Server-side Denial of Service while processing a specifically crafted GIF file
Priority LOW 31CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service, Code execution
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400 and CWE-434.
Summary
Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0126 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed github.com/mattermost/mattermost-server/v6 (Go): 7.2.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | up to 7.1.x | — | No fix listed | CNA |
| — | github.com/mattermost/mattermost-server/v6 (Go) | 7.1.0 to before 7.2.0 | 7.2.0 | Patch available | GHSA-m7w4-q5vg-5xfp |
- Mattermost VendorMattermost Affected up to 7.1.x Fixed in — No fix listed CNA
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected 7.1.0 to before 7.2.0 Fixed in 7.2.0 Patch available GHSA-m7w4-q5vg-5xfp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | before 7.2.0 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 7.2.0 Vulnerable ·Mattermost
Remediation
- Fix · GHSA-m7w4-q5vg-5xfp github.com/mattermost/mattermost-server/v6 (Go) Fixed in 7.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2022-3257
- 2026-10-03 Alias added: GHSA-m7w4-q5vg-5xfp
References
More Mattermost Server vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
- TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
- TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
- TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
Sources
- CVE-2022-3257 · CVE Program
- CVE-2022-3257 · NVD
- FIRST EPSS
- GHSA-m7w4-q5vg-5xfp · GitHub Advisory Database · CC BY 4.0
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