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zizmor: Debug logging prints available GitHub credentials in cleartext

CVE-2026-102289

Summary zizmor 1.27.0 exposes GitHub access tokens in cleartext when debug-level logging is enabled. Tokens supplied via environment variables (GHTOKEN, GITHUBTOKEN, ZIZMORGITHUBTOKEN), or the corresponding command-line options (--gh-token, --github-token, --zizmor-github-token) are included in the debug representation of the parsed application configuration and written to stderr. The affected logging is enabled by a single -v/--verbose or an applicable RUSTLOG directive. Details The issue was introduced in commit [919bea46](https://github.com/zizmorcore/zizmor/commit/919bea4635bae204d5186e5743cb263c70b518b4), merged through [PR #2180](https://github.com/zizmorcore/zizmor/pull/2180). Version 1.26.1 and earlier are unaffected. Version 1.27.0 is the first and only affected release. zizmor accepts GitHub credentials to perform authenticated GitHub API requests for the purposes of retrieving remote GitHub repositories and performing online audits that may require resolving information such as action references, commits, or repository metadata. A GitHub credential is used to avoid unauthenticated API limits and, when applicable, provide access to private repositories. PR #2180 was…

Assessment

CVSS
7 (v4.0)
Severity
High
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
9 November 2026
Last updated
9 November 2026
Affected
zizmor
Weakness
CWE-532

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H

At the source

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