CVE-2026-54428

EUVD-2026-41095
Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 45.27%
Affected Products (NVD)
VendorProductVersion
apachehttpcomponents_core
5.0 ≤
𝑥
≤ 5.4.2
apachehttpcomponents_core
5.5:alpha1
apachehttpcomponents_core
5.5:beta1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
httpcomponents-core
bookworm
4.4.16-1
fixed
bullseye
4.4.14-1
fixed
forky
vulnerable
sid
vulnerable
trixie
no-dsa
httpcomponents-core5
bookworm
postponed
forky
vulnerable
sid
5.4.3-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
httpcomponents-core
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
trusty
needs-triage
httpcomponents-core5
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd
http://www.openwall.com/lists/oss-security/2026/07/01/3