TI-2026-41060 Aliases CVE-2026-57053 GHSA-xpv7-vm32-p7wv

GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the…

LOW 18CWE-1284Published 2026-06-23 · Updated 2026-06-23

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: Partial Red Hat: 1 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00139 3rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial libidn (GNU): 1.44Red Hat: 1 advisoryRed Hat: 1 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
GNU	libidn	before 1.44	1.44	Patch available	CNA

libidn VendorGNU Affected before 1.44 Fixed in 1.44 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:gnu:libidn::::::::	0.1.15 to before 1.44	Vulnerable	GNU

cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:* Versions 0.1.15 to before 1.44 Vulnerable ·GNU

Remediation

Fix · CNA libidn (GNU) Fixed in 1.44

Red Hat 1 advisory

RHSA-2026:42125 Released 2026-07-20 · Red Hat rating Moderate
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images idn2-2.3.8-4.hum1@aarch64, idn2-2.3.8-4.hum1@x86_64, libidn2-2.3.8-4.hum1@aarch64 +4

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Migration Toolkit for Containers	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Hardened Images	Fixed	RHSA-2026:42125

Not affected: 3 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2026-57053
2026-10-03 Alias added: GHSA-xpv7-vm32-p7wv

References

Exploit 1

https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html

Other 1

https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html

TI-2016-05364 idn in libidn before 1.33 might allow remote attackers to obtain sensitive memory… CVSS 3.0HIGH 7.5
TI-2015-07361 idn in GNU libidn before 1.33 might allow remote attackers to obtain sensitive memory… CVSS 3.0HIGH 7.5
TI-2016-05365 The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows… CVSS 3.0HIGH 7.5
TI-2016-05363 The idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows… CVSS 3.0HIGH 7.5
TI-2015-01846 The stringprep_utf8_to_ucs4 function in libin before 1.31, as used in jabberd2, allows… CVSS 2.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences