CVE-2026-107283: AsyncHttpClient Remote Code Execution Vulnerability

LOW
Advisory Identifier: GHSA-mfj3-87qq-382v
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CVSS 3.7
CWE-338
Published
Advisory Summary

CVE-2026-107283 is a LOW (CVSS 3.7) remote code execution vulnerability (CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)) affecting AsyncHttpClient libraries in the Maven ecosystem. The issue involves digest authentication cnonce generated with a non-cryptographic random source. Remediation is available by upgrading affected packages to version 3.0.12, 2.16.1.

CVE-2026-107283 at a Glance

CVE Identifier CVE-2026-107283
GHSA Identifier GHSA-mfj3-87qq-382v
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Affected Product AsyncHttpClient
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-107283

To remediate this vulnerability, upgrade all affected AsyncHttpClient dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.asynchttpclient:async-http-client fixed: 3.0.12 
<dependency>
    <groupId>org.asynchttpclient</groupId>
    <artifactId>async-http-client</artifactId>
    <version>3.0.12</version>
</dependency>
org.asynchttpclient:async-http-client fixed: 2.16.1 
<dependency>
    <groupId>org.asynchttpclient</groupId>
    <artifactId>async-http-client</artifactId>
    <version>2.16.1</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.asynchttpclient

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-107283, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.asynchttpclient

Analyze the terminal output to locate any version of AsyncHttpClient in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.12), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.asynchttpclient command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG), where the product uses a pseudo-random number generator (prng) in a security context, but the prng's algorithm is not cryptographically strong. In AsyncHttpClient, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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.

CVE-2026-107283 Affected AsyncHttpClient Versions

2 component(s)
Fixed Versions:
3.0.122.16.1
Product / Package Ecosystem Affected Versions Fixed Version
org.asynchttpclient:async-http-client
maven/org.asynchttpclient/async-http-client
Maven
≥ 3.0.0
< 3.0.12
3.0.12
org.asynchttpclient:async-http-client
maven/org.asynchttpclient/async-http-client
Maven
≥ 2.0.0
< 2.16.1
2.16.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-mfj3-87qq-382v
NVD — CVE-2026-107283 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107283
Security Fix Commit FIX COMMIT
https://github.com/AsyncHttpClient/async-http-client/commit/dca2d90db87f0144ea893a6858dca13c426d06b6
Security Fix Commit FIX COMMIT
https://github.com/AsyncHttpClient/async-http-client/commit/e1f5fc88fe211d3f64032c33b91093ba3d5e793d
AsyncHttpClient Source Repository REPOSITORY
https://github.com/AsyncHttpClient/async-http-client
AsyncHttpClient Release RELEASE
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
AsyncHttpClient Release RELEASE
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12

Frequently Asked Questions

What is CVE-2026-107283?
CVE-2026-107283 is a security vulnerability in AsyncHttpClient involving Digest authentication cnonce generated with a non-cryptographic random source under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG).
Which AsyncHttpClient versions are affected?
Affected versions include releases prior to 3.0.12, 2.16.1 across affected packages: org.asynchttpclient:async-http-client.
What version fixes CVE-2026-107283?
Upgrading to 3.0.12, 2.16.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is async-http-client affected?
Yes, org.asynchttpclient:async-http-client is affected in releases prior to 3.0.12, 2.16.1. Upgrade your dependency to 3.0.12, 2.16.1 or later.
What is the CVSS score of CVE-2026-107283?
CVE-2026-107283 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-107283?
CVE-2026-107283 is classified under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.).
How can I check Maven dependencies for CVE-2026-107283?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.asynchttpclient'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mfj3-87qq-382v",
  "modified" : "2026-10-08T16:31:04Z",
  "published" : "2026-10-08T16:31:04Z",
  "aliases" : [ "CVE-2026-107283" ],
  "summary" : "AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source",
  "details" : "### Impact\nThe 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.\n\n### Affected versions\n* 3.x: up to and including 3.0.11\n* 2.x: up to and including 2.16.0\n\n### Patches\nFixed 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.\n\n### Workarounds\nNone available from application code.\n\n### Details\nRealm.Builder's cnonce generation seeded its bytes from ThreadLocalRandom.current() rather than a SecureRandom instance.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.0.12"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.0.11"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.asynchttpclient:async-http-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.16.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.16.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-mfj3-87qq-382v"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-107283"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/commit/dca2d90db87f0144ea893a6858dca13c426d06b6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/commit/e1f5fc88fe211d3f64032c33b91093ba3d5e793d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/AsyncHttpClient/async-http-client"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-338" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-08T16:31:04Z",
    "nvd_published_at" : "2026-10-07T22:17:04Z"
  }
}