GHSA-v3jc-474w-2wm6

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    GHSA-v3jc-474w-2wm6

    Published: 1 Jul 2026Last Modified: 10 Sept 2026

    Summary: Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

    Details: 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.

    References: https://nvd.nist.gov/vuln/detail/CVE-2026-54428, https://github.com/apache/httpcomponents-core/commit/1ea1239bbbe3442a8382a87279c0a8119a7e358e, https://github.com/apache/httpcomponents-core/commit/cc30ee058a7b10cbf4ad3dd6270ab6d1f6a74c49, https://github.com/apache/httpcomponents-core, https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd, http://www.openwall.com/lists/oss-security/2026/07/01/3

    Affected packages

    Package

    Name: org.apache.httpcomponents.core5:httpcore5-h2

    Purl: pkg:maven/org.apache.httpcomponents.core5/httpcore5-h2

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.4.3

    Affected versions

    5.0
    5.0.1
    5.0.2
    5.0.3
    5.0.4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-v3jc-474w-2wm6 | CVE-DB