CVE-2026-122054

MEDIUM 5.9

BIG-HKSCS decoding hang on crafted input

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.18 through 2.31 may result in the converter making no progress, causing the calling application to hang.

CWE	CWE-835
Vendor	the gnu c library
Product	glibc
Published	Nov 4, 2026
Last Updated	Nov 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

The GNU C Library / glibc

2.18 ≤ 2.31

References

NVD ↗ CVE.org ↗ EPSS Data ↗

sourceware.org: https://sourceware.org/bugzilla/show_bug.cgi?id=25734 sourceware.org: https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0026 openwall.com: http://www.openwall.com/lists/oss-security/2026/11/04/10

Credits

🔍 Tom Honermann