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

Date Jun 30, 2026
Type Vendor advisory
Signal High-risk advisory
Vendor / Product Go ยท github.com/fission/fission
CVE CVE-2026-49821
High-risk advisory CVE-2026-49821

Summary

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

Why it matters

GitHub has published a reviewed security advisory for github.com/fission/fission. Prioritize it with other application dependency updates, especially because EPSS places it in the 14% percentile.

Operator check

Check whether github.com/fission/fission is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.2%; percentile: 14%.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.