{"cve":"CVE-2026-54428","nvd":{"published":"2026-07-01T18:16:34.507","modified":"2026-10-25T17:10:00.197","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-770"],"references":["https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd","http://www.openwall.com/lists/oss-security/2026/07/01/3"],"products":["apache:httpcomponents_core"],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-54428","score":0.00871,"percentile":0.58583,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-v3jc-474w-2wm6","url":"https://osv.dev/vulnerability/GHSA-v3jc-474w-2wm6","summary":"Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK","modified":"2026-09-10T03:51:12.247227504Z","packages":[{"ecosystem":"Maven","name":"org.apache.httpcomponents.core5:httpcore5-h2","purl":"pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2","ranges":["<5.4.3"],"fixed":["5.4.3"]},{"ecosystem":"Maven","name":"org.apache.httpcomponents.core5:httpcore5-h2","purl":"pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2","ranges":[">=5.5-alpha1 <5.5-beta2"],"fixed":["5.5-beta2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}