Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M

CVE-2026-49821Fission: Cross-namespace Environment reference in Package allows build-time command execution and SA token exfiltration

High 7.7

In plain English

A high-severity missing authorization in fission from fission. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.2%top 86.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/fission/fission	1.24.0	GHSA-vjhc-cf4p-72q4
Go	github.com/fission/fission	1.24.0	GO-2026-5859

Affected products (as reported)

Vendor	Product	Versions
fission	fission	< 1.24.0

Weakness: CWE-441, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

https://github.com/fission/fission/security/advisories/GHSA-vjhc-cf4p-72q4 x_refsource_CONFIRM
https://github.com/fission/fission/pull/3379 x_refsource_MISC
https://github.com/fission/fission/releases/tag/v1.24.0 x_refsource_MISC