gittuf: Invalid intermediate policies trusted when the policy apply workflow is bypassed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128036
StatePUBLISHED
AssignerAkrites
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 16:18:58 UTC
Updated2026-11-13 16:18:59 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 2.3 LOW from 7fefd608-56a6-419f-a002-fd8543c0710a

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-863 | CWE-863 CWE-863 Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.17fefd608-56a6-419f-a002-fd8543c0710aSecondary2.3LOWCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
3.1CNACVSS2.3LOWCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gittuf Gittuf affected 0.4.0 0.17.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/gittuf/gittuf/releases/tag/v0.17.0 7fefd608-56a6-419f-a002-fd8543c0710a github.com
github.com/gittuf/gittuf/security/advisories/GHSA-774m-m728-236h 7fefd608-56a6-419f-a002-fd8543c0710a github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to gittuf 0.17.0 or later, then run gittuf verify-ref over the full history of each protected reference. If an intermediate policy is invalid, verification stops with an error; review the reference state log and repository audit logs to find out whether a user with write access tampered with the policy.

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