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CVE-2026-57053

20
FAUCET Score

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 published: Jun 23, 2026Last modified: Jun 23, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.1.15, < 1.44CPE matchmatch criteria
cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*
>= 0, < 1.44CPE match
cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.0MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
1.4
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.15%
Probability of exploitation in next 30 days
EPSS Percentile
4.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0015 is in the 26th percentile among its peer group of 223 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

ubuntupatch availablevia ubuntu_usn
Product: libidn (jammy)Fixed in: 1.38-4ubuntu1.1
ubuntupatch availablevia ubuntu_usn
Product: libidn (noble)Fixed in: 1.42-1ubuntu0.1
ubuntupatch availablevia ubuntu_usn
Product: libidn (resolute)Fixed in: 1.43-2ubuntu0.26.04.1

Vendor Advisories (1)

ubuntuUSN-8521-1

Libidn vulnerability

Jul 9, 2026

References

lists.gnu.org / archive/html/help-libidn/2026-05/msg00000.html
ExploitMailing List
lists.gnu.org / archive/html/help-libidn/2026-06/msg00001.html
Mailing List