{"items":[{"id":"NVI-00017843","kind":"vulnerability","title":"Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-c69g-56f8-xwqj","CVE-2026-59900"],"plain_summary":"GitHub lists this reviewed advisory for io.netty:netty-codec-http2, io.netty:netty-codec-http2. 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-736754cc52200202bbdeb4243eb47776"],"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":[],"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-736754cc52200202bbdeb4243eb47776","url":"https://github.com/advisories/GHSA-c69g-56f8-xwqj","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-c69g-56f8-xwqj","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:39.734Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-736754cc52200202bbdeb4243eb47776"],"technology":"io.netty:netty-codec-http2","known_exclusions":[],"conditions_summary":"Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values.","public_affected_ranges":[">= 4.2.0.Final, <= 4.2.15.Final"]},{"certainty":"source_listed","source_ids":["sr-736754cc52200202bbdeb4243eb47776"],"technology":"io.netty:netty-codec-http2","known_exclusions":[],"conditions_summary":"Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values.","public_affected_ranges":["< 4.1.136.Final"]}],"null_published_at":"2026-11-05T19:10:21.474Z","source_updated_at":"2026-07-22T21:49:28.000Z","source_disclosed_at":"2026-07-22T21:49:28.000Z","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":"2026-11-03T22:34:39.734Z"}],"next_cursor":null,"snapshot_revision":"42594"}