{"id":"CVE-2026-107283","aliases":["CLSA-2026-1791926769","CLSA-2026-1793887823","CLSA-2026-1794351138","DEBIAN-CVE-2026-107283","EUVD-2026-94643","GHSA-mfj3-87qq-382v","UBUNTU-CVE-2026-107283"],"status":"published","title":"AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00263,"percentile":0.18268,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-338"],"published":"2026-10-07T21:24:56Z","modified":"2026-11-11T01:30:02Z","fixes":[{"ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","fixed_in":["3.0.12","2.16.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"last_affected":"3.0.11"},{"fixed":"3.0.12"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"last_affected":"2.16.0"},{"fixed":"2.16.1"}]}]},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-bom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-example","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-guava","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-jdeferred","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-registry","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-retrofit2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-rxjava","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-rxjava2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-simple","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-typesafe-config","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-netty-utils","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-project","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.1"},{"fixed":"2.12.1-tuxcare.1"}]}],"versions":["2.12.1"],"bundled":12},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.3"},{"fixed":"2.12.3-tuxcare.2"}]}],"versions":["2.12.3","2.12.3-tuxcare.1"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-bom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.3"},{"fixed":"2.12.3-tuxcare.2"}]}],"versions":["2.12.3","2.12.3-tuxcare.1"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-example","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.12.3"},{"fixed":"2.12.3-tuxcare.2"}]}],"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Digest authentication cnonce generated with a non-cryptographic random source","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:24:56.64Z","modified":"2026-10-08T14:00:20.347Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-94643","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:24:56Z","modified":"2026-10-08T14:00:20Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T17:27:33.098422Z"}],"ghsa":[{"id":"GHSA-mfj3-87qq-382v","title":"AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source","description":"### 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.","status":"published","published":"2026-10-08T16:31:04Z","modified":"2026-10-08T16:31:05Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:41:29.107536Z"}],"nvd":[{"id":"CVE-2026-107283","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:04.327Z","modified":"2026-10-08T20:35:31.2Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"CVE-2026-107283","title":"AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T21:24:56.64Z","modified":"2026-10-28T10:41:04.975985242Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T15:44:54.933106Z"},{"id":"DEBIAN-CVE-2026-107283","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:04.327Z","modified":"2026-10-12T19:47:26.031973339Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:49.381767Z"},{"id":"GHSA-mfj3-87qq-382v","title":"AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random source","description":"### 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.","status":"published","published":"2026-10-08T16:31:04Z","modified":"2026-10-08T16:45:19.387990416Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"UBUNTU-CVE-2026-107283","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12  and 2.16.1, Realm.Builder generates the HTTP Digest client nonce with ThreadLocalRandom rather than a cryptographically secure random source. Digest relies on an unpredictable cnonce to resist chosen-plaintext and credential precomputation attacks, so an observer able to infer generator state can reduce the protection of the authentication exchange. This issue is fixed in versions 3.0.12 and 2.16.1.","status":"published","published":"2026-10-07T22:17:00Z","modified":"2026-10-17T12:59:47.443051601Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T16:55:59.130573Z"},{"id":"CLSA-2026-1791926769","title":"TuxCare security update for org.asynchttpclient (13 CVEs)","description":"TuxCare rebuilt 14 org.asynchttpclient packages to address 13 CVEs. Fixed in 2.12.1-tuxcare.1.","status":"published","published":"2026-10-13T21:26:09Z","modified":"2026-10-15T09:47:45.855594885Z","updated_at":"2026-11-02T15:43:50.599064Z"},{"id":"CLSA-2026-1793887823","title":"TuxCare security update for org.asynchttpclient (16 CVEs)","description":"TuxCare rebuilt 14 org.asynchttpclient packages to address 16 CVEs. Fixed in 2.12.3-tuxcare.2.","status":"published","published":"2026-11-05T15:10:25Z","modified":"2026-11-06T13:15:13.773820413Z","updated_at":"2026-11-06T13:44:09.891978Z"},{"id":"CLSA-2026-1794351138","title":"TuxCare security update for org.asynchttpclient:async-http-client (9 CVEs)","description":"TuxCare rebuilt org.asynchttpclient:async-http-client to address 9 CVEs. Fixed in 2.3.0-tuxcare.1.","status":"published","published":"2026-11-10T23:52:19Z","modified":"2026-11-11T01:30:02.399301115Z","updated_at":"2026-11-11T01:47:54.277886Z"}]}}