{"items":[{"id":"NVI-00020100","kind":"vulnerability","title":"Netty: HttpObjectDecoder skips arbitrary initial control characters when only initial CRLF characters are permitted","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hvcg-qmg6-jm4c","CVE-2026-50020"],"plain_summary":"GitHub lists this reviewed advisory for io.netty:netty-codec-http, io.netty:netty-codec-http. 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-7545b16361406ad04256e892d95d41b6"],"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":"2026-06-15T20:46:37.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7545b16361406ad04256e892d95d41b6"}],"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-7545b16361406ad04256e892d95d41b6","url":"https://github.com/advisories/GHSA-hvcg-qmg6-jm4c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hvcg-qmg6-jm4c","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T07:20:20.042Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7545b16361406ad04256e892d95d41b6"],"technology":"io.netty:netty-codec-http","known_exclusions":[],"conditions_summary":"## Summary\n\nBefore reading the first request-line, `HttpObjectDecoder` skips every byte for which\n`Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace.\nRFC 9112 §2.2 only asks servers to ignore **empty CRLF lines** preceding the request-line —\na carefully scoped robustness allowance intended to handle HTTP/1.0 POST workarounds.\nSilently absorbing NUL bytes, SOH, STX, and other non-CRLF control characters goes\nsignificantly beyond this, and can be exploited for request-boundary confusion in pipelined\nor multiplexed transports where a front-end component treats those bytes differently.\n\n## Affected Code\n\n| File | Lines | Role |\n|------|-------|------|\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1298–1313 | `ISO_CONTROL_OR_WHITESPACE` static initialiser — marks all ISO control chars |\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1307–1313 | `SKIP_CONTROL_CHARS_BYTES` `ByteProcessor` — skips the entire set |\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1275–1289 | `LineParser.skipControlChars` — advances `readerIndex` past all matching bytes |\n","public_affected_ranges":[">= 4.2.0.Final, <= 4.2.14.Final"]},{"certainty":"source_listed","source_ids":["sr-7545b16361406ad04256e892d95d41b6"],"technology":"io.netty:netty-codec-http","known_exclusions":[],"conditions_summary":"## Summary\n\nBefore reading the first request-line, `HttpObjectDecoder` skips every byte for which\n`Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace.\nRFC 9112 §2.2 only asks servers to ignore **empty CRLF lines** preceding the request-line —\na carefully scoped robustness allowance intended to handle HTTP/1.0 POST workarounds.\nSilently absorbing NUL bytes, SOH, STX, and other non-CRLF control characters goes\nsignificantly beyond this, and can be exploited for request-boundary confusion in pipelined\nor multiplexed transports where a front-end component treats those bytes differently.\n\n## Affected Code\n\n| File | Lines | Role |\n|------|-------|------|\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1298–1313 | `ISO_CONTROL_OR_WHITESPACE` static initialiser — marks all ISO control chars |\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1307–1313 | `SKIP_CONTROL_CHARS_BYTES` `ByteProcessor` — skips the entire set |\n| `codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java` | 1275–1289 | `LineParser.skipControlChars` — advances `readerIndex` past all matching bytes |\n","public_affected_ranges":["<= 4.1.134.Final"]}],"null_published_at":"2026-11-08T15:11:49.349Z","source_updated_at":"2026-06-15T20:46:37.000Z","source_disclosed_at":"2026-06-15T20:46:36.000Z","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":"2026-11-06T07:20:20.042Z"}],"next_cursor":null,"snapshot_revision":"42594"}