{"id":"CVE-2019-18887","aliases":["DEBIAN-CVE-2019-18887","DLA-1999-1","DSA-4573-1","EUVD-2022-1515","GHSA-q8hg-pf8v-cxrv","UBUNTU-CVE-2019-18887"],"status":"published","title":"Symfony Http-Kernel has non-constant time comparison in UriSigner","description":"An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01338,"percentile":0.71469,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-203"],"published":"2019-11-18T00:00:00Z","modified":"2026-10-24T10:50:35Z","fixes":[{"ecosystem":"Packagist","package":"symfony/http-kernel","fixed_in":["2.8.52","3.4.35","4.2.12","4.3.8"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/symfony","fixed_in":["2.8.52","3.4.35","4.2.12","4.3.8"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"symfony","fixed_in":["4.3.8+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"symfony","fixed_in":["4.3.8+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"symfony","fixed_in":["4.3.8+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"symfony/http-kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.8.52"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/http-kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.4.35"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/http-kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.2.12"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/http-kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.3.0"},{"fixed":"4.3.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.8.52"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.4.35"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.2.12"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.3.0"},{"fixed":"4.3.8"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.21+dfsg-4+deb8u6"}]}],"versions":["2.3.21+dfsg-4","2.3.21+dfsg-4+deb8u1","2.3.21+dfsg-4+deb8u2","2.3.21+dfsg-4+deb8u3","2.3.21+dfsg-4+deb8u4","2.3.21+dfsg-4+deb8u5"],"bundled":3},{"source":"osv","ecosystem":"Debian:9","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.7+dfsg-1.3+deb9u3"}]}],"versions":["2.8.7+dfsg-1.3","2.8.7+dfsg-1.3+deb9u1","2.8.7+dfsg-1.3+deb9u2"],"bundled":2},{"source":"osv","ecosystem":"Debian:10","package":"symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.22+dfsg-2+deb10u1"}]}],"versions":["3.4.22+dfsg-2"],"bundled":2},{"source":"osv","ecosystem":"Packagist","package":"symfony/http-kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.8.52"}]}],"versions":["v2.2.0","v2.2.1","v2.2.10","v2.2.11","v2.2.2","v2.2.3","v2.2.4","v2.2.5","v2.2.6","v2.2.7","v2.2.8","v2.2.9","v2.3.0","v2.3.1","v2.3.10","v2.3.11","v2.3.12","v2.3.13","v2.3.14","v2.3.15","v2.3.16","v2.3.17","v2.3.18","v2.3.19","v2.3.2","v2.3.20","v2.3.21","v2.3.22","v2.3.23","v2.3.24","v2.3.25","v2.3.26","v2.3.27","v2.3.28","v2.3.29","v2.3.3","v2.3.30","v2.3.31","v2.3.32","v2.3.33","v2.3.34","v2.3.35","v2.3.36","v2.3.37","v2.3.38","v2.3.39","v2.3.4","v2.3.40","v2.3.41","v2.3.42","v2.3.5","v2.3.6","v2.3.7","v2.3.8","v2.3.9","v2.4.0","v2.4.0-BETA1","v2.4.0-BETA2","v2.4.0-RC1","v2.4.1","v2.4.10","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.5.0","v2.5.0-BETA1","v2.5.0-BETA2","v2.5.0-RC1","v2.5.1","v2.5.10","v2.5.11","v2.5.12","v2.5.2","v2.5.3","v2.5.4","v2.5.5","v2.5.6","v2.5.7","v2.5.8","v2.5.9","v2.6.0","v2.6.0-BETA1","v2.6.0-BETA2","v2.6.1","v2.6.10","v2.6.11","v2.6.12","v2.6.13","v2.6.2","v2.6.3","v2.6.4","v2.6.5","v2.6.6","v2.6.7","v2.6.8","v2.6.9","v2.7.0","v2.7.0-BETA1","v2.7.0-BETA2","v2.7.1","v2.7.10","v2.7.11","v2.7.12","v2.7.13","v2.7.14","v2.7.15","v2.7.16","v2.7.17","v2.7.18","v2.7.19","v2.7.2","v2.7.20","v2.7.21","v2.7.22","v2.7.23","v2.7.24","v2.7.25","v2.7.26","v2.7.27","v2.7.28","v2.7.29","v2.7.3","v2.7.30","v2.7.31","v2.7.32","v2.7.33","v2.7.34","v2.7.35","v2.7.36","v2.7.37","v2.7.38","v2.7.39","v2.7.4","v2.7.40","v2.7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Advisory","advisory","web","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18887","tags":["advisory"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2019-18887.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18887.yaml","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ/"},{"url":"https://symfony.com/cve-2019-18887","tags":["web"]},{"url":"https://github.com/advisories/GHSA-q8hg-pf8v-cxrv"},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-18887","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2019-18887","tags":["report"]},{"url":"https://github.com/symfony/symfony/commit/cccefe6a7f12e776df0665aeb77fe9294c285fbb","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-18887","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-18887","description":"An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.","status":"published","published":"2019-11-21T22:18:04Z","modified":"2024-08-05T02:02:39.852Z","updated_at":"2026-11-02T14:32:23.485011Z"}],"euvd":[{"id":"EUVD-2022-1515","description":"An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.","status":"published","published":"2019-11-21T22:18:04Z","modified":"2024-08-05T02:02:39Z","updated_at":"2026-11-03T02:40:26.778341Z"}],"ghsa":[{"id":"GHSA-q8hg-pf8v-cxrv","title":"Symfony Http-Kernel has non-constant time comparison in UriSigner","description":"When checking the signature of an URI (an ESI fragment URL for instance), the URISigner did not used a constant time string comparison function, resulting in a potential remote timing attack vulnerability.","status":"published","published":"2022-03-26T00:22:49Z","modified":"2024-02-01T15:49:12Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:37:34.405364Z"}],"nvd":[{"id":"CVE-2019-18887","description":"An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. 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