{"id":"GHSA-mhvj-jhpq-885v","summary":"blaze: Multiple HTTP/1.1 request-smuggling primitives in blaze's Java wire parser","details":"### Summary\n  Five independent HTTP/1.1 conformance laxities in blaze's hand-written Java parser (`http/src/main/java/org/http4s/blaze/http/parser/`) cause request-boundary disagreement with a stricter intermediary. All are reachable from a default `BlazeServerBuilder` with no non-default configuration.\n\n### Impact\nActual exploitability depends on the fronting proxy — a boundary disagreement requires a *pair* of parsers that disagree. Where the proxy forwards the malformed bytes and derives a different message boundary, the consequences are the standard set: front-end ACL/auth bypass, response-queue poisoning on pooled backend connections, and cache poisoning. Risk concentrates on lenient or legacy intermediaries.\n\n### Workarounds\n  Deploy behind an RFC-strict reverse proxy (nginx, HAProxy, Envoy, ALB) that rejects or re-serializes malformed requests at the edge; this neutralizes most of these for deployments that cannot upgrade immediately.","aliases":["CVE-2026-73494"],"modified":"2026-08-12T21:25:59.355788Z","published":"2026-07-24T22:26:27Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-444"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-07-24T22:26:27Z"},"references":[{"type":"WEB","url":"https://github.com/http4s/blaze/security/advisories/GHSA-mhvj-jhpq-885v"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/3f7c022e306631b006dcb43a1d7f65c0d1966f17"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/4eec2007806aa9acfefb00ebb636ddc39a147a96"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/927b67753a78c13c4445dac9307f511f5c4878c3"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/a54bc9cd31758335c7f24e29763622fd03fcf734"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/c47d9675f87603f11b32a11d503626bdf9be5c7a"},{"type":"WEB","url":"https://github.com/http4s/blaze/commit/e871ebb1d27f50c98fd56988526ce42d0fee74d6"},{"type":"PACKAGE","url":"https://github.com/http4s/blaze"},{"type":"WEB","url":"https://github.com/http4s/blaze/releases/tag/v0.23.18"},{"type":"WEB","url":"https://github.com/http4s/blaze/releases/tag/v1.0.0-M42"}],"affected":[{"package":{"name":"org.http4s:http4s-blaze-server_2.13","ecosystem":"Maven","purl":"pkg:maven/org.http4s/http4s-blaze-server_2.13"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23.18"}]}],"versions":["0.10.0-M10","0.21.0","0.21.0-M1","0.21.0-M2","0.21.0-M3","0.21.0-M4","0.21.0-M5","0.21.0-M6","0.21.0-RC1","0.21.0-RC2","0.21.0-RC3","0.21.0-RC4","0.21.0-RC5","0.21.1","0.21.11","0.21.12","0.21.13","0.21.14","0.21.15","0.21.16","0.21.17","0.21.18","0.21.19","0.21.2","0.21.20","0.21.21","0.21.22","0.21.23","0.21.24","0.21.25","0.21.26","0.21.27","0.21.28","0.21.29","0.21.3","0.21.30","0.21.31","0.21.32","0.21.33","0.21.34","0.21.4","0.21.5","0.21.6","0.21.7","0.21.8","0.21.9","0.22-129-24d065b","0.22-143-49b5a8d","0.22-53-01128f5","0.22-96-55d3184","0.22.0","0.22.0-M1","0.22.0-M2","0.22.0-M3","0.22.0-M4","0.22.0-M5","0.22.0-M6","0.22.0-M7","0.22.0-M8","0.22.0-RC1","0.22.1","0.22.10","0.22.11","0.22.12","0.22.13","0.22.14","0.22.15","0.22.2","0.22.3","0.22.4","0.22.5","0.22.6","0.22.7","0.22.8","0.22.9","0.23.0","0.23.0-M1","0.23.0-RC1","0.23.1","0.23.10","0.23.11","0.23.12","0.23.13","0.23.14","0.23.15","0.23.16","0.23.17","0.23.2","0.23.3","0.23.4","0.23.5","0.23.6","0.23.7","0.23.8","0.23.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-mhvj-jhpq-885v/GHSA-mhvj-jhpq-885v.json","last_known_affected_version_range":"\u003c= 0.23.17"}},{"package":{"name":"org.http4s:blaze-http_2.13","ecosystem":"Maven","purl":"pkg:maven/org.http4s/blaze-http_2.13"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23.18"}]}],"versions":["0.14.10","0.14.11","0.14.12","0.14.13","0.14.14","0.14.15","0.14.16","0.14.17","0.14.18","0.14.5","0.14.6","0.14.7","0.14.8","0.14.9","0.15.0","0.15.0-M1","0.15.0-M2","0.15.0-M3","0.15.1","0.15.2","0.15.3","0.23.12","0.23.13","0.23.14","0.23.15","0.23.16","0.23.17"],"database_specific":{"last_known_affected_version_range":"\u003c= 0.23.17","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-mhvj-jhpq-885v/GHSA-mhvj-jhpq-885v.json"}},{"package":{"name":"org.http4s:blaze-http_3","ecosystem":"Maven","purl":"pkg:maven/org.http4s/blaze-http_3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23.18"}]}],"versions":["0.15.0","0.15.1","0.15.2","0.15.3","0.23.12","0.23.13","0.23.14","0.23.15","0.23.16","0.23.17"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-mhvj-jhpq-885v/GHSA-mhvj-jhpq-885v.json","last_known_affected_version_range":"\u003c= 0.23.17"}},{"package":{"name":"org.http4s:blaze-http_3","ecosystem":"Maven","purl":"pkg:maven/org.http4s/blaze-http_3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0-M1"},{"fixed":"1.0.0-M42"}]}],"versions":["1.0.0-M33","1.0.0-M34","1.0.0-M35","1.0.0-M36","1.0.0-M37","1.0.0-M38","1.0.0-M39","1.0.0-M40","1.0.0-M41"],"database_specific":{"last_known_affected_version_range":"\u003c= 1.0.0-M41","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-mhvj-jhpq-885v/GHSA-mhvj-jhpq-885v.json"}},{"package":{"name":"org.http4s:blaze-http_2.13","ecosystem":"Maven","purl":"pkg:maven/org.http4s/blaze-http_2.13"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0-M1"},{"fixed":"1.0.0-M42"}]}],"versions":["1.0.0-M33","1.0.0-M34","1.0.0-M35","1.0.0-M36","1.0.0-M37","1.0.0-M38","1.0.0-M39","1.0.0-M40","1.0.0-M41"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-mhvj-jhpq-885v/GHSA-mhvj-jhpq-885v.json","last_known_affected_version_range":"\u003c= 1.0.0-M41"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}