CVE-2026-45300 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-45300HIGH

AsyncHttpClient async-http-client — async-http-client: Cookie header not stripped on cross-origin redirect

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  H  N  N    7.4   .0032   25.1     —

AFFECTED
  Product            Versions                    Fixed
  async-http-client  >= 3.0.0.Beta1, < 3.0.10 –  —

TIMELINE
  May 11  Reserved by GitHub_M
  Jun 5   EXPLOIT PUBLISHED — CVE-2026-45300 (AsyncHttpClient async-http-client). Public exploit reference added.
  Jun 5   Published (CNA: GitHub_M)

CWE-200 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak `Cookie` headers to cross-origin redirect targets. When following a redirect to a different origin, the `propagatedHeaders()` method in `Redirect30xInterceptor.java` strips `Authorization` and `Proxy-Authorization` headers but does not strip the `Cookie` header, causing session cookies and other sensitive cookie values to be sent to attacker-controlled servers. Versions 2.15.0 and 3.0.10 patch the issue.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 11, 2026	Reserved	Reserved by GitHub_M
June 5, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45300 (AsyncHttpClient async-http-client). Public exploit reference added.
June 5, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
AsyncHttpClient	async-http-client	—	>= 3.0.0.Beta1, < 3.0.10	—

Weaknesses

CWE-200

References (3)

https://github.com/AsyncHttpClient/async-http-client/commit/3b0e3e9e [Patch]
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.10 [Product, Release Notes]
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm [Exploit, Mitigation, Patch, Vendor Advisory]

Authoritative record: CVE-2026-45300 at cve.org

Vendors: asynchttpclient

Weaknesses: CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45300 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.