{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-31830", "tracking": { "current_release_date": "2026-03-24T20:41:52.294451Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31830", "initial_release_date": "2026-03-10T22:26:23.963537Z", "revision_history": [ { "date": "2026-03-10T22:26:23.963537Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T22:26:26.267033Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-10T22:38:41.642795Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T22:38:43.579686Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-11T00:53:16.443491Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-11T06:39:55.991762Z", "number": "6", "summary": "References created (1)." }, { "date": "2026-03-11T14:54:32.058855Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-11T14:54:44.174531Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-11T16:39:37.192869Z", "number": "9", "summary": "Unknown change." }, { "date": "2026-03-13T06:40:26.823798Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (4).| Product Identifiers created (4).| Products connected (1).| References created (2).| CWES updated (1)." }, { "date": "2026-03-19T15:29:34.670016Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-19T15:29:37.894203Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:32:44.661757Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:32:46.700269Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:22:36.811348Z", "number": "15", "summary": "References created (1)." }, { "date": "2026-03-20T18:32:39.678064Z", "number": "16", "summary": "References created (1)." }, { "date": "2026-03-20T18:34:14.210535Z", "number": "17", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-20T18:34:19.076478Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-23T05:17:20.726449Z", "number": "19", "summary": "References removed (1)." }, { "date": "2026-03-24T20:41:49.745697Z", "number": "20", "summary": "References created (1)." } ], "status": "interim", "version": "20" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.1.1", "product": { "name": "vers:unknown/0.1.1", "product_id": "CSAFPID-5812456", "product_identification_helper": { "purl": "pkg:gem/sigstore@0.1.1" } } }, { "category": "product_version_range", "name": "vers:unknown/0.2.0", "product": { "name": "vers:unknown/0.2.0", "product_id": "CSAFPID-5505131", "product_identification_helper": { "purl": "pkg:gem/sigstore@0.2.0" } } }, { "category": "product_version_range", "name": "vers:unknown/0.2.1", "product": { "name": "vers:unknown/0.2.1", "product_id": "CSAFPID-5812457", "product_identification_helper": { "purl": "pkg:gem/sigstore@0.2.1" } } }, { "category": "product_version_range", "name": "vers:unknown/0.2.2", "product": { "name": "vers:unknown/0.2.2", "product_id": "CSAFPID-5812458", "product_identification_helper": { "purl": "pkg:gem/sigstore@0.2.2" } } }, { "category": "product_version_range", "name": "vers:unknown/<0.2.3", "product": { "name": "vers:unknown/<0.2.3", "product_id": "CSAFPID-5875117", "product_identification_helper": { "cpe": "cpe:2.3:a:sigstore:sigstore:*:*:*:*:*:ruby:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<0.2.3", "product": { "name": "vers:unknown/>=0|<0.2.3", "product_id": "CSAFPID-5812459" } } ], "category": "product_name", "name": "sigstore" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.2.3", "product": { "name": "vers:unknown/<0.2.3", "product_id": "CSAFPID-5779789" } } ], "category": "product_name", "name": "sigstore-ruby" } ], "category": "vendor", "name": "sigstore" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-31830", "cwe": { "id": "CWE-252", "name": "Unchecked Return Value" }, "notes": [ { "category": "description", "text": "sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31830" }, { "category": "description", "text": "sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31830" }, { "category": "description", "text": "### Summary\n\n`Sigstore::Verifier#verify` does not propagate the `VerificationFailure` returned by `verify_in_toto` when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns `VerificationSuccess` regardless of whether the artifact matches the attested subject.\n\n### Details\n\nIn `lib/sigstore/verifier.rb`, the verify method calls `verify_in_toto` (line 176) without capturing or checking its return value:\n\n`verify_in_toto(input, in_toto)`\n\nWhen `verify_in_toto` detects a digest mismatch, it returns a `VerificationFailure` object. Because the caller discards this return value, execution unconditionally falls through to return `VerificationSuccess`. This is the only verification sub-check in the method (out of 12) whose failure is not propagated.\n\nThe message_signature code path is not affected.\n\n### Impact\n\nAn attacker who possesses a valid signed DSSE bundle containing an in-toto attestation for artifact A can present it as a valid attestation for a different artifact B. All other verification checks (DSSE envelope signature, certificate chain, Rekor inclusion, SCTs, policy) pass because they are independent of the artifact content. Only the in-toto subject digest check detects the mismatch, and its result is discarded.\n\nThis allows an attacker to bypass artifact-to-attestation binding for any consumer that relies on `Sigstore::Verifier#verify` to validate DSSE/in-toto bundles.\n\n### Workarounds\n\nNone. Consumers cannot work around this without patching the library.", "title": "github - https://github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "description", "text": "### Summary\n\n`Sigstore::Verifier#verify` does not propagate the `VerificationFailure` returned by `verify_in_toto` when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns `VerificationSuccess` regardless of whether the artifact matches the attested subject.\n\n### Details\n\nIn `lib/sigstore/verifier.rb`, the verify method calls `verify_in_toto` (line 176) without capturing or checking its return value:\n\n`verify_in_toto(input, in_toto)`\n\nWhen `verify_in_toto` detects a digest mismatch, it returns a `VerificationFailure` object. Because the caller discards this return value, execution unconditionally falls through to return `VerificationSuccess`. This is the only verification sub-check in the method (out of 12) whose failure is not propagated.\n\nThe message_signature code path is not affected.\n\n### Impact\n\nAn attacker who possesses a valid signed DSSE bundle containing an in-toto attestation for artifact A can present it as a valid attestation for a different artifact B. All other verification checks (DSSE envelope signature, certificate chain, Rekor inclusion, SCTs, policy) pass because they are independent of the artifact content. Only the in-toto subject digest check detects the mismatch, and its result is discarded.\n\nThis allows an attacker to bypass artifact-to-attestation binding for any consumer that relies on `Sigstore::Verifier#verify` to validate DSSE/in-toto bundles.\n\n### Workarounds\n\nNone. Consumers cannot work around this without patching the library.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/RubyGems%2FGHSA-mhg6-2q2v-9h2c.json?alt=media" }, { "category": "description", "text": "### Summary\n\n`Sigstore::Verifier#verify` does not propagate the `VerificationFailure` returned by `verify_in_toto` when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns `VerificationSuccess` regardless of whether the artifact matches the attested subject.\n\n### Details\n\nIn `lib/sigstore/verifier.rb`, the verify method calls `verify_in_toto` (line 176) without capturing or checking its return value:\n\n`verify_in_toto(input, in_toto)`\n\nWhen `verify_in_toto` detects a digest mismatch, it returns a `VerificationFailure` object. Because the caller discards this return value, execution unconditionally falls through to return `VerificationSuccess`. This is the only verification sub-check in the method (out of 12) whose failure is not propagated.\n\nThe message_signature code path is not affected.\n\n### Impact\n\nAn attacker who possesses a valid signed DSSE bundle containing an in-toto attestation for artifact A can present it as a valid attestation for a different artifact B. All other verification checks (DSSE envelope signature, certificate chain, Rekor inclusion, SCTs, policy) pass because they are independent of the artifact content. Only the in-toto subject digest check detects the mismatch, and its result is discarded.\n\nThis allows an attacker to bypass artifact-to-attestation binding for any consumer that relies on `Sigstore::Verifier#verify` to validate DSSE/in-toto bundles.\n\n### Workarounds\n\nNone. Consumers cannot work around this without patching the library.", "title": "github - https://api.github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "description", "text": "sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31830" }, { "category": "other", "text": "0.00038", "title": "EPSS" }, { "category": "other", "text": "4.5", "title": "NCSC Score" } ], "product_status": { "known_affected": [ "CSAFPID-5779789", "CSAFPID-5505131", "CSAFPID-5812456", "CSAFPID-5812457", "CSAFPID-5812458", "CSAFPID-5812459", "CSAFPID-5875117" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31830" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31830" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31830" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31830.json" }, { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31830" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/RubyGems%2FGHSA-mhg6-2q2v-9h2c.json?alt=media" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31830" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/sigstore/sigstore-ruby/security/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-mhg6-2q2v-9h2c" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31830" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sigstore/CVE-2026-31830.yml" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5505131", "CSAFPID-5779789", "CSAFPID-5812456", "CSAFPID-5812457", "CSAFPID-5812458", "CSAFPID-5812459", "CSAFPID-5875117" ] } ], "title": "CVE-2026-31830" } ] }