Volcano: Webhook server vulnerable to OOM due to unbounded HTTP request body size

published 2026-05-08 6 mo ago modified 2026-06-25 4 mo ago also GHSA-8wxp-xxp2-rcgx , GO-2026-5269 , EUVD-2026-32666

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 1

go volcano.sh/volcano 1.12.4, 1.13.3, 1.14.2
linuxfoundation volcano 1.12.4, 1.13.3, 1.14.2

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-30)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD	3.1	7.4	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
GitHub	3.1	6.8	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
go	volcano.sh/volcano	<1.12.4 >=1.13.0, <1.13.3 >=1.14.0, <1.14.2	1.12.4 1.13.3 1.14.2

Affected products

volcano-sh volcano

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

References

github.com /volcano-sh/volcano/security/advisories/GHSA-8wxp-xxp2-rcgx
web, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-44247
advisory
github.com /volcano-sh/volcano
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary