Quick answers
- Is CVE-2026-115819 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115819 being exploited in the wild.
- How severe is CVE-2026-115819?
- Medium severity, with a CVSS score of 4.8, published 11 November 2026.
- Which products and versions are affected?
- Gnu C Library (glibc) 2.2 to 2.44.
- Is there a fix for CVE-2026-115819?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-115819 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-115819?
- Check whether you run Gnu C Library (glibc) 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 wide scanf family writes multibyte sequences converted from wide characters into caller-provided char arrays. When a %s or %[ conversion without the 'l' length modifier completes, the functions unconditionally append a second null byte after the terminating null already written by __wcrtomb, overflowing a buffer sized per C standard requirements. The overflow is triggered only when converted input and terminator exactly fill the destination; the overflowing byte is always null.
Affected products
- GNU C Library (glibc) 2.2 to 2.44
Timeline
- 2026-11-11: disclosed