High
async-http-client — security advisory
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.
- Products
- async-http-client
- Affected versions
- 1.6.5-1, 1.6.5-2, 1.6.5-2ubuntu0.1~esm1, 1.6.5-4, 1.6.5-5, 2.12.2-1, 2.12.3-1, 2.12.3-1ubuntu0.22.04.1, 2.12.3-1ubuntu0.24.04.1, 2.12.3-1ubuntu1, 2.12.3-1ubuntu1.1, 2.6.0-1, 2.6.0-1ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45300
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:13 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-45300
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
Complete source record
{
"id": "65dd91e1c1ef4e2568f422aaf8868ebfe2e7de504c8d19a1a70e8deab291eb8f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-45300",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-45300",
"summary": "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.",
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"severity": "high",
"structured": {
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"aliases": [
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],
"modified": "2026-10-17T12:58:22.481070680Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-45300",
"https://www.cve.org/CVERecord?id=CVE-2026-45300",
"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm",
"https://github.com/AsyncHttpClient/async-http-client/commit/3b0e3e9e",
"https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.10"
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358620,
"published_at": "2026-06-05T20:17:00+00:00"
}