{"items":[{"id":"NVI-00002000","kind":"vulnerability","title":"CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names","revision":4,"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-4v6x-c7xx-hw9f","CVE-2026-30838"],"plain_summary":"OSV carries this publisher advisory for league/commonmark. 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 2.8.1 for league/commonmark. Confirm the publisher’s latest guidance.","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"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-01ac28363ab529f43125b25e4cde84aa"],"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":"2026-06-17T10:33:00.337Z","value":"6.1 MEDIUM (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-c2abe13684142489902f8ab73d8552a9"},{"kind":"CVSS","as_of":"2026-06-17T10:33:00.337Z","value":"5.1 MEDIUM (4.0)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-c2abe13684142489902f8ab73d8552a9"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.245%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.15879. Missing scores are unknown.","source_id":"sr-01ac28363ab529f43125b25e4cde84aa"}],"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-07c89be3c1901428af55e638eb658a0f","url":"https://github.com/advisories/GHSA-4v6x-c7xx-hw9f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-4v6x-c7xx-hw9f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:49.673Z"},{"id":"sr-c2abe13684142489902f8ab73d8552a9","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30838","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-30838","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T01:40:56.268Z"},{"id":"sr-01ac28363ab529f43125b25e4cde84aa","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-2026-30838","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.781Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\nThe `DisallowedRawHtml` extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing `>`. For example, `` would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input.\n\nAll applications using the `DisallowedRawHtml` extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected.\n\n### Patches\n\nFixed in 2.8.1. The regex character class `[ \\/>]` was changed to `[\\s\\/>]` to match all whitespace characters that browsers accept as valid tag name terminators.\n\n### Workarounds\n\n- Set the `html_input` configuration option to `'escape'` or `'strip'` to disable all raw HTML, though this is a broader restriction than the `DisallowedRawHtml` extension provides.\n- Pass the rendered HTML through a dedicated HTML sanitizer before serving it to users (always recommended)","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.8.1"]}],"null_published_at":"2026-11-07T22:29:23.389Z","source_updated_at":"2026-03-20T21:35:35.482Z","source_disclosed_at":"2026-03-06T23:27:03.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:41:49.673Z"},{"id":"NVI-00002000","kind":"vulnerability","title":"CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4v6x-c7xx-hw9f","CVE-2026-30838"],"plain_summary":"OSV carries this publisher advisory for league/commonmark. 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 2.8.1 for league/commonmark. Confirm the publisher’s latest guidance.","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"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-01ac28363ab529f43125b25e4cde84aa"],"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":"2026-11-03T12:00:27.000Z","value":"0.245%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.15879. Missing scores are unknown.","source_id":"sr-01ac28363ab529f43125b25e4cde84aa"}],"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-07c89be3c1901428af55e638eb658a0f","url":"https://github.com/advisories/GHSA-4v6x-c7xx-hw9f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-4v6x-c7xx-hw9f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:49.673Z"},{"id":"sr-01ac28363ab529f43125b25e4cde84aa","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-2026-30838","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.781Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\nThe `DisallowedRawHtml` extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing `>`. For example, `` would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input.\n\nAll applications using the `DisallowedRawHtml` extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected.\n\n### Patches\n\nFixed in 2.8.1. The regex character class `[ \\/>]` was changed to `[\\s\\/>]` to match all whitespace characters that browsers accept as valid tag name terminators.\n\n### Workarounds\n\n- Set the `html_input` configuration option to `'escape'` or `'strip'` to disable all raw HTML, though this is a broader restriction than the `DisallowedRawHtml` extension provides.\n- Pass the rendered HTML through a dedicated HTML sanitizer before serving it to users (always recommended)","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.8.1"]}],"null_published_at":"2026-11-04T10:04:41.533Z","source_updated_at":"2026-03-20T21:35:35.482Z","source_disclosed_at":"2026-03-06T23:27:03.000Z","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":"2026-10-31T21:41:49.673Z"},{"id":"NVI-00002000","kind":"vulnerability","title":"CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4v6x-c7xx-hw9f","CVE-2026-30838"],"plain_summary":"OSV carries this publisher advisory for league/commonmark. 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 2.8.1 for league/commonmark. Confirm the publisher’s latest guidance.","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"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-615a2ed6eab72bb7ac2101b7de80430e"],"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":"0.226%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.133. Missing scores are unknown.","source_id":"sr-615a2ed6eab72bb7ac2101b7de80430e"}],"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-07c89be3c1901428af55e638eb658a0f","url":"https://github.com/advisories/GHSA-4v6x-c7xx-hw9f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-4v6x-c7xx-hw9f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:49.673Z"},{"id":"sr-615a2ed6eab72bb7ac2101b7de80430e","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-2026-30838","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.376Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\nThe `DisallowedRawHtml` extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing `>`. For example, `` would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input.\n\nAll applications using the `DisallowedRawHtml` extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected.\n\n### Patches\n\nFixed in 2.8.1. The regex character class `[ \\/>]` was changed to `[\\s\\/>]` to match all whitespace characters that browsers accept as valid tag name terminators.\n\n### Workarounds\n\n- Set the `html_input` configuration option to `'escape'` or `'strip'` to disable all raw HTML, though this is a broader restriction than the `DisallowedRawHtml` extension provides.\n- Pass the rendered HTML through a dedicated HTML sanitizer before serving it to users (always recommended)","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.8.1"]}],"null_published_at":"2026-11-01T01:45:38.538Z","source_updated_at":"2026-03-20T21:35:35.482Z","source_disclosed_at":"2026-03-06T23:27:03.000Z","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":"2026-10-31T21:41:49.673Z"},{"id":"NVI-00002000","kind":"vulnerability","title":"CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-4v6x-c7xx-hw9f","CVE-2026-30838"],"plain_summary":"OSV carries this publisher advisory for league/commonmark. 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 2.8.1 for league/commonmark. Confirm the publisher’s latest guidance.","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"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}],"schema_version":"1.1.0","source_metrics":[],"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-07c89be3c1901428af55e638eb658a0f","url":"https://github.com/advisories/GHSA-4v6x-c7xx-hw9f","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-4v6x-c7xx-hw9f","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:49.673Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-07c89be3c1901428af55e638eb658a0f"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\nThe `DisallowedRawHtml` extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing `>`. For example, `` would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input.\n\nAll applications using the `DisallowedRawHtml` extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected.\n\n### Patches\n\nFixed in 2.8.1. The regex character class `[ \\/>]` was changed to `[\\s\\/>]` to match all whitespace characters that browsers accept as valid tag name terminators.\n\n### Workarounds\n\n- Set the `html_input` configuration option to `'escape'` or `'strip'` to disable all raw HTML, though this is a broader restriction than the `DisallowedRawHtml` extension provides.\n- Pass the rendered HTML through a dedicated HTML sanitizer before serving it to users (always recommended)","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.8.1"]}],"null_published_at":"2026-10-31T21:53:28.061Z","source_updated_at":"2026-03-20T21:35:35.482Z","source_disclosed_at":"2026-03-06T23:27:03.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:41:49.673Z"}],"next_cursor":null,"snapshot_revision":"40769"}