{"items":[{"id":"NVI-00016290","kind":"vulnerability","title":"AIOHTTP's C parser (llhttp) accepts null bytes and control characters in response header values - header injection/security bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-63hf-3vf5-4wqf","CVE-2026-34520"],"plain_summary":"GitHub lists this reviewed advisory for aiohttp. 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-617abead81a7d79976f7146aa3e8426e"],"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":"2026-07-15T21:50:23.000Z","value":"9.1 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-617abead81a7d79976f7146aa3e8426e"}],"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-617abead81a7d79976f7146aa3e8426e","url":"https://github.com/advisories/GHSA-63hf-3vf5-4wqf","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-63hf-3vf5-4wqf","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T09:59:43.724Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-617abead81a7d79976f7146aa3e8426e"],"technology":"aiohttp","known_exclusions":[],"conditions_summary":"### Summary\n\nThe C parser (the default for most installs) accepted null bytes and control characters in request headers.\n\n### Impact\n\nAn attacker could send header values that are interpreted differently than expected due to the presence of control characters. For example, `request.url.origin()` may return a different value than the raw Host header, or what a reverse proxy interpreted it as., potentially resulting in some kind of security bypass.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/9370b9714a7a56003cacd31a9b4ae16eab109ba4","public_affected_ranges":["<= 3.13.3"]}],"null_published_at":"2026-11-04T10:04:27.928Z","source_updated_at":"2026-07-15T21:50:23.000Z","source_disclosed_at":"2026-04-01T21:49:06.000Z","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":"2026-11-04T09:59:43.724Z"}],"next_cursor":null,"snapshot_revision":"42594"}