PatchTheCVECVE-2024-21491: Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the veri
CVE-2024-21491 is a medium-severity flaw (CVSS 5.9) affecting svix-webhooks. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the verify function where signatures of different lengths are incorrectly compared. An attacker can bypass signature verification by providing a shorter signature that matches the beginning of the actual signature. **Note:** The attacker would need to know a victim uses the Rust library for verification,no easy way to automatically check that;
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-21491?
svix-webhooks: upgrade to 1.17.0. Exact commands for each OS are on this page.
Is CVE-2024-21491 being exploited?
CVE-2024-21491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-21491 affect?
CVE-2024-21491 affects svix-webhooks. Severity is medium (CVSS 5.9). Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the verify function where signatures of different lengths are incorrectly compared. An attacker can bypass signature verification by provi
How urgent is CVE-2024-21491?
Priority 29/100. No elevated risk signals yet.