What is CVE-2026-33621?

CVE-2026-33621 is a medium-severity vulnerability in Pinchtab, classified under Authentication Bypass by Spoofing. CVSS score: 4.8/10. Published 2026-03-26.

How severe is CVE-2026-33621?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Resource exhaustion in Pinchtab

CVE-2026-33621

PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab `v0.7.7` through `v0.8.4` contain incomplete request-throttling protections for auth-checkable endpoints. In `v0.7.7` through `v0.8.3`…

EPSS: 0.001 (25.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Pinchtab — versions >= 0.7.7, < 0.8.5

Weakness classification (CWE)

References

https://github.com/pinchtab/pinchtab/security/advisories/GHSA-j65m-hv65-r264 (x_refsource_CONFIRM)
https://github.com/pinchtab/pinchtab/commit/c619c43a4f29d1d1a481e859c193baf78e0d648b (x_refsource_MISC)
https://github.com/pinchtab/pinchtab/releases/tag/v0.8.4 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33621?: CVE-2026-33621 is a medium-severity vulnerability in Pinchtab, classified under Authentication Bypass by Spoofing. CVSS score: 4.8/10. Published 2026-03-26.
How severe is CVE-2026-33621?: Medium severity. CVSS v3 base score is 4.8 out of 10.