CVE-2026-54428
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.
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-400, CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:httpcomponents_core
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-v3jc-474w-2wm6 | 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 |