CVE-2026-122054 BIG-HKSCS decoding hang on crafted input
Medium 5.9
Published
Updated
Check this codebase for CVE-2026-122054 and fix it if it is affected.
What it is: CVE-2026-122054 is a medium-severity vulnerability in The GNU C Library glibc, published on 4 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-122054 in the wild and no public exploit code.
Affected product: The GNU C Library glibc. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-122054/ (Markdown: https://insights.sbomify.com/CVE-2026-122054/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-122054?
CVE-2026-122054 is a medium-severity vulnerability in The GNU C Library glibc, published on 4 Nov 2026.
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.
Weakness: CWE-835
Which versions are affected by CVE-2026-122054?
How do I fix CVE-2026-122054?
Upgrade to a fixed version.
Is CVE-2026-122054 being exploited?
There is no known exploitation of CVE-2026-122054 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-122054, GHSA-5wwm-g25c-cpx8, UBUNTU-CVE-2026-122054.