Quick answers
- Is CVE-2026-116516 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116516 being exploited in the wild.
- How severe is CVE-2026-116516?
- Medium severity, with a CVSS score of 6.5, published 26 October 2026.
- Which products and versions are affected?
- Mattermost Agents plugin versions 11.1.9, 11.5.8, 11.9, 11.10.7.0 and earlier.
- Is there a fix for CVE-2026-116516?
- 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-2026-116516 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-116516?
- Check whether you run Mattermost Agents plugin 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 exists in the Zoom chat line processing logic of the Agents plugin, where insufficient validation of chat line length before string slicing operations allows an out-of-bounds or malformed data condition. An authenticated attacker can trigger a denial of service by initiating a summarization operation on a Zoom transcription containing specially crafted short continuation lines, causing the plugin process to crash.
Affected products
- Mattermost Agents plugin versions 11.1.9, 11.5.8, 11.9, 11.10.7.0 and earlier
Timeline
- 2026-10-26: disclosed