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CVE-2026-45300

Asynchttpclient Project Async-http-client information disclosure

7.4 HIGHPublic exploitEPSS 0.46%
  1. Published5 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Affected products

Asynchttpclient Project Async-http-client≥ 2.0.0 < 2.15.0 · ≥ 3.0.0 < 3.0.10

Remediation

Fixed in
Asynchttpclient Project Async-http-client≥ 2.15.0

References

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Frequently asked

Is CVE-2026-45300 being actively exploited?

CVE-2026-45300 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.46%.

How severe is CVE-2026-45300?

CVE-2026-45300 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2026-45300?

Affected products include Asynchttpclient Project Async-http-client.

How do I fix CVE-2026-45300?

Upgrade affected software to a fixed version, for example Asynchttpclient Project Async-http-client 2.15.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-45300 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.