CVE-2026-7724: PrefectHQ prefect Webhook/Notification validate_restricted_url toctou
Description
A vulnerability has been found in PrefectHQ prefect up to 3.6.28.dev1. Affected by this vulnerability is the function validate_restricted_url of the component Webhook/Notification. The manipulation leads to time-of-check time-of-use. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.6.28.dev2 addresses this issue. The identifier of the patch is 7c70ac54a5e101431d83b9f2681ec88d5e0021ed. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C · CWE-362, CWE-367
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
PrefectHQ: prefect
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a (opens in new tab)
- github.com/PrefectHQ/prefect/ (opens in new tab)
- github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed (opens in new tab)
- github.com/PrefectHQ/prefect/pull/21591 (opens in new tab)
- github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 (opens in new tab)
- linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-re… (opens in new tab)
- vuldb.com/submit/807303 (opens in new tab)
- vuldb.com/vuln/360900 (opens in new tab)
- vuldb.com/vuln/360900/cti (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)