{"id":"CVE-2026-107280","aliases":["CLSA-2026-1791926769","CLSA-2026-1793887823","CLSA-2026-1794351138","DEBIAN-CVE-2026-107280","EUVD-2026-94639","GHSA-f9m8-cv68-674w","UBUNTU-CVE-2026-107280"],"status":"published","title":"AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00261,"percentile":0.17974,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1275"],"published":"2026-10-07T21:15:13Z","modified":"2026-11-11T01:30:02Z","fixes":[{"ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","fixed_in":["3.0.13","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":"3.0.12"},{"fixed":"3.0.13"}]}]},{"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"}]}],"versions":["2.12.3","2.12.3-tuxcare.1"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.asynchttpclient:async-http-client-extras-guava","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-extras-jdeferred","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-extras-parent","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-extras-registry","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-extras-retrofit2","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-extras-rxjava","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-extras-rxjava2","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-extras-simple","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-extras-typesafe-config","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-netty-utils","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-project","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","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.0"},{"fixed":"2.3.0-tuxcare.1"}]}],"versions":["2.3.0"],"bundled":9},{"source":"osv","ecosystem":"Debian:12","package":"async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.3-1","2.12.3-1+deb12u1"]},{"source":"osv","ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.13"}]}],"versions":["3.0.0","3.0.1","3.0.10","3.0.11","3.0.12","3.0.2","3.0.3","3.0.4","3.0.5","3.0.6","3.0.7","3.0.8","3.0.9"]},{"source":"osv","ecosystem":"Maven","package":"org.asynchttpclient:async-http-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.16.1"}]}],"versions":["2.0.0","2.0.1","2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.16","2.0.17","2.0.18","2.0.19","2.0.2","2.0.20","2.0.21","2.0.22","2.0.23","2.0.24","2.0.25","2.0.26","2.0.27","2.0.28","2.0.29","2.0.3","2.0.30","2.0.31","2.0.32","2.0.33","2.0.34","2.0.35","2.0.36","2.0.37","2.0.38","2.0.39","2.0.4","2.0.40","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.0-RC1","2.1.0-RC2","2.1.0-RC3","2.1.0-RC4","2.1.0-alpha1","2.1.0-alpha10","2.1.0-alpha11","2.1.0-alpha12","2.1.0-alpha13","2.1.0-alpha14","2.1.0-alpha15","2.1.0-alpha16","2.1.0-alpha17","2.1.0-alpha18","2.1.0-alpha19","2.1.0-alpha2","2.1.0-alpha20","2.1.0-alpha21","2.1.0-alpha22","2.1.0-alpha23","2.1.0-alpha24","2.1.0-alpha25","2.1.0-alpha26","2.1.0-alpha3","2.1.0-alpha4","2.1.0-alpha5","2.1.0-alpha6","2.1.0-alpha7","2.1.0-alpha8","2.1.0-alpha9","2.1.1","2.1.2","2.10.0","2.10.1","2.10.2","2.10.3","2.10.4","2.10.5","2.11.0","2.12.0","2.12.1","2.12.2","2.12.3","2.12.4","2.14.5","2.15.0","2.16.0","2.2.0","2.2.1","2.3.0","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4","2.4.5","2.4.6","2.4.7","2.4.8","2.4.9","2.5.0","2.5.1","2.5.2","2.5.3","2.5.4","2.6.0","2.7.0","2.8.0","2.8.1","2.9.0"]},{"source":"osv","ecosystem":"Ubun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Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T21:15:13.87Z","modified":"2026-10-08T17:57:38.975Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1275"],"updated_at":"2026-11-02T13:45:14.072357Z"}],"euvd":[{"id":"EUVD-2026-94639","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T21:15:13Z","modified":"2026-10-08T17:57:38Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium"}],"updated_at":"2026-11-02T17:27:27.72962Z"}],"ghsa":[{"id":"GHSA-f9m8-cv68-674w","title":"AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk","description":"### Impact\nThe cookie store decides whether a `Domain` attribute may be accepted using only the domain-matching rule of RFC 6265 Section 5.1.3, which asks whether the request host is the domain or ends with a dot followed by it. Section 5.3 step 5, which additionally requires rejecting a `Domain` that is a public suffix, is not implemented anywhere in the client.\n\nSo a host under a multi-label public suffix can set a cookie for the suffix itself, and the store then hands it to every other host under that suffix:\n\n```\nattacker.co.uk  -\u003e  Set-Cookie: SID=attacker-value; Domain=co.uk; Path=/\nbank.co.uk      -\u003e  Cookie: SID=attacker-value\n```\n\n`Domain=uk` works the same way. The attacker needs only a site under the same suffix as the victim, which for suffixes such as `co.uk`, `com.au`, or `github.io` is trivially obtainable.\n\nDepending on what the application does with the cookie, this is session fixation, or it overwrites a session the victim site set, or it lets the attacker plant a value the victim site trusts.\n\n### Affected versions\n* 3.x: up to and including 3.0.12\n* 2.x: up to and including 2.16.0\n\n### Relationship to CVE-2026-55688\nCVE-2026-55688 (GHSA-m452-q8c9-rg2f) covered the direct form of this, where a host sets a `Domain` naming an unrelated host, and that form is genuinely fixed: `attacker.co.uk` can no longer set `Domain=bank.co.uk`, and this was verified as a control. What that fix did not add is the public suffix test, so setting `Domain=co.uk` still reaches `bank.co.uk`. This advisory covers only the residual.\n\n### Patches\nFixed in 3.0.13 on the 3.x line. The ICANN section of the Mozilla public suffix list is bundled with the client and a `Domain` matching it is rejected, honouring the list's wildcard and exception rules. The list is data and goes stale, so a suffix added upstream after a release is not recognised until the bundled copy is refreshed. The 2.x line is not yet fixed.\n\n### Workarounds\nDo not share one `CookieStore` across origins that are not mutually trusted. Supplying a `CookieStore` implementation that rejects `Domain` values which are public suffixes also avoids it.\n\n### Details\n`ThreadSafeCookieStore.domainsMatch` is `requestDomain.equals(cookieDomain) || requestDomain.endsWith('.' + cookieDomain)`. It is used both to accept a `Domain` on storage and to select cookies for a request, and neither call site consults a public suffix list. A search of the client for any public suffix or effective TLD handling returns nothing.","status":"published","published":"2026-10-08T16:30:53Z","modified":"2026-10-08T16:30:54Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium"}],"cwes":["CWE-1275"],"updated_at":"2026-11-02T14:41:29.107536Z"}],"nvd":[{"id":"CVE-2026-107280","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T22:17:03.81Z","modified":"2026-10-08T20:35:31.2Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-1275"],"updated_at":"2026-11-02T14:12:55.142936Z"}],"osv":[{"id":"CVE-2026-107280","title":"AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T21:15:13.87Z","modified":"2026-10-28T10:51:11.982526026Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium"}],"cwes":["CWE-1275"],"updated_at":"2026-11-02T15:44:54.933106Z"},{"id":"DEBIAN-CVE-2026-107280","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T22:17:03.81Z","modified":"2026-10-12T19:47:20.698597284Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:49.381767Z"},{"id":"GHSA-f9m8-cv68-674w","title":"AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk","description":"### Impact\nThe cookie store decides whether a `Domain` attribute may be accepted using only the domain-matching rule of RFC 6265 Section 5.1.3, which asks whether the request host is the domain or ends with a dot followed by it. Section 5.3 step 5, which additionally requires rejecting a `Domain` that is a public suffix, is not implemented anywhere in the client.\n\nSo a host under a multi-label public suffix can set a cookie for the suffix itself, and the store then hands it to every other host under that suffix:\n\n```\nattacker.co.uk  -\u003e  Set-Cookie: SID=attacker-value; Domain=co.uk; Path=/\nbank.co.uk      -\u003e  Cookie: SID=attacker-value\n```\n\n`Domain=uk` works the same way. The attacker needs only a site under the same suffix as the victim, which for suffixes such as `co.uk`, `com.au`, or `github.io` is trivially obtainable.\n\nDepending on what the application does with the cookie, this is session fixation, or it overwrites a session the victim site set, or it lets the attacker plant a value the victim site trusts.\n\n### Affected versions\n* 3.x: up to and including 3.0.12\n* 2.x: up to and including 2.16.0\n\n### Relationship to CVE-2026-55688\nCVE-2026-55688 (GHSA-m452-q8c9-rg2f) covered the direct form of this, where a host sets a `Domain` naming an unrelated host, and that form is genuinely fixed: `attacker.co.uk` can no longer set `Domain=bank.co.uk`, and this was verified as a control. What that fix did not add is the public suffix test, so setting `Domain=co.uk` still reaches `bank.co.uk`. This advisory covers only the residual.\n\n### Patches\nFixed in 3.0.13 on the 3.x line. The ICANN section of the Mozilla public suffix list is bundled with the client and a `Domain` matching it is rejected, honouring the list's wildcard and exception rules. The list is data and goes stale, so a suffix added upstream after a release is not recognised until the bundled copy is refreshed. The 2.x line is not yet fixed.\n\n### Workarounds\nDo not share one `CookieStore` across origins that are not mutually trusted. Supplying a `CookieStore` implementation that rejects `Domain` values which are public suffixes also avoids it.\n\n### Details\n`ThreadSafeCookieStore.domainsMatch` is `requestDomain.equals(cookieDomain) || requestDomain.endsWith('.' + cookieDomain)`. It is used both to accept a `Domain` on storage and to select cookies for a request, and neither call site consults a public suffix list. A search of the client for any public suffix or effective TLD handling returns nothing.","status":"published","published":"2026-10-08T16:30:53Z","modified":"2026-10-08T16:45:19.478132339Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium"}],"cwes":["CWE-1275"],"updated_at":"2026-11-02T15:46:46.39441Z"},{"id":"UBUNTU-CVE-2026-107280","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, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.","status":"published","published":"2026-10-07T22:17:00Z","modified":"2026-10-17T12:58:44.117816669Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N","level":"medium"}],"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"}]}}