DEBIAN-CVE-2026-64655
GitHub CLI (gh) is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow flag values without escaping regex metacharacters, so a user-supplied repository or workflow name is treated as a regular expression rather than a literal string. Because GitHub permits characters such as `.` in organization, repository, and workflow path names and `.` is a regex wildcard, an attacker can register a lookalike name (for example github/artifact.attestations-workflows) that satisfies a matcher intended for a different trusted signer (github/artifact-attestations-workflows), bypassing the intended Sigstore attestation verification. Exploitation requires the attacker to create a plausible lookalike repository and produce valid attestations from it, which could undermine supply chain verification for CI/CD pipelines or policy gates that pin trust to a specific signing workflow. This issue is fixed in version 2.97.0.
DEBIAN-CVE-2026-64655
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-64655
gh
Source reference: /affected/0/package/name
- Affected versions
- 2.23.0+dfsg1-1
Source reference:
/affected/0/versions2.24.3+dfsg1-1Source reference:
/affected/0/versions2.27.0+dfsg1-1Source reference:
/affected/0/versions2.30.0-1Source reference:
/affected/0/versions2.30.0-2Source reference:
/affected/0/versions2.35.0-1Source reference:
/affected/0/versions2.40.1+dfsg1-1Source reference:
/affected/0/versions2.42.1-1Source reference:
/affected/0/versions2.43.1-1Source reference:
/affected/0/versions2.44.1-1Source reference:
/affected/0/versions2.44.1-2Source reference:
/affected/0/versions2.45.0-1Source reference:
/affected/0/versions2.46.0-1Source reference:
/affected/0/versions2.46.0-2Source reference:
/affected/0/versions2.46.0-3Source reference:
/affected/0/versions2.46.0-4Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
gh
Source reference: /affected/1/package/name
- Affected versions
- 2.46.0-3
Source reference:
/affected/1/versions2.46.0-4Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "gh",
"purl": "pkg:deb/debian/gh?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.23.0+dfsg1-1",
"2.24.3+dfsg1-1",
"2.27.0+dfsg1-1",
"2.30.0-1",
"2.30.0-2",
"2.35.0-1",
"2.40.1+dfsg1-1",
"2.42.1-1",
"2.43.1-1",
"2.44.1-1",
"2.44.1-2",
"2.45.0-1",
"2.46.0-1",
"2.46.0-2",
"2.46.0-3",
"2.46.0-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-64655.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "gh",
"purl": "pkg:deb/debian/gh?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.46.0-3",
"2.46.0-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-64655.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58265 · Revision 1
- Added to Heist Feed
- Publisher date