CVE-2026-7724: PrefectHQ prefect · Time-of-check Time-of-use
Affects PrefectHQ prefectSource CVE Database V5
Public exploit available · CVSS 2.3 Low.
Data as of 31 Oct 2026, 20:20 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:PExploitation evidence
Disclosed: evidence found.
CVE published 4 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PrefectHQprefect | Affected
| Fixed in– |
CPE configurations (1)
cpe:2.3:a:prefect:prefect:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade PrefectHQ prefect to version 3.6.28.dev2 or later, which contains the patch for this vulnerability. No other mitigations are specifically indicated.
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.
References
- vuldb.com/vuln/360900 (opens in a new tab)
- vuldb.com/vuln/360900/cti (opens in a new tab)
- vuldb.com/submit/807303 (opens in a new tab)
- linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url (opens in a new tab)
- github.com/PrefectHQ/prefect/pull/21591 (opens in a new tab)
- gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a (opens in a new tab)
- github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed (opens in a new tab)
- github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 (opens in a new tab)
- github.com/PrefectHQ/prefect/ (opens in a new tab)