026-06-23T16:40:22.560Z

Link: CVE-2026-57053

cve-icon Vulnrichment

Updated: 2026-06-23T17:40:10.988Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-23T19:30:04Z

Weaknesses