# CVE-2026-44247: Volcano: Webhook server vulnerable to OOM due to unbounded HTTP request body size

> An attacker with in-cluster access can crash the Volcano webhook server by sending oversized HTTP requests, causing a denial of service.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 May 2026
- **Updated:** 30 May 2026
- **Also known as:** GHSA-8wxp-xxp2-rcgx, GO-2026-5269

## What is CVE-2026-44247?

CVE-2026-44247 is a medium-severity denial of service vulnerability in volcano-sh volcano, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Volcano is a Kubernetes-native batch scheduling system. Prior to v1.14.2, v1.13.3, and v1.12.4, the Volcano webhook server does not enforce a size limit on incoming HTTP request bodies. Any in-cluster pod that can reach the webhook endpoint may send an arbitrarily large request body, potentially causing the webhook server to be killed by OOM. All Volcano deployments with the webhook server exposed to in-cluster traffic are affected. This vulnerability is fixed in v1.14.2, v1.13.3, and v1.12.4.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-44247?

7 open source packages ship an affected version, including volcano.sh/volcano. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `volcano.sh/volcano` | Go | All versions | 1.12.4, 1.13.3, 1.14.2 |
| `volcano.sh/volcano` | Go | All versions | 1.12.4 |
| `volcano.sh/volcano` | Go | All versions | 1.12.4 |
| `volcano.sh/volcano` | Go | From 1.13.0 | 1.13.3 |
| `volcano.sh/volcano` | Go | From 1.13.0 | 1.13.3 |
| `volcano.sh/volcano` | Go | From 1.14.0 | 1.14.2 |
| `volcano.sh/volcano` | Go | From 1.14.0 | 1.14.2 |

Products: Linuxfoundation Volcano.

## How do I fix CVE-2026-44247?

Upgrade volcano.sh/volcano to a fixed version for your release line: 1.12.4, 1.13.3 or 1.14.2.

## Is CVE-2026-44247 being exploited?

There is no known exploitation of CVE-2026-44247 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44247 and fix it if it is affected.

What it is: CVE-2026-44247 is a medium-severity denial of service vulnerability in volcano-sh volcano, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-44247 in the wild and no public exploit code.

Affected packages and fixed versions:
- volcano.sh/volcano (Go): affected all versions; fixed in 1.12.4, 1.13.3, 1.14.2
- volcano.sh/volcano (Go): affected all versions; fixed in 1.12.4
- volcano.sh/volcano (Go): affected all versions; fixed in 1.12.4
- volcano.sh/volcano (Go): affected from 1.13.0; fixed in 1.13.3
- volcano.sh/volcano (Go): affected from 1.13.0; fixed in 1.13.3
- volcano.sh/volcano (Go): affected from 1.14.0; fixed in 1.14.2
- volcano.sh/volcano (Go): affected from 1.14.0; fixed in 1.14.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-44247/ (Markdown: https://insights.sbomify.com/CVE-2026-44247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44247
- OSV: https://osv.dev/vulnerability/CVE-2026-44247

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44247/
Summaries are generated and may contain mistakes; the official description above is the record.