GHSA-m6m5-pp4g-fcc8 — maddy
HIGHGHSA-m6m5-pp4g-fcc8 is a high-severity (CVSS 7.5) vulnerability in github.com/foxcpp/maddy. A fix is available for github.com/foxcpp/maddy — see the affected versions and patch details below.
S3 storage write is not aborted on errors leading to unbounded memory usage
Real-World Exposure
github.com/foxcpp/maddyReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
Anyone using storage.blob.s3 introduced in 0.5.0 with storage.imapsql.
storage.imapsql local_mailboxes {
...
msg_store s3 {
...
}
}
Patches
The relevant commit is pushed to master and will be included in the 0.5.1 release.
No special handling of the issue has been done due to the small amount of affected users.
Workarounds
None.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/foxcpp/maddy | all versions | 0.5.1go get github.com/foxcpp/maddy@v0.5.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/foxcpp/maddy, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/foxcpp/maddy to 0.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-m6m5-pp4g-fcc8 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-m6m5-pp4g-fcc8 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-m6m5-pp4g-fcc8. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-m6m5-pp4g-fcc8 in your dependencies?
O3 Security finds GHSA-m6m5-pp4g-fcc8 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.