CVE-2026-27882

Coolify: Timing Attack in GitLab Webhook Token Validation

State: Published
Severity: 4.8 Medium
Published: Jun 30, 2026
Updated: Jun 30, 2026
Reserved: Feb 24, 2026

Description

Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.461, the GitLab webhook endpoint uses a non-constant-time string comparison operator (!==) to validate the webhook secret token. This implementation is vulnerable to timing attacks, which could allow an attacker to gradually discover the secret token by measuring response time differences. This vulnerability is fixed in 4.0.0-beta.461.

Scores

CVSS	Score	Vector	Source
3.1	4.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
coolifycoollabsio	< 4.0.0-beta.461Affected

References

https://github.com/coollabsio/coolify/security/advisories/GHSA-x525-46rq-mr8c

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