Description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, Realm.Builder treats a Digest challenge that yields no usable nonce as a Basic challenge. A malicious origin or proxy can label a challenge Digest while omitting or emptying the nonce, causing the client to resend the username and password using reversible Basic authentication. Both origin and proxy challenge parsers are affected. This issue is fixed in versions 3.0.13 and 2.16.1.
Published: 2026-10-07
Score: 8.7 High
EPSS: n/a
KEV: No
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Remediation

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History

Wed, 07 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Description The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, Realm.Builder treats a Digest challenge that yields no usable nonce as a Basic challenge. A malicious origin or proxy can label a challenge Digest while omitting or emptying the nonce, causing the client to resend the username and password using reversible Basic authentication. Both origin and proxy challenge parsers are affected. This issue is fixed in versions 3.0.13 and 2.16.1.
Title AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
Weaknesses CWE-319
CWE-522
CWE-757
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-07T21:06:26.742Z

Reserved: 2026-10-07T14:34:14.817Z

Link: CVE-2026-107231

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-07T22:17:03.320

Modified: 2026-10-07T22:17:03.320

Link: CVE-2026-107231

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-319

    Cleartext Transmission of Sensitive Information

  • CWE-522

    Insufficiently Protected Credentials

  • CWE-757

    Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')