CVE-2024-28182

Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage

MEDIUM
5.3
CVSS Score
Published: April 4, 2024 at 02:41 PM UTC
Updated: October 15, 2026 at 01:17 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraNGHTTP2

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Severity
MEDIUM5.3
Exploit prediction
EPSS 85%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.61.0
Affected range stops below 1.61.0, so it looks safe — our inference, not a vendor statement

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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