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Findings

CVE-2026-107283

AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source

Published Oct 8, 2026 · updated Oct 8, 2026

### Impact The client nonce used in HTTP Digest authentication was generated from ThreadLocalRandom, a fast but non-cryptographic pseudorandom number generator. RFC 7616 section 3.3 requires the cnonce to be unpredictable, since it is part of what protects the Digest exchange against chosen-plaintext and precomputation attacks on the credentials. An attacker able to observe or influence enough of the generator's output could reduce the unpredictability the protocol depends on. NTLM (and, on the 3.x line, SCRAM) in this client already use SecureRandom for their own nonces; Digest did not. ### Affected versions * 3.x: up to and including 3.0.11 * 2.x: up to and including 2.16.0 ### Patches Fixed in 3.0.12 on the 3.x line and in 2.16.1 on the 2.x line. The cnonce is now generated with SecureRandom, matching the other authentication schemes in the client. ### Workarounds None available from application code. ### Details Realm.Builder's cnonce generation seeded its bytes from ThreadLocalRandom.current() rather than a SecureRandom instance.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 8, 2026 · GitHub Advisory Database

    Detected

    ### Impact The client nonce used in HTTP Digest authentication was generated from ThreadLocalRandom, a fast but non-cryptographic pseudorandom number generator. RFC 7616 section 3.3 requires the cnonce to be unpredictable, since it is part of what protects the Digest exchange against chosen-plaintext and precomputation attacks on the credentials. An attacker able to observe or influence enough of

  2. Oct 8, 2026 · GitHub Advisory Database

    Fix available

    org.asynchttpclient:async-http-client fixed in 3.0.12; org.asynchttpclient:async-http-client fixed in 2.16.1

  3. Oct 8, 2026 · GitHub Advisory Database

    Fix available

    org.asynchttpclient:async-http-client fixed in 3.0.12

  4. Oct 8, 2026 · GitHub Advisory Database

    Fix available

    org.asynchttpclient:async-http-client fixed in 2.16.1

  5. Oct 8, 2026 · GitHub Advisory Database

    Updated

    ### Impact The client nonce used in HTTP Digest authentication was generated from ThreadLocalRandom, a fast but non-cryptographic pseudorandom number generator. RFC 7616 section 3.3 requires the cnonce to be unpredictable, since it is part of what protects the Digest exchange against chosen-plaintext and precomputation attacks on the credentials. An attacker able to observe or influence enough of

Affected

  • Maven org.asynchttpclient:async-http-client2.0.0 → 2.16.1
  • Maven org.asynchttpclient:async-http-client3.0.0 → 3.0.12

Sources

  • CVE.orgVulnerability recordCVE-2026-107283

    Official CVE identifier

    cve.org
  • GitHub Advisory DatabasePackage advisoryGHSA-mfj3-87qq-382v

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • OSV.devPackage advisoryGHSA-mfj3-87qq-382v

    AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source

    osv.dev

References