CVE-2022-1337
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe image proxy component in Mattermost versions 6.4.1 and earlier allocates memory for multiple copies of a proxied image in memory, allowing an authenticated attacker to exhaust server memory and cause a denial of service by supplying links to very large image files.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 5.37.0, < 5.37.9>= 6.2.0, < 6.2.5>= 6.3.0, < 6.3.5>= 6.4.0, < 6.4.2CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Mattermost Server versionRun `mattermost version` or check the server diagnostics/logs for the version string. Alternatively, inspect the binary or package version on the server.Affected if The installed version falls within any of these ranges: 5.37.0 to 5.37.8, 6.2.0 to 6.2.4, 6.3.0 to 6.3.4, or 6.4.0 to 6.4.1.
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Verify if image proxy component is enabledInspect the Mattermost configuration file (config.json) for the 'ImageProxy' setting, or check via the system console under 'Environment > Image Proxy'. Look for entries like 'enable' set to true.Affected if The image proxy is enabled (enable=true or a similar configuration option is turned on).
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Confirm image proxy is exposed to authenticated usersReview user role permissions and the image proxy endpoint accessibility. Check if untrusted or standard users can access the image proxy functionality.Affected if Authenticated users (including non-admin users) have access to the image proxy endpoint without additional restrictions.
You are affected if your Mattermost Server version is in the vulnerable range AND the image proxy component is enabled and accessible to authenticated users.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped5.37.96.2.56.3.5
Upgrade to Mattermost version 6.4.2 or later. As a workaround, consider implementing rate limiting on the image proxy endpoint or restricting image proxy access for untrusted users.
5.37.9, 6.2.5, 6.3.5, or 6.4.2 (or latest stable in respective major branch)
- Identify your current Mattermost Server version by checking the system console or running 'mattermost version'
- Review the upgrade path matrix to determine the appropriate target version based on your current major version
- Schedule a maintenance window as upgrades require server downtime
- Back up your Mattermost database and configuration files
- For version 5.37.x: Upgrade to 5.37.9 or later
- For version 6.2.x: Upgrade to 6.2.5 or later
- For version 6.3.x: Upgrade to 6.3.5 or later
- For version 6.4.x: Upgrade to 6.4.2 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-1337 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-1337 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data