CVE-2026-40490 | AsyncHttpClient async-http-client up to 2.14.4/3.0.8 on Basic/Digest Header Authorization information disclosure (GHSA-cmxv-58fp-fm3g)

VDB-358161 · CVE-2026-40490 · GHSA-CMXV-58FP-FM3G ASYNCHTTPCLIENT ASYNC-HTTP-CLIENT UP TO 2.14.4/3.0.8 ON BASIC/DIGEST HEADER AUTHORIZATION INFORMATION DISCLOSURE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.2 $0-$5k 1.52+ Summaryinfo A vulnerability classified as problematic has been found in AsyncHttpClient async-http-client up to 2.14.4/3.0.8 on Basic/Digest. Affected by this issue is some unknown functionality of the component Header Handler. Performing a manipulation of the argument Authorization results in information disclosure. This vulnerability is identified as CVE-2026-40490. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in AsyncHttpClient async-http-client up to 2.14.4/3.0.8 on Basic/Digest. It has been classified as problematic. This affects some unknown processing of the component Header Handler. The manipulation of the argument Authorization with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is: The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. When redirect following is enabled (followRedirect(true)), versions of AsyncHttpClient prior to 3.0.9 and 2.14.5 forward Authorization and Proxy-Authorization headers along with Realm credentials to arbitrary redirect targets regardless of domain, scheme, or port changes. This leaks credentials on cross-domain redirects and HTTPS-to-HTTP downgrades. Additionally, even when stripAuthorizationOnRedirect is set to true, the Realm object containing plaintext credentials is still propagated to the redirect request, causing credential re-generation for Basic and Digest authentication schemes via NettyRequestFactory. An attacker who controls a redirect target (via open redirect, DNS rebinding, or MITM on HTTP) can capture Bearer tokens, Basic auth credentials, or any other Authorization header value. The fix in versions 3.0.9 and 2.14.5 automatically strips Authorization and Proxy-Authorization headers and clears Realm credentials whenever a redirect crosses origin boundaries (different scheme, host, or port) or downgrades from HTTPS to HTTP. For users unable to upgrade, set `(stripAuthorizationOnRedirect(true))` in the client config and avoid using Realm-based authentication with redirect following enabled. Note that `(stripAuthorizationOnRedirect(true))` alone is insufficient on versions prior to 3.0.9 and 2.14.5 because the Realm bypass still re-generates credentials. Alternatively, disable redirect following (`followRedirect(false)`) and handle redirects manually with origin validation. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-40490 since 04/13/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue. Upgrading to version 2.14.5 or 3.0.9 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor AsyncHttpClient Name async-http-client Version 2.14.0 2.14.1 2.14.2 2.14.3 2.14.4 3.0.0 3.0.1 3.0.2 3.0.3 3.0.4 3.0.5 3.0.6 3.0.7 3.0.8 License open-source Website Product: https://github.com/AsyncHttpClient/async-http-client/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.2 VulDB Meta Temp Score: 5.2 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.8 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Information disclosure CWE: CWE-200 / CWE-284 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: async-http-client 2.14.5/3.0.9 Patch: github.com Timelineinfo 04/13/2026 CVE reserved 04/18/2026 +5 days Advisory disclosed 04/18/2026 +0 days VulDB entry created 04/18/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-cmxv-58fp-fm3g Status: Confirmed CVE: CVE-2026-40490 (🔒) GCVE (CVE): GCVE-0-2026-40490 GCVE (VulDB): GCVE-100-358161 Entryinfo Created: 04/18/2026 09:01 Changes: 04/18/2026 09:01 (69) Complete: 🔍 Cache ID: 99:3DD:101 Discussion No comments yet. 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