{"items":[{"id":"NVI-00006018","kind":"vulnerability","title":"robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-c4cc-x928-vjw9","CVE-2025-66578"],"plain_summary":"OSV carries this publisher advisory for robrichards/xmlseclibs. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 3.1.4 for robrichards/xmlseclibs. Confirm the publisher’s latest guidance.","source_ids":["sr-a47ee6f1416a5183b98189779eb15027"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0cd5fb020f0bb3ecade2048f1d758513"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-07T20:10:01.970Z","value":"6 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-5a1cf766280e8fb1be42fe9bd1438953"},{"kind":"CVSS","as_of":"2026-10-07T20:10:01.970Z","value":"7.5 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-5a1cf766280e8fb1be42fe9bd1438953"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.242%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.15371. Missing scores are unknown.","source_id":"sr-0cd5fb020f0bb3ecade2048f1d758513"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-a47ee6f1416a5183b98189779eb15027","url":"https://github.com/advisories/GHSA-c4cc-x928-vjw9","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-c4cc-x928-vjw9","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.694Z"},{"id":"sr-5a1cf766280e8fb1be42fe9bd1438953","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66578","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2025-66578","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T01:40:29.811Z"},{"id":"sr-0cd5fb020f0bb3ecade2048f1d758513","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2025-66578","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.373Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-a47ee6f1416a5183b98189779eb15027"],"technology":"robrichards/xmlseclibs","known_exclusions":[],"conditions_summary":"### Summary\nAn authentication bypass vulnerability exists due to a flaw in the libxml2 canonicalization process, which is used by xmlseclibs during document transformation. This weakness allows an attacker to generate a valid signature once and reuse it indefinitely. In practice, a signature created during a previous interaction - or through a misconfigured authentication flow - can be replayed to bypass authentication checks.\n\n### Details\nWhen libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. xmlseclibs then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded.\n\nhttps://github.com/robrichards/xmlseclibs/blob/f4131320c6dcd460f1b0c67f16f8bf24ce4b5c3e/src/XMLSecurityDSig.php#L296\n\n### Impact\nDigest bypass: By crafting input that causes canonicalization to yield an empty string, the attacker can manipulate validation to pass incorrectly.\n\nSignature replay on empty canonical form: If an empty string has been signed once (e.g., in a prior interaction or via a misconfigure","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 3.1.4"]}],"null_published_at":"2026-11-02T20:21:10.268Z","source_updated_at":"2025-12-09T19:52:24.819Z","source_disclosed_at":"2025-12-08T17:57:33.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:10.694Z"},{"id":"NVI-00006018","kind":"vulnerability","title":"robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-c4cc-x928-vjw9","CVE-2025-66578"],"plain_summary":"OSV carries this publisher advisory for robrichards/xmlseclibs. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 3.1.4 for robrichards/xmlseclibs. Confirm the publisher’s latest guidance.","source_ids":["sr-a47ee6f1416a5183b98189779eb15027"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0cd5fb020f0bb3ecade2048f1d758513"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.242%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.15371. Missing scores are unknown.","source_id":"sr-0cd5fb020f0bb3ecade2048f1d758513"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-a47ee6f1416a5183b98189779eb15027","url":"https://github.com/advisories/GHSA-c4cc-x928-vjw9","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-c4cc-x928-vjw9","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.694Z"},{"id":"sr-0cd5fb020f0bb3ecade2048f1d758513","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2025-66578","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.373Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-a47ee6f1416a5183b98189779eb15027"],"technology":"robrichards/xmlseclibs","known_exclusions":[],"conditions_summary":"### Summary\nAn authentication bypass vulnerability exists due to a flaw in the libxml2 canonicalization process, which is used by xmlseclibs during document transformation. This weakness allows an attacker to generate a valid signature once and reuse it indefinitely. In practice, a signature created during a previous interaction - or through a misconfigured authentication flow - can be replayed to bypass authentication checks.\n\n### Details\nWhen libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. xmlseclibs then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded.\n\nhttps://github.com/robrichards/xmlseclibs/blob/f4131320c6dcd460f1b0c67f16f8bf24ce4b5c3e/src/XMLSecurityDSig.php#L296\n\n### Impact\nDigest bypass: By crafting input that causes canonicalization to yield an empty string, the attacker can manipulate validation to pass incorrectly.\n\nSignature replay on empty canonical form: If an empty string has been signed once (e.g., in a prior interaction or via a misconfigure","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 3.1.4"]}],"null_published_at":"2026-10-31T22:13:44.232Z","source_updated_at":"2025-12-09T19:52:24.819Z","source_disclosed_at":"2025-12-08T17:57:33.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:10.694Z"}],"next_cursor":null,"snapshot_revision":"42594"}