Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length
    (CVE-2026-54399)

The version of httpcomponents-core installed on the remote host is prior to 4.2.4-6. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3807 advisory.

    Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length     (CVE-2026-54399)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1948 advisory.

    Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length     (CVE-2026-54399)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length     (CVE-2026-54399)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
445928	SCA: security update for org.apache.httpcomponents.core5:httpcore5 (GHSA-hf6x-8p5f-cgmf)	Tenable Cloud Security	SCA Checks	Local	high
445928	SCA: security update for org.apache.httpcomponents.core5:httpcore5 (GHSA-hf6x-8p5f-cgmf)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
328829	Amazon Linux 2 : httpcomponents-core, --advisory ALAS2-2026-3807 (ALAS-2026-3807)	Nessus	Amazon Linux Local Security Checks	Local	high
328455	Amazon Linux 2023 : httpcomponents-core, httpcomponents-core-javadoc (ALAS2023-2026-1948)	Nessus	Amazon Linux Local Security Checks	Local	high
324897	Linux Distros Unpatched Vulnerability : CVE-2026-54399	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-54399

high

Tenable Plugins

high

high

high

high

high