CVE-2026-128036
gittuf: Invalid intermediate policies trusted when the policy apply workflow is bypassed
Description
In gittuf 0.4.0 through 0.16.0, when a policy update appears within the range of reference state log entries being verified, verification checks only the root of trust signatures of the new policy and not the signatures of its other metadata (rule files). A user trusted to push to the repository who bypasses gittuf policy apply and writes the policy reference and reference state log directly can make an invalid policy apply during verification, weakening or strengthening the rules for later changes. The update is still recorded in the reference state log.
INFO
Published Date :
Nov. 13, 2026, 4:18 p.m.
Last Modified :
Nov. 13, 2026, 4:18 p.m.
Remotely Exploit :
No
Source :
7fefd608-56a6-419f-a002-fd8543c0710a
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | 7fefd608-56a6-419f-a002-fd8543c0710a | ||||
| CVSS 3.1 | LOW | MITRE-CVE |
Solution
- Update gittuf to version 0.16.1 or later.
- Review policy configurations for integrity.
- Verify all policy metadata signatures manually.
- Ensure policy references are correctly updated.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-128036.
| URL | Resource |
|---|---|
| https://github.com/gittuf/gittuf/releases/tag/v0.17.0 | |
| https://github.com/gittuf/gittuf/security/advisories/GHSA-774m-m728-236h |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-128036 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-128036
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-128036 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-128036 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 7fefd608-56a6-419f-a002-fd8543c0710a
Nov. 13, 2026
Action Type Old Value New Value Added Description In gittuf 0.4.0 through 0.16.0, when a policy update appears within the range of reference state log entries being verified, verification checks only the root of trust signatures of the new policy and not the signatures of its other metadata (rule files). A user trusted to push to the repository who bypasses gittuf policy apply and writes the policy reference and reference state log directly can make an invalid policy apply during verification, weakening or strengthening the rules for later changes. The update is still recorded in the reference state log. Added CVSS V3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-863 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/128xxx/CVE-2026-128036.json">CVE-2026-128036</a> Added Reference https://github.com/gittuf/gittuf/releases/tag/v0.17.0 Added Reference https://github.com/gittuf/gittuf/security/advisories/GHSA-774m-m728-236h