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Findings

Vulnerability · CVE-2026-107283

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

Published Oct 8, 2026 · corrected/updated Oct 8, 2026 · evidence confidence high

### 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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-107283 is a low public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: org.asynchttpclient:async-http-client (2.0.0 → 2.16.1); org.asynchttpclient:async-http-client (3.0.0 → 3.0.12). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 3.7, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-338. Sources contributing to this record: cve_org, epss, github, osv. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

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

References