CVE-2026-7724

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.

PUBLISHED Reserved 2026-05-03 | Published 2026-05-04 | Updated 2026-05-05 | Assigner VulDB

Problem types

Time-of-check Time-of-use

Race Condition

Product status

Timeline

Credits

nedlir (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/360900 (VDB-360900 | PrefectHQ prefect Webhook/Notification validate_restricted_url toctou) vdb-entry technical-description

vuldb.com/vuln/360900/cti (VDB-360900 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/807303 (Submit #807303 | PerfectHQ Perfect >=3.6.26 Time-of-check Time-of-use) third-party-advisory

linear.app/...nding-toctou-bypass-in-validate-restricted-url issue-tracking

github.com/PrefectHQ/prefect/pull/21591 issue-tracking patch

gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a exploit

github.com/...ommit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed patch

github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 patch

github.com/PrefectHQ/prefect/ product

cve.org (CVE-2026-7724)

nvd.nist.gov (CVE-2026-7724)

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