OOM DoS in Mattermost image proxy
Priority LOW 31CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- 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.
Summary
The image proxy component in Mattermost version 6.4.1 and earlier allocates memory for multiple copies of a proxied image, which allows an authenticated attacker to crash the server via links to very large image files.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00917 60th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 6.4.2, 6.3.5, 6.2.5 +1github.com/mattermost/mattermost-server/v6 (Go): 6.4.2
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 | 6.4 to before 6.4.2; 6.3 to before 6.3.5; 6.2 to before 6.2.5; 5.37 to before 5.37.9 | 6.4.2, 6.3.5, 6.2.5, 5.37.9 | Patch available | CNA |
| — | github.com/mattermost/mattermost-server/v6 (Go) | before 6.4.2 | 6.4.2 | Patch available | GHSA-f37q-q7p2-ccfc |
- Mattermost VendorMattermost Affected 6.4 to before 6.4.2; 6.3 to before 6.3.5; 6.2 to before 6.2.5; 5.37 to before 5.37.9 Fixed in 6.4.2, 6.3.5, 6.2.5, 5.37.9 Patch available CNA
- github.com/mattermost/mattermost-server/v6 (Go) Vendor— Affected before 6.4.2 Fixed in 6.4.2 Patch available GHSA-f37q-q7p2-ccfc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 5.37.0 to before 5.37.9; 6.2.0 to before 6.2.5; 6.3.0 to before 6.3.5; 6.4.0 to before 6.4.2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 5.37.0 to before 5.37.9; 6.2.0 to before 6.2.5; 6.3.0 to before 6.3.5; 6.4.0 to before 6.4.2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 6.4.2, 6.3.5, 6.2.5, 5.37.9
- Fix · GHSA-f37q-q7p2-ccfc github.com/mattermost/mattermost-server/v6 (Go) Fixed in 6.4.2 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mattermost 5.37.9, 6.2.5 and 2 more versions
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2022-01214 Restricted custom admin role can bypass the restrictions and view the server logs and server config.json file contentsPriority LOW 21
Timeline
- 2026-10-02 Threatist record created from CVE-2022-1337
- 2026-10-03 Alias added: GHSA-f37q-q7p2-ccfc
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-2022-1337 · CVE Program
- CVE-2022-1337 · NVD
- FIRST EPSS
- GHSA-f37q-q7p2-ccfc · GitHub Advisory Database · CC BY 4.0
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