Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M

CVE-2026-49823Fission: Cross-namespace Package read via unvalidated PackageRef in Function admission webhook

High 7.7

In plain English

A high-severity improper access control 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 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.3%top 81.5% 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, a Fission Function spec carries three reference types — Secret, ConfigMap, and Package. The first two were namespace-validated by the admission webhook; PackageRef.Namespace was not. 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-3r8v-2xmj-5c39
Go	github.com/fission/fission	1.24.0	GO-2026-5846

Affected products (as reported)

Vendor	Product	Versions
fission	fission	< 1.24.0

Weakness: CWE-284, CWE-863 · 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-3r8v-2xmj-5c39 x_refsource_CONFIRM
https://github.com/fission/fission/pull/3389 x_refsource_MISC
https://github.com/fission/fission/releases/tag/v1.24.0 x_refsource_MISC