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

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

CSIRTS triage

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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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.

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

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