[NEW] [medium] Apache HttpComponents Core: Multiple vulnerabilities allow Denial of Service

mediumCVE-2026-54399 CVE-2026-54428

A remote, anonymous attacker can exploit multiple vulnerabilities in Apache HttpComponents Core to perform a Denial of Service attack.

CSIRTS triage

vendor: Apache product: HttpComponents Core Denial of service

What: A remote, anonymous attacker can exploit multiple vulnerabilities in Apache HttpComponents Core to perform a Denial of Service attack.
Who is affected: Deployments of Apache HttpComponents Core are affected.
Urgency: Remediation is medium urgency as the vulnerabilities can lead to service disruption.
Action: Update to the latest version of Apache HttpComponents Core.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2172

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-543990.87% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-544280.87% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54399	coverage & exploitation status	NVD · CVE.org
CVE-2026-54428	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Apache HttpComponents Core

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highGHSA-v3jc-474w-2wm6: Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACKghsa · 2026-07-01
highGHSA-hf6x-8p5f-cgmf: Apache HttpComponents Core HTTP/1 header parsing can cause memory-exhaustion denial of se…ghsa · 2026-07-01
highCVE-2026-54428: Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache Htt…nvd · 2026-07-01
highCVE-2026-54399: Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpC…nvd · 2026-07-01