Denial of service via crafted TIFF file upload
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 11.6.1, 11.5.4, 11.4.5, 10.11.15, 10.11.15+incompatible, and 3 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.2, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate the TIFF IFD offset in the image header before allocating memory, which allows authenticated users with file upload or posting permissions to cause a denial of service (server OOM) via uploading a crafted TIFF file or posting a URL that serves one.. Mattermost Advisory ID: MMSA-2026-00648
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 11.6.0 · through 11.6.0; From 11.5.0 · through 11.5.2; From 11.5.0 · through 11.5.3; From 11.4.0 · through 11.4.4; From 10.11.0 · through 10.11.14
- github.com/mattermost/mattermost-serverGo
From 11.6.0 · fixed in 11.6.1
- github.com/mattermost/mattermost-serverGo
From 11.5.0 · fixed in 11.5.4
- github.com/mattermost/mattermost-serverGo
From 11.4.0 · fixed in 11.4.5
- github.com/mattermost/mattermost-serverGo
From 10.11.0 · fixed in 10.11.15
- github.com/mattermost/mattermost-serverGo
From 10.11.0+incompatible · fixed in 10.11.15+incompatible; From 11.4.0+incompatible · fixed in 11.4.5+incompatible; From 11.5.0+incompatible · fixed in 11.5.4+incompatible; From 11.6.0+incompatible · fixed in 11.6.1+incompatible