# CVE-2026-49822: Fission cross-namespace event leakage in KubernetesWatchTrigger

Source: https://junglewise.ai/threats/cve-2026-49822-fission-cross-namespace-event-leakage-in-kuberneteswatchtrigger  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-10. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-49822 · Severity: high · CVSS 7.7 · Published 2026-06-10

Fission is a serverless framework for Kubernetes. A vulnerability in its event-triggering system allowed low-privileged users to monitor activity across the entire cluster, including sensitive information about applications running in other users' private areas. This could lead to the exposure of internal operational data and persistent surveillance of other tenants' activities.

Technologies: [Fission](https://junglewise.ai/threats/technologies/fission), [github.com/fission/fission (Go)](https://junglewise.ai/threats/technologies/github-com-fission-fission). Vendors: [Fission](https://junglewise.ai/threats/vendors/fission), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-49822 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49822 being exploited in the wild.

**How severe is CVE-2026-49822?** High severity, with a CVSS score of 7.7, published 10 June 2026.

**Which products and versions are affected?** Fission <= 1.23.0; github.com/fission/fission (Go) <= 1.23.0, SEMVER:introduced=0,fixed=1.24.0.

**Is there a fix for CVE-2026-49822?** Yes. github.com/fission/fission (Go): upgrade to 1.24.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49822 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-49822?** Check whether you run Fission or github.com/fission/fission (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/fission/fission (Go): upgrade to 1.24.0 or later

  ```sh
  go get github.com/fission/fission@v1.24.0
  ```


## Technical details

A vulnerability in Fission's KubernetesWatchTrigger (KWT) allows for cross-namespace event leakage due to improper validation and authorization checks. Specifically, 'pkg/kubewatcher/kubewatcher.go' used user-controlled namespace specifications without verifying them against the trigger's own namespace, while the validating webhook only monitored 'create' operations, allowing 'update' or 'patch' requests to bypass security checks. Additionally, an empty namespace field defaulted to watching all namespaces. An attacker with low privileges can exploit this to receive full JSON event payloads for Pods, Services, and Jobs cluster-wide. The issue is fixed in version 1.24.0 by extending webhook validation to update/patch operations and enforcing namespace parity.

## Affected products

- fission fission <= 1.23.0

## Identifiers

- CVE-2026-49822
- GHSA-gc3j-79f2-7vvw
- GO-2026-5854

## Timeline

- 2026-05-26: disclosed
- 2026-06-10: advisory: NVD publication
- 2026-06-30: patched: GitHub Advisory published/reviewed

## References

- [https://api.github.com/users/j311yl0v3u](https://api.github.com/users/j311yl0v3u)
- [https://github.com/j311yl0v3u](https://github.com/j311yl0v3u)
- [https://api.github.com/users/j311yl0v3u/gists%7B/gist_id%7D](https://api.github.com/users/j311yl0v3u/gists%7B/gist_id%7D)
- [https://api.github.com/users/j311yl0v3u/repos](https://api.github.com/users/j311yl0v3u/repos)
- [https://avatars.githubusercontent.com/u/102125416?v=4](https://avatars.githubusercontent.com/u/102125416?v=4)
- [https://api.github.com/users/j311yl0v3u/events%7B/privacy%7D](https://api.github.com/users/j311yl0v3u/events%7B/privacy%7D)

## Related threats

- [GO-2026-5849 - Fission: MessageQueueTrigger scaler manager materializes Secret values into Deployment envvars and accepts arbitrary user PodSpec in github.](https://junglewise.ai/threats/go-2026-5849-fission-messagequeuetrigger-scaler-manager-materializes-509f5f41)
- [Fission privilege escalation in MessageQueueTrigger scaler manager](https://junglewise.ai/threats/fission-privilege-escalation-in-messagequeuetrigger-scaler-manager-7fe266a4)
- [Fission incomplete capability denylist in Environment and Function CRDs](https://junglewise.ai/threats/cve-2026-50570-fission-incomplete-capability-denylist-in-environment-and)
- [Fission HTTPTrigger improper input validation in RelativeURL and Prefix](https://junglewise.ai/threats/cve-2026-50569-fission-httptrigger-improper-input-validation-in-relativeurl-and)
- [Fission path traversal in SanitizeFilePath utility](https://junglewise.ai/threats/cve-2026-50568-fission-path-traversal-in-sanitizefilepath-utility)