Is CVE-2026-57053 in the CISA KEV catalog?

No. CVE-2026-57053 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-57053?

CVE-2026-57053 has a CVSS v3 base score of 4.0 (MEDIUM).

What is the EPSS score for CVE-2026-57053?

CVE-2026-57053 has an EPSS score of 0.11% (2th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-57053?

Upgrade libidn on debian unstable to 1.44-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-57053

MEDIUM

4.0

CVSS v3

NVD

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.

CWE-1284

How to fix

Remediation Available

libidnDebian

Fixed in:1.44-1CVE-2026-57053

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.11%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Exploit1

lists.gnu.org

Mailing List1

lists.gnu.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-29.