CVE-2026-54428
Last modified
CVE-2026-54428 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.59% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Apache | Httpcomponents Core | >= 5.0, <= 5.4.2 | — |
| Apache | Httpcomponents Core | 5.5 | Alpha1 |
References
- https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sdMitigation, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/07/01/3Mitigation, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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