{"items":[{"id":"NVI-00005836","kind":"vulnerability","title":"league/commonmark: Denial of service via distinctly-named attributes in the Attributes extension","revision":5,"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-8rr7-cvq3-gmfh","CVE-2026-86428"],"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 2.10.0 for league/commonmark. Confirm the publisher’s latest guidance.","source_ids":["sr-9e814d182ef2b6138623b7d186afa165"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-86428","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.075Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9e814d182ef2b6138623b7d186afa165"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\n`AttributesExtension` ships with the library but must be explicitly registered on the `Environment`; it is not included in `CommonMarkConverter`, `GithubFlavoredMarkdownConverter`, or `GithubFlavoredMarkdownExtension`. **Applications that do not register `AttributesExtension` are not affected by this advisory.**\n\nTwo paths in the extension re-process every attribute a node has already collected each time another attribute is applied to it. When the attributes carry distinct names, the collected set grows by one on every step and is walked again in full, so a run of *n* attributes costs O(n²).\n\n**1. Attribute nodes resolving to a common target (affected from 1.5.0).**\n\n`AttributesListener::processDocument()` merges each attribute node into the set accumulated for its target, then filters the result. Both operations traverse that entire set: `AttributesHelper::mergeAttributes()` rebuilds it with `array_merge()`, and `AttributesHelper::filterAttributes()` matches a regular expression against every name in it. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-86428","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:17:01.143Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9e814d182ef2b6138623b7d186afa165"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\n`AttributesExtension` ships with the library but must be explicitly registered on the `Environment`; it is not included in `CommonMarkConverter`, `GithubFlavoredMarkdownConverter`, or `GithubFlavoredMarkdownExtension`. **Applications that do not register `AttributesExtension` are not affected by this advisory.**\n\nTwo paths in the extension re-process every attribute a node has already collected each time another attribute is applied to it. When the attributes carry distinct names, the collected set grows by one on every step and is walked again in full, so a run of *n* attributes costs O(n²).\n\n**1. Attribute nodes resolving to a common target (affected from 1.5.0).**\n\n`AttributesListener::processDocument()` merges each attribute node into the set accumulated for its target, then filters the result. Both operations traverse that entire set: `AttributesHelper::mergeAttributes()` rebuilds it with `array_merge()`, and `AttributesHelper::filterAttributes()` matches a regular expression against every name in it. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-86428","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.385Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9e814d182ef2b6138623b7d186afa165"],"technology":"league/commonmark","known_exclusions":[],"conditions_summary":"### Impact\n\n`AttributesExtension` ships with the library but must be explicitly registered on the `Environment`; it is not included in `CommonMarkConverter`, `GithubFlavoredMarkdownConverter`, or `GithubFlavoredMarkdownExtension`. **Applications that do not register `AttributesExtension` are not affected by this advisory.**\n\nTwo paths in the extension re-process every attribute a node has already collected each time another attribute is applied to it. When the attributes carry distinct names, the collected set grows by one on every step and is walked again in full, so a run of *n* attributes costs O(n²).\n\n**1. 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Attribute nodes resolving to a common target (affected from 1.5.0).**\n\n`AttributesListener::processDocument()` merges each attribute node into the set accumulated for its target, then filters the result. Both operations traverse that entire set: `AttributesHelper::mergeAttributes()` rebuilds it with `array_merge()`, and `AttributesHelper::filterAttributes()` matches a regular expression against every name in it. 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When the attributes carry distinct names, the collected set grows by one on every step and is walked again in full, so a run of *n* attributes costs O(n²).\n\n**1. Attribute nodes resolving to a common target (affected from 1.5.0).**\n\n`AttributesListener::processDocument()` merges each attribute node into the set accumulated for its target, then filters the result. Both operations traverse that entire set: `AttributesHelper::mergeAttributes()` rebuilds it with `array_merge()`, and `AttributesHelper::filterAttributes()` matches a regular expression against every name in it. 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