Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage
35Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 85%
exploitation probability
85%top 1% of all CVEs
observed exploitation
nono source reports it
nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. The nghttp2 library prior to version 1.61.0 keeps reading the unbounded number of HTTP/2 CONTINUATION frames even after a stream is reset to keep HPACK context in sync. This causes excessive CPU usage to decode HPACK stream. nghttp2 v1.61.0 mitigates this vulnerability by limiting the number of CONTINUATION frames it accepts per stream. There is no workaround for this vulnerability.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
nghttp2 · nghttp2References
https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57qhttps://lists.debian.org/debian-lts-announce/2024/04/msg00026.htmlhttps://lists.debian.org/debian-lts-announce/2024/09/msg00041.htmlhttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/https://www.kb.cert.org/vuls/id/421644http://www.openwall.com/lists/oss-security/2024/04/03/16