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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HttpComponents Core | 5.5-alpha – ≤ 5.5-beta1, 5.0-alpha – ≤ 5.4.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | httpcomponents-core | No fix yet | — |
| Debian 14 | httpcomponents-core5 | 5.4.3-1 | — |
| Debian 13 | httpcomponents-core +1 | No fix yet | — |
| Debian 12 | httpcomponents-core5 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | httpcomponents-core +1 | No fix yet | — |
| Ubuntu 26.04 LTS | httpcomponents-core +1 | No fix yet | — |
| Ubuntu 25.10 | httpcomponents-core +1 | No fix yet | — |
| Ubuntu 24.04 LTS | httpcomponents-core +1 | No fix yet | — |
| Ubuntu 22.04 LTS | httpcomponents-core +1 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | httpcomponents-core | No fix yet | — |
| Ubuntu 18.04 LTS | httpcomponents-core | No fix yet | — |
| Ubuntu 16.04 LTS | httpcomponents-core | No fix yet | — |
| Ubuntu 14.04 LTS | httpcomponents-core | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | akhq | 0.28.0-r4 | — |
| Wolfi rolling | apicurio-registry | 3.3.1-r5 | — |
| Wolfi rolling | cassandra-reaper | 5.0.0-r7 | — |
| Wolfi rolling | cloudwatch-exporter | 0.18.0-r2 | — |
| Wolfi rolling | druid | 37.0.0-r50 | — |
| Wolfi rolling | flyway | 13.7.0-r1 | — |
| Wolfi rolling | kserve-modelmesh | 0.12.0-r39 | — |
| Wolfi rolling | logstash-9.3 +1 | 9.3.8-r2 | — |
| Wolfi rolling | logstash-9.4 +1 | 9.4.5-r1 | — |
| Wolfi rolling | nrjmx | 2.13.0-r2 | — |
| Wolfi rolling | opensearch-3 +8 | 3.7.0-r14 | — |
| Wolfi rolling | opensearch-3-discovery-ec2 +2 | 3.8.0-r3 | — |
| Wolfi rolling | sonarqube | 26.8.0.126808-r1 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1.3-r18 | — |
| Wolfi rolling | trino-plugin-clickhouse | 484-r0 | — |
| Wolfi rolling | wavefront-proxy | 13.9-r29 | — |
| Wolfi rolling | zipkin +1 | 3.6.1-r26 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.httpcomponents.core5:httpcore5-h2 | < 5.4.3 | 5.4.3 | GHSA-v3jc-474w-2wm6 |
| Maven | org.apache.httpcomponents.core5:httpcore5-h2 | >= 5.5-alpha1, < 5.5-beta2 | 5.5-beta2 | GHSA-v3jc-474w-2wm6 |
Advisories 5
- WID-SEC-2026-4056 Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye und Jira): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- WID-SEC-2026-3376 Atlassian Bamboo, Bitbucket, Confluence, Fisheye/Crucible, Jira Software und Jira Service Management: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- WID-SEC-2026-2172 Apache HttpComponents Core: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 9, 2026
- NCSC-2026-0448 Kwetsbaarheden verholpen in Oracle Fusion Middleware NCSC-NL (Netherlands) · Oct 22, 2026
- WID-SEC-2026-4078 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 2026
References
- https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd vendor-advisory