GHSA-v455-mv2v-5g92: github.com/fission/fission (CVE-2026-50563)

Fission Container Executor Function PodSpec Injection Leading to Node Escape

CVSS 9.9 CriticalCriticalEPSS 0.0027 · 20th percentile

Critical, because:

CVSS score 9.9: 9.0 or more.

Published by the GitHub Advisory Database at 30 Jun 2026, 18:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/fission/fission	Go	<1.24.0	1.24.0

Identifiers

GHSA-v455-mv2v-5g92 · CVE-2026-50563 · GO-2026-5858

Weakness (CWE)

CWE-269 · CWE-284

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Fission versions below 1.24.0 let a tenant with permission to create Functions supply a crafted pod spec for the container executor. The executor deploys it without rejecting host namespaces, host path mounts, or privileged containers, which allows escape to the underlying node. Upgrade to Fission 1.24.0 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.9	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0027, the 20th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:05 UTC First seen by agentprime
31 Oct 2026, 15:05 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.