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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-07-01

Last modified

2026-10-25

Weaknesses

CWE-400, CWE-770

Affected products

• Httpcomponents Core (Apache)
• Apache Httpcomponents Core (Apache Software Foundation)

References

• https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd
• http://www.openwall.com/lists/oss-security/2026/07/01/3