Vulnerability · Published Nov 4, 2026 · Assigned by glibc
CVE-2026-122054BIG-HKSCS decoding hang on crafted input
Medium 5.9
In plain English
A medium-severity infinite loop in glibc from The GNU C Library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.4%top 61.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | glibc | 2.32-1 | DEBIAN-CVE-2026-122054 |
| Debian:13 | glibc | 2.32-1 | DEBIAN-CVE-2026-122054 |
| Debian:14 | glibc | 2.32-1 | DEBIAN-CVE-2026-122054 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The GNU C Library | glibc | 2.18 – through 2.31 |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H