{"items":[{"id":"NVI-00015135","kind":"vulnerability","title":"pymdown-extensions: exponential-backtracking ReDoS in caret, tilde, betterem, and magiclink inline processors","revision":2,"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-gm37-52c6-37mw","CVE-2026-67422"],"plain_summary":"GitHub lists this reviewed advisory for pymdown-extensions. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-52b8371f0554ff405294459bc4fdf701"],"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":"2026-08-07T18:26:08.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-2a7ec0620ebda7c8cd4ecc2b583d7154"},{"kind":"CVSS","as_of":"2026-10-24T16:10:00.153Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-52b8371f0554ff405294459bc4fdf701"}],"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-2a7ec0620ebda7c8cd4ecc2b583d7154","url":"https://github.com/advisories/GHSA-gm37-52c6-37mw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-gm37-52c6-37mw","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T02:28:46.523Z"},{"id":"sr-52b8371f0554ff405294459bc4fdf701","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67422","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-67422","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T15:07:43.109Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-2a7ec0620ebda7c8cd4ecc2b583d7154"],"technology":"pymdown-extensions","known_exclusions":[],"conditions_summary":"### Summary\n\nFour inline processors in pymdown-extensions contain regular expressions with\nexponential backtracking. A single untrusted Markdown line under\n50 bytes drives `markdown.markdown()` into unbounded CPU on the rendering thread\n(seconds at ~45 bytes, growing exponentially with each added character). All four\nfire in the extension's **default configuration**\nand are reachable through the documented public API. The `caret`/`tilde`/\n`betterem` blow-up was introduced by the emphasis-pattern rewrite in PR #2547\n(first released in **10.13**, Dec 2024) — earlier releases used a linear\n`(.+?)` / `([^\\s]+?)` content group — and is present through **11.0** (latest);\n`magiclink`'s host pattern is long-standing and affects effectively all releases.\nLikely **CWE-1333 (Inefficient Regular Expression Complexity)**.\n\nThis is a distinct issue from CVE-2025-68142 (ReDoS in `pymdownx.blocks.caption`,\n`RE_FIG_NUM`, fixed in 10.16.1): different extensions, different regexes, and a\ndifferent root cause (delimiter-run partition ambiguity rather than a `.`/`\\.`\ntypo).\n\n### Details\n\nFour regexes share, or closely mirror, a vulnerable shape — an inner group that\ncan partition a run of the delimiter","public_affected_ranges":["<= 11.0.0"]}],"null_published_at":"2026-11-08T19:53:44.057Z","source_updated_at":"2026-08-07T18:26:08.000Z","source_disclosed_at":"2026-08-07T18:26:07.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-03T02:28:46.523Z"},{"id":"NVI-00015135","kind":"vulnerability","title":"pymdown-extensions: exponential-backtracking ReDoS in caret, tilde, betterem, and magiclink inline processors","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-gm37-52c6-37mw","CVE-2026-67422"],"plain_summary":"GitHub lists this reviewed advisory for pymdown-extensions. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2a7ec0620ebda7c8cd4ecc2b583d7154"],"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":"2026-08-07T18:26:08.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-2a7ec0620ebda7c8cd4ecc2b583d7154"}],"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-2a7ec0620ebda7c8cd4ecc2b583d7154","url":"https://github.com/advisories/GHSA-gm37-52c6-37mw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-gm37-52c6-37mw","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T02:28:46.523Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-2a7ec0620ebda7c8cd4ecc2b583d7154"],"technology":"pymdown-extensions","known_exclusions":[],"conditions_summary":"### Summary\n\nFour inline processors in pymdown-extensions contain regular expressions with\nexponential backtracking. A single untrusted Markdown line under\n50 bytes drives `markdown.markdown()` into unbounded CPU on the rendering thread\n(seconds at ~45 bytes, growing exponentially with each added character). All four\nfire in the extension's **default configuration**\nand are reachable through the documented public API. The `caret`/`tilde`/\n`betterem` blow-up was introduced by the emphasis-pattern rewrite in PR #2547\n(first released in **10.13**, Dec 2024) — earlier releases used a linear\n`(.+?)` / `([^\\s]+?)` content group — and is present through **11.0** (latest);\n`magiclink`'s host pattern is long-standing and affects effectively all releases.\nLikely **CWE-1333 (Inefficient Regular Expression Complexity)**.\n\nThis is a distinct issue from CVE-2025-68142 (ReDoS in `pymdownx.blocks.caption`,\n`RE_FIG_NUM`, fixed in 10.16.1): different extensions, different regexes, and a\ndifferent root cause (delimiter-run partition ambiguity rather than a `.`/`\\.`\ntypo).\n\n### Details\n\nFour regexes share, or closely mirror, a vulnerable shape — an inner group that\ncan partition a run of the delimiter","public_affected_ranges":["<= 11.0.0"]}],"null_published_at":"2026-11-03T10:03:26.553Z","source_updated_at":"2026-08-07T18:26:08.000Z","source_disclosed_at":"2026-08-07T18:26:07.000Z","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":"2026-11-03T02:28:46.523Z"}],"next_cursor":null,"snapshot_revision":"42594"}