Low severity · published Jun 23, 2026
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
2.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libidn · GNU
before 1.44 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57053
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57053
Exploit
https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html
Mailing List
https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html
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