{"id":"GHSA-w3vp-jw9m-f9pm","summary":"Unbounded queuing of path validation messages in cloudflare-quiche","details":"### Impact\nquiche v. 0.15.0 through 0.19.0 was discovered to be vulnerable to unbounded queuing of path validation messages, which could lead to excessive resource consumption.\n\nQUIC path validation ([RFC 9000 Section 8.2](https://datatracker.ietf.org/doc/html/rfc9000#section-8.2)) requires that the recipient of a PATH_CHALLENGE frame responds by sending a PATH_RESPONSE. An unauthenticated remote attacker can exploit the vulnerability by sending PATH_CHALLENGE frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that PATH_RESPONSE frames can only be sent at the slower rate than they are received, leading to storage of path validation data in an unbounded queue.\n\n### Patches\nQuiche versions greater than 0.19.0 address this problem.\n\n### References\n[CVE-2023-6193](https://www.cve.org/CVERecord?id=CVE-2023-6193)\n[RFC 9000 Section 8.2](https://datatracker.ietf.org/doc/html/rfc9000#section-8.2)","aliases":["CVE-2023-6193"],"modified":"2026-07-08T06:53:09.204971916Z","published":"2023-12-13T13:34:55Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2023-12-13T13:34:55Z","nvd_published_at":"2023-12-12T14:15:07Z","cwe_ids":["CWE-400"]},"references":[{"type":"WEB","url":"https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-6193"},{"type":"WEB","url":"https://github.com/cloudflare/quiche/commit/ea7ecf39ae28ab24cf1785c1674dc2e8a076f9ca"},{"type":"WEB","url":"https://datatracker.ietf.org/doc/html/rfc9000#section-8.2"},{"type":"PACKAGE","url":"https://github.com/cloudflare/quiche"}],"affected":[{"package":{"name":"quiche","ecosystem":"crates.io","purl":"pkg:cargo/quiche"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.15.0"},{"fixed":"0.19.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-w3vp-jw9m-f9pm/GHSA-w3vp-jw9m-f9pm.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}