Quick answers
- Is CVE-2026-80489 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-80489 being exploited in the wild.
- How severe is CVE-2026-80489?
- Medium severity, with a CVSS score of 5.9, published 15 September 2026.
- Which products and versions are affected?
- Gnu C Library 2.3 to 2.44.
- Is there a fix for CVE-2026-80489?
- A patch was published on 2026-08-28: Fix committed to master branch Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-80489 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-80489?
- Check whether you run Gnu C Library at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a denial-of-service (DoS) flaw in the EUC_JISX0213 character set decoder within glibc's iconv implementation. The root cause is that when a multi-codepoint EUC_JISX0213 sequence is split across buffer boundaries, the converter fails to properly clear a pending character stored in the conversion state. On the next call, it re-emits the pending character without consuming input, causing the application to retry the conversion infinitely. The attack requires attacker-controlled input and a small output buffer that splits the two-codepoint sequence. The vulnerability affects glibc versions 2.3 to 2.44; patches have been issued for versions 2.41 through 2.45.
Affected products
- GNU C Library 2.3 to 2.44
Timeline
- 2026-08-26: disclosed
- 2026-08-28: patched: Fix committed to master branch
- 2026-09-15: advisory