What is CVE-2026-57053?

CVE-2026-57053 is a medium-severity vulnerability in Gnu Libidn, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.0/10. Published 2026-06-23.

How severe is CVE-2026-57053?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Vulnerability in Gnu Libidn

CVE-2026-57053

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 v3 metric

CVSS v3 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.

Affected products

Gnu Libidn — versions 0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-57053?: CVE-2026-57053 is a medium-severity vulnerability in Gnu Libidn, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.0/10. Published 2026-06-23.
How severe is CVE-2026-57053?: Medium severity. CVSS v3 base score is 4.0 out of 10.