CVE-2026-54428GHSA-V3JC-474W-2WM6
Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.4.3, 5.5-beta2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- org.apache.httpcomponents.core5:httpcore5-h2
From 5.5-alpha · through 5.5-beta1; From 5.0-alpha · through 5.4.2
- org.apache.httpcomponents.core5:httpcore5-h2Maven
fixed in 5.4.3
- org.apache.httpcomponents.core5:httpcore5-h2Maven
From 5.5-alpha1 · fixed in 5.5-beta2