CVE-2024-58259 is a high-severity (CVSS 8.2) CWE-770 vulnerability in github.com/rancher/rancher. A fix is available for github.com/rancher/rancher — see the affected versions and patch details below.
Rancher affected by unauthenticated Denial of Service
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-58259.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/rancher/rancher🐹github.com/rancher/rancher🐹github.com/rancher/rancher🐹github.com/rancher/rancher🐹github.com/rancher/rancherReal-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
A vulnerability has been identified within Rancher Manager in which it did not enforce request body size limits on certain public (unauthenticated) and authenticated API endpoints. This allows a malicious user to exploit this by sending excessively large payloads, which are fully loaded into memory during processing. This could result in:
- Denial of Service (DoS): The server process may crash or become unresponsive when memory consumption exceeds available resources.
- Unauthenticated and authenticated exploitation: While the issue was initially observed in unauthenticated
/v3-public/*endpoints, the absence of request body size limits also affected several authenticated APIs, broadening the potential attack surface. It's worth noting that other areas in Rancher do implement safeguards: requests proxied to Kubernetes APIs are subject to built-in size limits enforced by the Kubernetes API server itself, and Norman-based endpoints parse input with predefined size caps. However, the absence of similar protections in other Rancher APIs increased the risk of denial-of-service (DoS) scenarios in certain contexts.
By sending large binary or text payloads to vulnerable endpoints, a malicious actor could disrupt Rancher’s availability, impacting both administrative and user operations across managed clusters.
Please consult the associated MITRE ATT&CK - Technique - Network Denial of Service for further information about this category of attack.
Patches
This vulnerability is addressed by adding a default limit of 1MiB and a setting in case this value needs to be increased.
Patched versions of Rancher include releases v2.12.1, v2.11.5, v2.10.9 and v2.9.12.
Workarounds
If you can't upgrade to a fixed version, please make sure that you are manually setting the request body size limits. For example, using nginx-ingress controller and only allowing requests via the ingress. For reference on how to configure the limit manually, please consult the Knowledge Base.
References
If you have any questions or comments about this advisory:
- Reach out to the SUSE Rancher Security team for security related inquiries.
- Open an issue in the Rancher repository.
- Verify with our support matrix and product support lifecycle.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/rancher/rancher | ≥ 2.12.0&&< 2.12.1 | 2.12.1go get github.com/rancher/rancher@v2.12.1 |
| 🐹Go | github.com/rancher/rancher | ≥ 2.11.0&&< 2.11.5 | 2.11.5go get github.com/rancher/rancher@v2.11.5 |
| 🐹Go | github.com/rancher/rancher | ≥ 2.10.0&&< 2.10.9 | 2.10.9go get github.com/rancher/rancher@v2.10.9 |
| 🐹Go | github.com/rancher/rancher | ≥ 2.9.0&&< 2.9.11 | 2.9.11go get github.com/rancher/rancher@v2.9.11 |
| 🐹Go | github.com/rancher/rancher | all versions | 0.0.0-20250813072957-aee95d4e2a41go get github.com/rancher/rancher@v0.0.0-20250813072957-aee95d4e2a41 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/rancher/rancher, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/rancher/rancher to 2.12.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-58259 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is CVE-2024-58259 in your dependencies?
Find it across Go, including transitive dependencies.