CVE-2026-7724 PrefectHQ prefect Webhook/Notification validate_restricted_url toctou
Attackers can bypass URL restrictions in Prefect webhooks via a race condition, requiring high complexity and remote access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-7724?
CVE-2026-7724 is a low-severity vulnerability in PrefectHQ prefect, published on 4 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-7724?
3 open source packages ship an affected version, including prefect.
| Package | Affected | Fixed in |
|---|---|---|
prefect PyPI | All versions | 3.6.28.dev2 |
prefect PyPI | All versions | 3.6.28.dev2 |
prefect PyPI | All versions | 3.6.28.dev2 |
How do I fix CVE-2026-7724?
Upgrade prefect to 3.6.28.dev2 or later.
Is CVE-2026-7724 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7724 exists.
Sources
Also known as GHSA-p3pq-hxmr-vqqr, PYSEC-2026-2959.