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.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0 Patch
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9 Patch
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q Vendor Advisory
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0 Patch
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9 Patch
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.3 · nghttp2, debian, fedoraprojectNVD modified 2026-10-15 01:17
Affected (CPE criteria) 6
cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*
References 20
- http://www.openwall.com/lists/oss-security/2024/04/03/16 Mailing List, Third Party Advisory
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0 Patch
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9 Patch
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html Mailing List
- https://lists.fedoraproject.org/archives/list/[email protected]/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/ Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2024/04/03/16 Mailing List, Third Party Advisory
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0 Patch
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9 Patch
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html Mailing List
- https://lists.debian.org/debian-lts-announce/2024/09/msg00041.html Mailing List
- https://lists.fedoraproject.org/archives/list/[email protected]/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/ Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/ Mailing List, Third Party Advisory
- https://www.kb.cert.org/vuls/id/421644
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-784301.html