PYSEC-2026-2959
Vulnerability from pysec - Published: 2026-07-13 15:02 - Updated: 2026-07-13 16:05
VLAI
Details
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.
Severity
Impacted products
| Name | purl | prefect | pkg:pypi/prefect |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "prefect",
"purl": "pkg:pypi/prefect"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.28.dev2"
}
],
"type": "ECOSYSTEM"
}
],
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"3.6.27.dev3",
"3.6.27.dev4",
"3.6.27.dev5",
"3.6.28.dev1",
"3.6.3",
"3.6.3.dev1",
"3.6.3.dev2",
"3.6.3.dev3",
"3.6.4",
"3.6.4.dev1",
"3.6.5",
"3.6.5.dev1",
"3.6.5.dev2",
"3.6.5.dev3",
"3.6.5.dev4",
"3.6.6",
"3.6.7",
"3.6.7.dev3",
"3.6.8",
"3.6.8.dev3",
"3.6.9"
]
}
],
"aliases": [
"CVE-2026-7724",
"GHSA-p3pq-hxmr-vqqr"
],
"details": "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.",
"id": "PYSEC-2026-2959",
"modified": "2026-07-13T16:05:46.737888Z",
"published": "2026-07-13T15:02:56.612165Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7724"
},
{
"type": "WEB",
"url": "https://github.com/PrefectHQ/prefect/pull/21591"
},
{
"type": "WEB",
"url": "https://github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed"
},
{
"type": "WEB",
"url": "https://gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a"
},
{
"type": "PACKAGE",
"url": "https://github.com/PrefectHQ/prefect"
},
{
"type": "WEB",
"url": "https://github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2"
},
{
"type": "WEB",
"url": "https://linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url"
},
{
"type": "WEB",
"url": "https://vuldb.com/submit/807303"
},
{
"type": "WEB",
"url": "https://vuldb.com/vuln/360900"
},
{
"type": "WEB",
"url": "https://vuldb.com/vuln/360900/cti"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/prefect"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-p3pq-hxmr-vqqr"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Prefect SSRF Bypass via DNS Rebinding in validate_restricted_url"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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