What’s Vulnerable › Vulnerabilities
CVE-2024-28182: Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 85.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-04-04 · updated 2026-10-15
- Weakness: CWE-770
Description
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.
Affected products
- Debian Linux: 10.0, 11.0
- Fedoraproject Fedora: 38, 39, 40
- nghttp2: before 1.61.0 — fixed in 1.61.0
How to fix
Upgrade to a fixed version: nghttp2 1.61.0. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2024/04/03/16
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q
- https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html
- https://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/
- http://www.openwall.com/lists/oss-security/2024/04/03/16
- https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0
- https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q
Get alerted when CVE-2024-28182 or the next vulnerability affects your stack