PatchTheCVECVE-2026-122054: Converting crafted BIG-HKSCS input to UCS-4 or the internal wide character encoding, for example with iconv, i
CVE-2026-122054 is a medium-severity flaw (CVSS 5.9) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | n/a |
| CISA exploited list | No |
| Weakness | CWE-835 |
| Published | 2026-11-04 |
| Last modified | 2026-11-04 |
Last updated 2026-11-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- Vulners Bulletins: CVE-2026-122054 2026-11-04
- Vulners Bulletins: CVE-2026-122054 BIG-HKSCS decoding hang on crafted input 2026-11-04
- Vulners Bulletins: CVE-2026-122054 BIG-HKSCS decoding hang on crafted input 2026-11-04
- VulDB Recent Entries: CVE-2026-122054 | GNU glibc up to 2.31 iconv resource consumption 2026-11-04
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-122054?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-122054 being exploited?
CVE-2026-122054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-122054 affect?
CVE-2026-122054 affects affected software. Severity is medium (CVSS 5.9). 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 h
How urgent is CVE-2026-122054?
Priority 26/100. Remotely exploitable, no login, no user action