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GHSA-46wh-3698-f2cx

HighCVSS 7.8 / 10
Published Mar 29, 2026·Last modified Apr 7, 2026
Affected Components(0)

No affected components available

Description

Summary

There is a potential vulnerability in Traefik due to its dependency on an affected version of gRPC-Go (CVE-2026-33186).

A remote, unauthenticated attacker can send gRPC requests with a malformed HTTP/2 :path pseudo-header omitting the mandatory leading slash (e.g., Service/Method instead of /Service/Method). While the server routes such requests correctly, path-based authorization interceptors evaluate the raw non-canonical path and fail to match "deny" rules, allowing the request to bypass the policy entirely if a fallback "allow" rule is present.

Patches

  • https://github.com/traefik/traefik/releases/tag/v2.11.42
  • https://github.com/traefik/traefik/releases/tag/v3.6.12
  • https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3

For more information

If there are any questions or comments about this advisory, please open an issue.

<details> <summary>Original Description</summary>

Summary

This CVE hits traefik until Version 3.6.11 and 2.11.41. gRPC-Go has an authorization bypass via missing leading slash in :path

Details

As described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3

PoC

Update library version in https://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108

Impact

Is described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3

</details>
Risk Scores
Base Score
7.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
4.7

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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