CVE-2026-33621: PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser

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MEDIUM 4.8REMOTEUPGRADE

CVE-2026-33621 is a medium-severity flaw (CVSS 4.8) affecting pinchtab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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`, a fully implemented `RateLimitMiddleware` existed in `internal/handlers/middleware.go` but was not inserted into the production HTTP handler chain, so requests were not subject to the intended per-IP throttle.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-290, CWE-770
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pinchtab

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 21:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

pinchtab pinchtab UPGRADE

Affected: >= 0.7.7 and < 0.8.5

Fixed in: 0.8.5

Safe to downgrade to: a release before 0.7.7

1. Check installed version

apt-cache policy pinchtab || rpm -q pinchtab || pinchtab --version

2. UPGRADE to 0.8.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pinchtab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pinchtab

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.7.7 (Debian / Ubuntu)

apt-cache madison pinchtab sudo apt install pinchtab=<VERSION_BEFORE_0.7.7> sudo apt-mark hold pinchtab

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pinchtab sudo dnf downgrade pinchtab-<VERSION_BEFORE_0.7.7> sudo dnf versionlock add pinchtab

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-33621?

pinchtab: upgrade to 0.8.5. Exact commands for each OS are on this page.

Is CVE-2026-33621 being exploited?

CVE-2026-33621 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-2026-33621 affect?

CVE-2026-33621 affects pinchtab. Severity is medium (CVSS 4.8). 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`,

How urgent is CVE-2026-33621?

Priority 33/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Google Chrome vulnerabilities

Related CVEs

CVE-2026-33623 MEDIUM 6.7 UPGRADE PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser
CVE-2026-33622 HIGH 8.8 UPGRADE PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser
CVE-2026-33620 MEDIUM 4.3 UPGRADE PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser
CVE-2026-33619 MEDIUM 4.1 UPGRADE PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser
CVE-2026-33081 MEDIUM 5.8 UPGRADE PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser

References

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