{"id":"GHSA-w8gf-g2vq-j2f4","aliases":[],"title":"amphp/http-client  Denial of Service via HTTP/2 CONTINUATION Frames","description":"Early versions of `amphp/http-client` with HTTP/2 support (v4.0.0-rc10 to 4.0.0) will collect HTTP/2 `CONTINUATION` frames in an unbounded buffer and will not check the header size limit until it has received the `END_HEADERS` flag, resulting in an OOM crash. Later versions of `amphp/http-client` (v4.1.0-rc1 and up) depend on `amphp/http` for HTTP/2 processing and will therefore need an updated version of `amphp/http`, see [GHSA-qjfw-cvjf-f4fm](https://github.com/amphp/http/security/advisories/GHSA-qjfw-cvjf-f4fm).\n\n## Acknowledgements\n\nThank you to [Bartek Nowotarski](https://nowotarski.info/) for reporting the vulnerability.","severity":"high","score":8.2,"published":"2024-04-03T18:49:42.000Z","modified":"2026-07-08T06:52:51.943Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"amphp/http-client","ranges":[{"events":[{"introduced":"4.0.0-rc10"},{"fixed":"4.1.0-rc1"}],"type":"ECOSYSTEM"}],"versions":["v4.0.0","v4.0.0-rc10","v4.0.0-rc11"],"fixed":["4.1.0-rc1"]}],"references":["https://github.com/amphp/http-client/security/advisories/GHSA-w8gf-g2vq-j2f4","https://github.com/amphp/http/security/advisories/GHSA-qjfw-cvjf-f4fm","https://github.com/amphp/http-client"],"sources":[{"name":"OSV","id":"GHSA-w8gf-g2vq-j2f4","modified":"2026-07-08T06:52:51.943094832Z","url":"https://osv.dev/vulnerability/GHSA-w8gf-g2vq-j2f4"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","score":8.2}]}