UBUNTU-CVE-2026-44309

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Source

https://ubuntu.com/security/CVE-2026-44309

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44309.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-44309

Upstream

CVE-2026-44309

Published

2026-05-15T17:16:00Z

Modified

2026-05-20T22:03:08.352076004Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.

References

Affected packages

Ubuntu:25.10 / gitsign

Package

Name: gitsign
Purl: pkg:deb/ubuntu/gitsign?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.12.0-4

0.13.0-1

0.13.0-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gitsign",
            "binary_version": "0.13.0-2"
        },
        {
            "binary_name": "golang-github-sigstore-gitsign-dev",
            "binary_version": "0.13.0-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44309.json"

Ubuntu:26.04:LTS / gitsign