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

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.

Published: 2024-04-04 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-28182 is rated Moderate Risk (61.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 84.96%, 100th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +59.99% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-28182

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 24.97% 84.96% +59.99%
2 2026-03-24 25.45% 24.97% -0.48%
3 2026-03-21 — 25.45% —

Full EPSS history (47 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-28182

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2024-28182

OS Trackers for CVE-2024-28182

vendor priority summary link
alpine — CVE-2024-28182: 1 source package rows (nghttp2); 18 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 18. https://security.alpinelinux.org/vuln/CVE-2024-28182
debian not yet assigned CVE-2024-28182 not yet assigned priority: Debian including 1 source packages (nghttp2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-28182
gentoo normal CVE-2024-28182: 1 GLSA(s) (202408-10), 1 atom(s) (net-libs/nghttp2); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-28182
redhat medium — https://access.redhat.com/security/cve/CVE-2024-28182
suse high CVE-2024-28182 severity important: SUSE including 331 source package names (1.2.3-2.2.132:libnghttp2-14-1.40.0-150200.17.1, 1.2.3-3.2.153:libnghttp2-14-1.40.0-150200.17.1, …), 659 product×package rows across 254 product lines (Container bci/golang, Container bci/nodejs, … (254 product lines)): Fixed 446, Known Affected 200, Known Not Affected 13. https://www.suse.com/security/cve/CVE-2024-28182/
ubuntu medium CVE-2024-28182 medium priority: Ubuntu including 1 source packages (nghttp2), 7 status rows across 7 suites (bionic, focal, jammy, mantic, noble, upstream, xenial): released 7. https://ubuntu.com/security/CVE-2024-28182

Affected software / configurations for CVE-2024-28182

Vendor Product Version Raw CPE
nghttp2 nghttp2 < 1.61.0 cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
fedoraproject fedora 38 cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
fedoraproject fedora 39 cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
fedoraproject fedora 40 cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*

References for CVE-2024-28182

URL Tags
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
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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