{"cve":"CVE-2026-24137","nvd":{"published":"2026-01-23T00:15:52.553","modified":"2026-06-17T10:22:41.597","status":"Deferred","description":"sigstore framework is a common go library shared across sigstore services and clients. In versions 1.10.3 and below, the legacy TUF client (pkg/tuf/client.go) supports caching target files to disk. It constructs a filesystem path by joining a cache base directory with a target name sourced from signed target metadata; however, it does not validate that the resulting path stays within the cache base directory. A malicious TUF repository can trigger arbitrary file overwriting, limited to the permissions that the calling process has. Note that this should only affect clients that are directly using the TUF client in sigstore/sigstore or are using an older version of Cosign. Public Sigstore deployment users are unaffected, as TUF metadata is validated by a quorum of trusted collaborators. This issue has been fixed in version 1.10.4. As a workaround, users can disable disk caching for the legacy client by setting SIGSTORE_NO_CACHE=true in the environment, migrate to https://github.com/sigstore/sigstore-go/tree/main/pkg/tuf, or upgrade to the latest sigstore/sigstore release.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N","score":5.8},"cwes":["CWE-22"],"references":["https://github.com/sigstore/sigstore/commit/8ec410a2993ea78083aecf0e473a85453039496e","https://github.com/sigstore/sigstore/releases/tag/v1.10.4","https://github.com/sigstore/sigstore/security/advisories/GHSA-fcv2-xgw5-pqxf"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2026-24137","score":0.0039,"percentile":0.33206,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-fcv2-xgw5-pqxf","url":"https://osv.dev/vulnerability/GHSA-fcv2-xgw5-pqxf","summary":"sigstore legacy TUF client allows for arbitrary file writes with target cache path traversal","modified":"2026-09-10T03:50:32.954722117Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore","purl":"pkg:golang/github.com/sigstore/sigstore","ranges":["<1.10.4"],"fixed":["1.10.4"]}]},{"id":"GO-2026-4358","url":"https://osv.dev/vulnerability/GO-2026-4358","summary":"Sigstore legacy TUF client allows for arbitrary file writes with target cache path traversal in github.com/sigstore/sigstore","modified":"2026-02-25T20:15:11Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore","purl":"pkg:golang/github.com/sigstore/sigstore","ranges":["<1.10.4"],"fixed":["1.10.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}