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CVE-2026-93850VulnerabilityPublished

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to bind the volume

Source GCVE Database

0
Authoritative record:CVE-2026-93850· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 26 Oct 2026, 16:35 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
MattermostMattermostAffected
  • >=11.9.0 <=11.9.1
  • >=11.8.0 <=11.8.5
  • >=11.7.0 <=11.7.10
  • >=11.10.0 <=11.10.1
Fixed in–

AI-suggested

Until a fix is available, restrict PDF uploads to trusted users or implement resource usage limits on PDF processing if possible.

Description

Mattermost versions 11.9.x up to 11.9.1, 11.8.x up to 11.8.5, 11.7.x up to 11.7.10, and 11.10.x up to 11.10.1 contain a vulnerability where the application fails to properly bind the volume of text extracted from an uploaded PDF. This flaw allows an authenticated user to cause a denial of service by uploading a crafted PDF whose compressed content stream expands into a very large amount of text, exhausting server memory.

References

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