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Medium severity4.3NVD Advisory· Published Sep 14, 2026· Updated Oct 7, 2026

CVE-2026-86349

CVE-2026-86349

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.8, 10.11.x <= 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service (CPU resource exhaustion) via a crafted post containing deeply nested blockquotes or list items.. Mattermost Advisory ID: MMSA-2026-00707

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Mattermost/Mattermostllm-fuzzy2 versions
    <=11.9.0, <=11.8.4, <=11.7.8, <=10.11.22+ 1 more
    • (no CPE)range: <=11.9.0, <=11.8.4, <=11.7.8, <=10.11.22
    • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.23

Patches

Vulnerability mechanics

References

1

News mentions

0

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