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Vulnerabilities

Vulnerability · CVE-2026-33621

PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser.

Published Mar 26, 2026 · catalog updated Jun 17, 2026 · PinchTab is a standalone

Check if you run it

No confirmed exploitation is on record for CVE-2026-33621. EPSS is 0.44%. Act only if a listed version of PinchTab is a standalone is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (PinchTab is a standalone).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Advisory link
Affected products
cpe pinchtab/pinchtab

PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab through contain incomplete request-throttling protections for auth-checkable endpoints. In through , a fully implemented existed in but was not inserted into the production HTTP handler chain, so requests were not subject to the intended per-IP throttle. In the same pre- range, the original limiter also keyed clients using , which would have allowed client-controlled header spoofing if the middleware had been enabled. addressed those two issues by wiring the limiter into the live handler chain and switching the key to the immediate peer IP, but it still exempted and from rate limiting even though remained an auth-checkable endpoint when a token was configured. This issue weakens defense in depth for deployments where an attacker can reach the API, especially if a weak human-chosen token is used. It is not a direct authentication bypass or token disclosure issue by itself. PinchTab is documented as local-first by default and uses plus a generated random token in the recommended setup. PinchTab's default deployment model is a local-first, user-controlled environment between the user and their agents; wider exposure is an intentional operator choice. This lowers practical risk in the default configuration, even though it does not by itself change the intrinsic base characteristics of the bug. This was fully addressed in by applying in the production handler chain, deriving the client address from the immediate peer IP instead of trusting forwarded headers by default, and removing the and exemption so auth-checkable endpoints are throttled as well.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe pinchtab/pinchtabversion unspecified

How to fix CVE-2026-33621

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33621. EPSS is 0.44%. Act only if a listed version of PinchTab is a standalone is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-290: Authentication Bypass by Spoofing; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 26, 2026 · NIST NVD

    Detected

    PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab through contain incomplete request-throttling protections for auth-checkable endpoints. In through , a fully implemented existed in but was not inserted into the production HTTP handler chain, so requests were not subject to the intended per-IP throttle. In the same pre- range, the original lim

  2. Jun 17, 2026 · NIST NVD

    Updated

    PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab through contain incomplete request-throttling protections for auth-checkable endpoints. In through , a fully implemented existed in but was not inserted into the production HTTP handler chain, so requests were not subject to the intended per-IP throttle. In the same pre- range, the original lim

Sources

  • CVE.orgVulnerability recordCVE-2026-33621

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33621

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33621

    PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. PinchTab through contain incomplete request-throttling protections for auth-checkable endpoints. In through , a fully implemented `RateLimitMiddlewar

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.