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Vulnerability · Published May 4, 2026 · Assigned by VulDB

CVE-2026-7724PrefectHQ prefect Webhook/Notification validate_restricted_url toctou

Medium 5.0

In plain English

A medium-severity race condition in prefect from PrefectHQ. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.2%top 83.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIprefect3.6.28.dev2GHSA-p3pq-hxmr-vqqr
PyPIprefect3.6.28.dev2PYSEC-2026-2959

Affected products (as reported)

VendorProductVersions
PrefectHQ prefect 3.6.28.dev1

Weakness: CWE-367, CWE-362 · 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

References