---
id: CVE-2024-28182
title: nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C
summary: >-
  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 conte…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-770
vendor: nghttp2
product: nghttp2
affected:
  - nghttp2 < 1.61.0
  - debian_linux = 10.0
  - debian_linux = 11.0
  - fedora = 38
  - fedora = 39
  - fedora = 40
patched:
  - nghttp2 1.61.0
published: '2024-04-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:41.807'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-28182'
references:
  - url: 'http://www.openwall.com/lists/oss-security/2024/04/03/16'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0
    label: security-advisories@github.com
  - url: >-
      https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9
    label: security-advisories@github.com
  - url: 'https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q'
    label: security-advisories@github.com
  - url: 'https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html'
    label: security-advisories@github.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/
    label: security-advisories@github.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/
    label: security-advisories@github.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/
    label: security-advisories@github.com
  - url: 'http://www.openwall.com/lists/oss-security/2024/04/03/16'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/nghttp2/nghttp2/commit/00201ecd8f982da3b67d4f6868af72a1b03b14e0
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/nghttp2/nghttp2/commit/d71a4668c6bead55805d18810d633fbb98315af9
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/nghttp2/nghttp2/security/advisories/GHSA-x6x3-gv8h-m57q'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/04/msg00026.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/09/msg00041.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AGOME6ZXJG7664IPQNVE3DL67E3YP3HY/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J6ZMXUGB66VAXDW5J6QSTHM5ET25FGSA/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXJO2EASHM2OQQLGVDY5ZSO7UVDVHTDK/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.kb.cert.org/vuls/id/421644'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784301.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.8496
epssPercentile: 0.99712
ingestedAt: '2026-10-15T03:30:12.649Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2024-04-04T17:15:08.320689Z'
---

## Overview

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

- `nghttp2 < 1.61.0`
- `debian_linux = 10.0`
- `debian_linux = 11.0`
- `fedora = 38`
- `fedora = 39`
- `fedora = 40`

## Remediation

Upgrade past the affected range:

- `nghttp2 1.61.0`