{"id":"CVE-2019-17638","aliases":["CLSA-2026-1780361408","DEBIAN-CVE-2019-17638","EUVD-2020-0652","GHSA-58qw-p7qm-5rvh","GHSA-x3rh-m7vp-35f2","RHSA-2020:3808","RHSA-2020:3841","RHSA-2020:4223","UBUNTU-CVE-2019-17638"],"status":"published","title":"Eclipse Jetty XmlParser allows arbitrary DOCTYPE declarations","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","severity":{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.11138,"percentile":0.95977,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-611","CWE-672","CWE-675"],"published":"2020-07-09T18:10:12Z","modified":"2026-11-02T19:45:31Z","exploits":[{"source":"pocgithub","id":"forse01/CVE-2019-17638-Jetty","title":"forse01/CVE-2019-17638-Jetty","date":"2021-02-04","url":"https://github.com/forse01/CVE-2019-17638-Jetty"}],"fixes":[{"ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","fixed_in":["11.0.16","10.0.16","12.0.0","9.4.52.v20230823"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"org.eclipse.jetty:jetty-server","fixed_in":["9.4.30.v20200611"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"jetty9","fixed_in":["9.4.31-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"jetty9","fixed_in":["9.4.31-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"jetty9","fixed_in":["9.4.31-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-alpha0"},{"last_affected":"11.0.15"},{"fixed":"11.0.16"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0-alpha0"},{"last_affected":"10.0.15"},{"fixed":"10.0.16"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"12.0.0.alpha0"},{"last_affected":"12.0.0.beta4"},{"fixed":"12.0.0"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"9.4.51"},{"fixed":"9.4.52.v20230823"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.4.27"},{"last_affected":"9.4.30.v20200610"},{"fixed":"9.4.30.v20200611"}]}]},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.eclipse.jetty:jetty-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.2.16.v20160414"},{"fixed":"9.2.16.v20160414-tuxcare.1"}]}],"versions":["9.2.16.v20160414"],"bundled":11},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.eclipse.jetty:jetty-servlets","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.2.16.v20160414"},{"fixed":"9.2.16.v20160414-tuxcare.1"}]}],"versions":["9.2.16.v20160414"],"bundled":11},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.eclipse.jetty:jetty-webapp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.2.16.v20160414"},{"fixed":"9.2.16.v20160414-tuxcare.1"}]}],"versions":["9.2.16.v20160414"],"bundled":11},{"source":"osv","ecosystem":"TuxCare:Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.2.16.v20160414"},{"fixed":"9.2.16.v20160414-tuxcare.1"}]}],"versions":["9.2.16.v20160414"],"bundled":11},{"source":"osv","ecosystem":"Debian:12","package":"jetty9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.4.31-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"jetty9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.4.31-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"jetty9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.4.31-1"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0-alpha0"},{"fixed":"10.0.16"}]}],"versions":["10.0.0","10.0.0-alpha0","10.0.0.alpha1","10.0.0.alpha2","10.0.0.beta0","10.0.0.beta1","10.0.0.beta2","10.0.0.beta3","10.0.1","10.0.10","10.0.11","10.0.12","10.0.13","10.0.14","10.0.15","10.0.2","10.0.3","10.0.4","10.0.5","10.0.6","10.0.7","10.0.8","10.0.9"]},{"source":"osv","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-alpha0"},{"fixed":"11.0.16"}]}],"versions":["11.0.0","11.0.0-alpha0","11.0.0.beta1","11.0.0.beta2","11.0.0.beta3","11.0.1","11.0.10","11.0.11","11.0.12","11.0.13","11.0.14","11.0.15","11.0.2","11.0.3","11.0.4","11.0.5","11.0.6","11.0.7","11.0.8","11.0.9"]},{"source":"osv","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"12.0.0.alpha0"},{"fixed":"12.0.0"}]}],"versions":["12.0.0.alpha0","12.0.0.alpha1","12.0.0.alpha2","12.0.0.alpha3","12.0.0.beta0","12.0.0.beta1","12.0.0.beta2","12.0.0.beta3","12.0.0.beta4"]},{"source":"osv","ecosystem":"Maven","package":"org.eclipse.jetty:jetty-xml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.4.52.v20230823"}]}],"versions":["7.0.0.M0","7.0.0.M1","7.0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ticle"]},{"url":"https://access.redhat.com/errata/RHSA-2020:3841","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_3841.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2020:4223","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_4223.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2019-17638","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-17638","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"published","published":"2020-07-09T18:10:12Z","modified":"2024-08-05T01:47:13.63Z","cwes":["CWE-672","CWE-675"],"updated_at":"2026-11-02T14:20:24.989116Z"}],"euvd":[{"id":"EUVD-2020-0652","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"published","published":"2020-07-09T18:10:12Z","modified":"2024-08-05T01:47:13Z","updated_at":"2026-11-03T02:40:28.860423Z"}],"ghsa":[{"id":"GHSA-58qw-p7qm-5rvh","title":"Eclipse Jetty XmlParser allows arbitrary DOCTYPE declarations","description":"### From the reporter\n\n\u003e `XmlParser` is vulnerable to XML external entity (XXE) vulnerability.\n\u003e  XmlParser is being used when parsing Jetty’s xml configuration files. An attacker might exploit\n\u003e this vulnerability in order to achieve SSRF or cause a denial of service.\n\u003e One possible scenario is importing a (remote) malicious WAR into a Jetty’s server, while the\n\u003e WAR includes a malicious web.xml.\n\n### Impact\nThere are no circumstances in a normally deployed Jetty server where potentially hostile XML is given to the XmlParser class without the attacker already having arbitrary access to the server. I.e. in order to exploit `XmlParser` the attacker would already have the ability to deploy and execute hostile code.  Specifically, Jetty has no protection against malicious web application and potentially hostile web applications should only be run on an isolated virtualisation.  \n\nThus this is not considered a vulnerability of the Jetty server itself, as any such usage of the jetty XmlParser is equally vulnerable as a direct usage of the JVM supplied SAX parser.  No CVE will be allocated to this advisory.\n\nHowever, any direct usage of the `XmlParser` class by an application may be vulnerable.  The impact would greatly depend on how the application uses `XmlParser`, but it could be a denial of service due to large entity expansion, or possibly the revealing local files if the XML results are accessible remotely.\n\n### Patches\nAbility to configure the SAXParserFactory to fit the needs of your particular XML parser implementation have been merged as part of PR #10067\n\n### Workarounds\nDon't use Jetty's `XmlParser` to parse data from users.","status":"published","published":"2023-07-10T21:52:39Z","modified":"2026-02-10T20:06:18Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"cwes":["CWE-611"],"updated_at":"2026-11-02T14:39:24.742346Z"},{"id":"GHSA-x3rh-m7vp-35f2","title":"Operation on a Resource after Expiration or Release in Jetty Server","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with response2 data. Thread1 then proceeds to write the buffer that now contains response2 data. This results in client1, which issued request1 and expects responses, to see response2 which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.).","status":"published","published":"2020-08-05T14:52:59Z","modified":"2023-02-01T05:04:22Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-672","CWE-675"],"updated_at":"2026-11-02T14:36:32.120868Z"}],"nvd":[{"id":"CVE-2019-17638","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"published","published":"2020-07-09T18:15:10.427Z","modified":"2026-06-17T02:24:19.417Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-672","CWE-675"],"updated_at":"2026-11-02T14:05:47.558959Z"}],"osv":[{"id":"CVE-2019-17638","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"published","published":"2020-07-09T18:15:10.427Z","modified":"2026-10-24T10:31:01.979594686Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"updated_at":"2026-11-02T15:44:11.673963Z"},{"id":"DEBIAN-CVE-2019-17638","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"published","published":"2020-07-09T18:15:10.427Z","modified":"2026-09-21T07:02:31.099432955Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"updated_at":"2026-11-02T15:45:31.867036Z"},{"id":"GHSA-58qw-p7qm-5rvh","title":"Eclipse Jetty XmlParser allows arbitrary DOCTYPE declarations","description":"### From the reporter\n\n\u003e `XmlParser` is vulnerable to XML external entity (XXE) vulnerability.\n\u003e  XmlParser is being used when parsing Jetty’s xml configuration files. An attacker might exploit\n\u003e this vulnerability in order to achieve SSRF or cause a denial of service.\n\u003e One possible scenario is importing a (remote) malicious WAR into a Jetty’s server, while the\n\u003e WAR includes a malicious web.xml.\n\n### Impact\nThere are no circumstances in a normally deployed Jetty server where potentially hostile XML is given to the XmlParser class without the attacker already having arbitrary access to the server. I.e. in order to exploit `XmlParser` the attacker would already have the ability to deploy and execute hostile code.  Specifically, Jetty has no protection against malicious web application and potentially hostile web applications should only be run on an isolated virtualisation.  \n\nThus this is not considered a vulnerability of the Jetty server itself, as any such usage of the jetty XmlParser is equally vulnerable as a direct usage of the JVM supplied SAX parser.  No CVE will be allocated to this advisory.\n\nHowever, any direct usage of the `XmlParser` class by an application may be vulnerable.  The impact would greatly depend on how the application uses `XmlParser`, but it could be a denial of service due to large entity expansion, or possibly the revealing local files if the XML results are accessible remotely.\n\n### Patches\nAbility to configure the SAXParserFactory to fit the needs of your particular XML parser implementation have been merged as part of PR #10067\n\n### Workarounds\nDon't use Jetty's `XmlParser` to parse data from users.","status":"published","published":"2023-07-10T21:52:39Z","modified":"2026-09-10T03:50:08.640067019Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"cwes":["CWE-611"],"updated_at":"2026-11-02T15:46:38.213481Z"},{"id":"GHSA-x3rh-m7vp-35f2","title":"Operation on a Resource after Expiration or Release in Jetty Server","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with response2 data. Thread1 then proceeds to write the buffer that now contains response2 data. This results in client1, which issued request1 and expects responses, to see response2 which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.).","status":"published","published":"2020-08-05T14:52:59Z","modified":"2024-03-14T05:49:04.832402Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-672","CWE-675"],"updated_at":"2026-11-02T15:46:59.484835Z"},{"id":"RHSA-2020:3808","title":"Red Hat Security Advisory: OpenShift Container Platform 4.3.38 jenkins and openshift security update","status":"published","published":"2024-09-16T04:48:09Z","modified":"2026-08-08T10:01:50Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:3841","title":"Red Hat Security Advisory: OpenShift Container Platform 4.5.13 jenkins security update","status":"published","published":"2024-09-16T04:48:17Z","modified":"2026-08-05T10:07:44Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:4223","title":"Red Hat Security Advisory: OpenShift Container Platform 3.11.306 jenkins security update","status":"published","published":"2024-09-16T04:48:31Z","modified":"2026-08-05T10:07:48Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"UBUNTU-CVE-2019-17638","description":"In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).","status":"withdrawn","published":"2020-07-09T18:15:00Z","modified":"2025-07-16T08:14:31.816365Z","cvss":[{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"updated_at":"2026-11-02T15:54:20.325378Z"},{"id":"CLSA-2026-1780361408","title":"TuxCare security update for org.eclipse.jetty (12 CVEs)","description":"TuxCare rebuilt 4 org.eclipse.jetty packages to address 12 CVEs. Fixed in 9.2.16.v20160414-tuxcare.1.","status":"published","published":"2026-08-04T14:52:34Z","modified":"2026-11-02T19:45:31.458523467Z","updated_at":"2026-11-02T20:30:18.404297Z"}]}}