CVE-2026-34040 — Moby: AuthZ plugin bypass with oversized request body

Affected: moby

Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.

GHSA-x744-4wpc-v9h2 — Moby has AuthZ plugin bypass when provided oversized request bodies

Affected: Go: github.com/moby/moby, Go: github.com/moby/moby/v2

## Summary

A security vulnerability has been detected that allows attackers to bypass [authorization plugins (AuthZ)](https://docs.docker.com/engine/extend/plugins_authorization/) under specific circumstances. The base likelihood of this being exploited is low.

This is an incomplete fix for [CVE-2024-41110](https://github.com/moby/moby/security/advisories/GHSA-v23v-6jw2-98fq).

## Impact

**If you don't use AuthZ plugins, you are not affected.**

Using a specially-crafted API request, an attacker could make the Docker daemon forward the request to an authorization plugin without the body. The authorization plugin may allow a request which it would have otherwise denied if the body had been forwarded to it.

Anyone who depends on authorization plugins that introspect the request body to make access control decisions is potentially impacted.

## Workarounds

If unable to update immediately: - Avoid using AuthZ plugins that rely on request body inspection for security decisions. - Restrict access to the Docker API to trusted parties, following the principle of least privilege.

## Credits

- 1seal / Oleh Konko ([@1seal](https://github.com/1seal)) - Cody (c@wormhole.guru) - Asim Viladi Oglu Manizada (@manizada)

## Resources

- [CVE-2024-41110 / GHSA-v23v-6jw2-98fq](https://github.com/moby/moby/security/advisories/GHSA-v23v-6jw2-98fq)

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CVE-2026-34040 — Moby: AuthZ plugin bypass with oversized request body

GHSA-x744-4wpc-v9h2 — Moby has AuthZ plugin bypass when provided oversized request bodies