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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd	Mitigation Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/07/01/3	Mitigation Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:apache:httpcomponents_core::::::::
	cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1::::::
	cpe:2.3:a:apache:httpcomponents_core:5.5:beta1::::::

History

06 Jul 2026, 18:47

Type	Values Removed	Values Added
References	~~() https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd -~~	() https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd - Mitigation, Vendor Advisory
References	~~() http://www.openwall.com/lists/oss-security/2026/07/01/3 -~~	() http://www.openwall.com/lists/oss-security/2026/07/01/3 - Mitigation, Third Party Advisory
CPE		cpe:2.3:a:apache:httpcomponents_core:::::::: cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:::::: cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1::::::
First Time		Apache httpcomponents Core Apache

01 Jul 2026, 19:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

01 Jul 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-01 18:16

Updated : 2026-07-06 18:47

NVD link : CVE-2026-54428

Mitre link : CVE-2026-54428

CVE.ORG link : CVE-2026-54428

JSON object : View

Products Affected

apache

httpcomponents_core

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-54428", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54428", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-01T18:15:24.114171Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache HttpComponents Core", "versions": [{"status": "affected", "version": "5.5-alpha", "versionType": "maven", "lessThanOrEqual": "5.5-beta1"}, {"status": "affected", "version": "5.0-alpha", "versionType": "maven", "lessThanOrEqual": "5.4.2"}], "packageName": "org.apache.httpcomponents.core5:httpcore5-h2", "collectionURL": "https://repo.maven.apache.org/maven2/", "defaultStatus": "unaffected"}]}], "published": "2026-07-01T18:16:34.507", "references": [{"url": "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd", "tags": ["Mitigation", "Vendor Advisory"], "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/07/01/3", "tags": ["Mitigation", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-07-06T18:47:13.097", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:httpcomponents_core:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7424FBC1-6EDE-4EA4-88E3-EEFD10CF5A5F", "versionEndIncluding": "5.4.2"}, {"criteria": "cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3A6F1338-5376-4581-AF9B-202B62133A9F"}, {"criteria": "cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "860D474E-62CA-463F-AD9A-B7C44C148CD2"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}