Medium 5.3Published Apr 4, 2024

CVE-2024-28182Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage

Updated under an hour ago (Oct 27, 2026, 10:30 AM ET)

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It affects nghttp2 and 6 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for nghttp2

Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

nghttp2 nghttp2 nghttp2:nghttp2 (from the name)	before 1.61.0	CNA record
nghttp2 nghttp2 nghttp2:nghttp2	before 1.61.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SINEC NMS siemens:sinec_nms (from the name)	before V3.0	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
nghttp2 nghttp2 nghttp2:nghttp2	before 1.61.0	NVD
debian debian_linux debian:debian_linux	10.0; 11.0	NVD
fedoraproject fedora fedoraproject:fedora	38; 39; 40	NVD

References

References

https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q	x-refsource-confirm, vendor-advisory
https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0	x-refsource-misc, patch
https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9	x-refsource-misc, patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/	mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/	mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html	mailing-list
http://www.openwall.com/lists/oss-security/2024/04/03/16	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00041.html	mailing-list
https://www.kb.cert.org/vuls/id/421644
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.