CVE-2026-33081 PinchTab has Blind SSRF via browser-side redirect bypass in /download URL validation
Attackers can force the PinchTab server to access internal network resources via blind SSRF if download functionality is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33081?
CVE-2026-33081 is a medium-severity server-side request forgery vulnerability in pinchtab, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PinchTab is a standalone HTTP server that gives AI agents direct control over a Chrome browser. Versions 0.8.2 and below have a Blind SSRF vulnerability in the /download endpoint. The validateDownloadURL() function only checks the initial user-supplied URL, but the embedded Chromium browser can follow attacker-controlled redirects/navigations to internal network addresses after validation. Exploitation requires security.allowDownload=true (disabled by default), limiting real-world impact. An attacker-controlled page can use JavaScript redirects or resource requests to make the browser reach internal services from the PinchTab host, resulting in a blind Server-Side Request Forgery (SSRF) condition against internal-only services. The issue has been patched in version 0.8.3.
Weakness: CWE-918
Which versions are affected by CVE-2026-33081?
3 open source packages ship an affected version, including github.com/pinchtab/pinchtab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/pinchtab/pinchtab Go | All versions | 0.8.3 |
github.com/pinchtab/pinchtab Go | All versions | 0.8.3 |
github.com/pinchtab/pinchtab Go | All versions | 0.8.3 |
Products include Pinchtab Pinchtab.
How do I fix CVE-2026-33081?
Upgrade github.com/pinchtab/pinchtab to 0.8.3 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-33081 being exploited?
There is no known exploitation of CVE-2026-33081 in the wild and no public exploit code.
Other vulnerabilities in pinchtab
- CVE-2026-30834 PinchTab: SSRF with Full Response Exfiltration via Download Handler
- CVE-2026-33623 PinchTab: OS Command Injection via Profile Name in Windows Cleanup Routine Enables Arbitrary Command Execution
- CVE-2026-33622 A PinchTab Security Policy Bypass in /wait Allows Arbitrary JavaScript Execution
- CVE-2026-33621 PinchTab: Unapplied Rate Limiting Middleware Allows Unbounded Brute-Force of API Token
- CVE-2026-33620 PinchTab: API Bearer Token Exposed in URL Query Parameter via Server Logs and Intermediary Systems
Sources
Also known as GHSA-qwxp-6qf9-wr4m, GO-2026-4748.