How severe is CVE-2026-57053?

CVE-2026-57053 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-57053 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57053?

CVE-2026-57053 affects Gnu Libidn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57053?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-57053 have an EU (EUVD) identifier?

Yes. CVE-2026-57053 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38523.

When was CVE-2026-57053 published?

CVE-2026-57053 was published on 2026-06-23 and last updated on 2026-06-29.

CVE-2026-57053

CVE-2026-57053 is a medium-severity vulnerability in Gnu Libidn with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38523
Weakness: CWE-1284
Affected product: Gnu Libidn
Published: 2026-06-23
Last modified: 2026-06-29

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-57053?: CVE-2026-57053 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-57053 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57053?: CVE-2026-57053 affects Gnu Libidn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57053?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-57053 have an EU (EUVD) identifier?: Yes. CVE-2026-57053 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38523.
When was CVE-2026-57053 published?: CVE-2026-57053 was published on 2026-06-23 and last updated on 2026-06-29.

References

Affected products (1)

cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*

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