GHSA-v3jc-474w-2wm6
Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.apache.httpcomponents.core5:httpcore5-h2 | < 5.4.3 | 5.4.3 |
| Maven | org.apache.httpcomponents.core5:httpcore5-h2 | >= 5.5-alpha1, < 5.5-beta2 | 5.5-beta2 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-54428
- https://github.com/apache/httpcomponents-core/commit/1ea1239bbbe3442a8382a87279c0a8119a7e358e
- https://github.com/apache/httpcomponents-core/commit/cc30ee058a7b10cbf4ad3dd6270ab6d1f6a74c49
- https://github.com/apache/httpcomponents-core
- https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd
- http://www.openwall.com/lists/oss-security/2026/07/01/3