| Name | CVE-2026-54428 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1141387 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| httpcomponents-core (PTS) | bullseye | 4.4.14-1 | fixed |
| bookworm | 4.4.16-1 | fixed |
| forky, sid, trixie | 4.4.16-1 | vulnerable |
| httpcomponents-core5 (PTS) | bookworm | 5.2.1-1 | vulnerable |
| trixie | 5.2.2-1 | vulnerable |
| forky, sid | 5.4.2-1.1 | vulnerable |
The information below is based on the following data on fixed versions.
Notes
[trixie] - httpcomponents-core5 <no-dsa> (Minor issue)
[bookworm] - httpcomponents-core5 <postponed> (Minor issue; HTTP/2 HPACK decoder present in 5.x, unlike 4.x)
[trixie] - httpcomponents-core <no-dsa> (Minor issue)
[bookworm] - httpcomponents-core <not-affected> (HTTP/2 HPACK not implemented in httpcomponents-core 4.x (v5-only feature))
[bullseye] - httpcomponents-core <not-affected> (HTTP/2 HPACK not implemented in httpcomponents-core 4.x (v5-only feature))
https://www.openwall.com/lists/oss-security/2026/07/01/3
v4 possibly not affected, needs further validation once fix is identified