Answer in brief
CVE-2026-54399 records a High severity (CVSS 7.5) vulnerability in Apache HttpComponents Core HTTP/1 header parsing can cause memory-exhaustion denial of service. The current sources do not mark it as known exploited. The current feed maps org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven), org.apache.httpcomponents.core5:httpcore5 (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.apache.httpcomponents.core5:httpcore5maven | <5.4.3 | 5.4.3 |
| org.apache.httpcomponents.core5:httpcore5maven | >=5.5-alpha1,<5.5-beta2 | 5.5-beta2 |
| org.apache.httpcomponents.core5:httpcore5maven | >=0 <5.4.3 | 5.4.3 |
| org.apache.httpcomponents.core5:httpcore5maven | >=5.5-alpha1 <5.5-beta2 | 5.5-beta2 |
Published upstream
Jul 1, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
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
Quoted source text, attributed separately from HOL analysis.