PrefectHQ prefect Webhook/Notification validate_restricted_url toctou
Published May 4, 2026
2.3
LOWCVSS 4.0
EPSS 0.31%
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 products
-
- Version 3.6.28.dev1StatusaffectedConstraints-
- Version 3.6.28.dev2StatusunaffectedConstraints-
- Version
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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:P
2 other sources (CVE.org, NVD) ▾
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:P
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:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
1 other source (CVE.org) ▾
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
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
AV:N/AC:H/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C
1 other source (NVD) ▾
AV:N/AC:H/Au:S/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 5, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
May-Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.31% (0.00309) | 21.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.25% (0.00250) | 16.00th | v5 (v2026.06.15) |
| May 4, 2026 | 0.07% (0.00066) | 20.06th | v4 (v2025.03.14) |
References (11)
- https://gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a exploit
- https://github.com/PrefectHQ/prefect product
- https://github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed patch
- https://github.com/PrefectHQ/prefect/pull/21591 issue-trackingpatch
- https://github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 patch
- https://github.com/advisories/GHSA-p3pq-hxmr-vqqr Advisory
- https://linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url issue-tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-7724
- https://vuldb.com/submit/807303 third-party-advisory
- https://vuldb.com/vuln/360900 vdb-entrytechnical-description
- https://vuldb.com/vuln/360900/cti signaturepermissions-required
| Link | Providers | Tags |
|---|---|---|
| https://gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a | exploit | |
| https://github.com/PrefectHQ/prefect | product | |
| https://github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed | patch | |
| https://github.com/PrefectHQ/prefect/pull/21591 | issue-trackingpatch | |
| https://github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2 | patch | |
| https://github.com/advisories/GHSA-p3pq-hxmr-vqqr | Advisory | |
| https://linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url | issue-tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-7724 | ||
| https://vuldb.com/submit/807303 | third-party-advisory | |
| https://vuldb.com/vuln/360900 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/360900/cti | signaturepermissions-required |
Change history (0)
No recorded changes yet.