{"id":"CVE-2020-29509","aliases":["ALPINE-CVE-2020-29509","AZL-6448","AZL-78900","BELL-CVE-2020-29509","BIT-golang-2020-29509","DEBIAN-CVE-2020-29509","EUVD-2022-1254","GHSA-xhqq-x44f-9fgg","GO-2021-0060","OESA-2021-1011","UBUNTU-CVE-2020-29509"],"status":"published","title":"Authentication Bypass in github.com/russellhaering/gosaml2","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02099,"percentile":0.81849,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-115"],"published":"2020-12-14T20:02:02Z","modified":"2026-11-03T06:32:37Z","fixes":[{"ecosystem":"Go","package":"github.com/russellhaering/gosaml2","fixed_in":["0.6.0"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.18","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"go","fixed_in":["1.17-r0"],"sources":["osv"]},{"ecosystem":"Azure Linux:2","package":"golang","fixed_in":["1.20.10-1"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"golang","fixed_in":["1.17.0"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS","package":"golang","fixed_in":["1.13.15-2.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"golang","fixed_in":["1.13.15-2.oe1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/russellhaering/gosaml2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"go","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-r0"}]}]},{"source":"osv","ecosystem":"Azure Linux:2","package":"golang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.19.0"},{"fixed":"1.20.10-1"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"golang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.26.7-1"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"golang","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}]},{"source":"osv","ecosystem":"Debian:11","package":"golang-1.15","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.15-1","1.15.15-1~deb11u1","1.15.15-1~deb11u2","1.15.15-1~deb11u3","1.15.15-1~deb11u4","1.15.15-2","1.15.15-3","1.15.15-4","1.15.15-5","1.15.9-6"]},{"source":"osv","ecosystem":"Go","package":"github.com/russellhaering/gosaml2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.6.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/russellhaering/gosaml2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.6.0"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS","package":"golang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.15-2.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"golang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.15-2.oe1"}]}]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4-2ubuntu1~14.04.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4-2ubuntu1~16.04.1","1.10.4-2ubuntu1~16.04.2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"golang-1.6","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6-0ubuntu1","1.6-0ubuntu2","1.6-0ubuntu3","1.6-0ubuntu4","1.6-0ubuntu5","1.6.1-0ubuntu1","1.6.2-0ubuntu5~16.04","1.6.2-0ubuntu5~16.04.2","1.6.2-0ubuntu5~16.04.3","1.6.2-0ubuntu5~16.04.4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.8-1ubuntu1~16.04.2","1.13.8-1ubuntu1~16.04.3","1.13.8-1ubuntu1~16.04.3+esm2","1.13.8-1ubuntu1~16.04.3+esm3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.10","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10~rc1-1","1.10~rc1-1ubuntu1","1.10~rc1-2ubuntu1","1.10~rc2-1ubuntu1","1.10-1ubuntu1","1.10.1-1ubuntu2","1.10.4-2ubuntu1~18.04.1","1.10.4-2ubuntu1~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.8-1ubuntu1~18.04.2","1.13.8-1ubuntu1~18.04.3","1.13.8-1ubuntu1~18.04.4","1.13.8-1ubuntu1~18.04.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-2ubuntu1","1.8.3-2ubuntu1.18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"golang-1.9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.1-2ubuntu1","1.9.2-1ubuntu1","1.9.2-3ubuntu1","1.9.3-1ubuntu1","1.9.4-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.1-1ubuntu1","1.13.3-1ubuntu1","1.13.4-1ubuntu1","1.13.5-1ubuntu1","1.13.6-1ubuntu1","1.13.6-2ubuntu1","1.13.7-1ubuntu1","1.13.8-1ubuntu1","1.13.8-1ubuntu1.1","1.13.8-1ubuntu1.2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-1.14","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14~beta1-1","1.14~beta1-2","1.14~rc1-1","1.14-1","1.14.1-1","1.14.2-1","1.14.2-1ubuntu1","1.14.3-2ubuntu2~20.04.1","1.14.3-2ubuntu2~20.04.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"golang-1.13","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.8-1ubuntu2","1.13.8-1ubuntu2.22.04.1","1.13.8-1ubuntu2.22.04.1+esm1","1.13.8-1ubuntu2.22.04.2"]}],"products":[{"vendor":"ecies","product":"go"},{"vendor":"golang","product":"go"},{"vendor":"netapp","product":"trident"}],"references":[{"url":"https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://security.netapp.com/advisory/ntap-20210129-0006/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://github.com/russellhaering/gosaml2/security/advisories/GHSA-xhqq-x44f-9fgg","tags":["web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-29509","tags":["web","advisory"]},{"url":"https://github.com/russellhaering/gosaml2/commit/42606dafba60c58c458f14f75c4c230459672ab9","tags":["web","fix"]},{"url":"https://pkg.go.dev/vuln/GO-2021-0060","tags":["web"]},{"url":"https://github.com/advisories/GHSA-xhqq-x44f-9fgg"},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-29509","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2020-29509","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-29509","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210129-0006","tags":["web"]},{"url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1011","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-29509","tags":["report"]},{"url":"https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-29509","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:02:02.448Z","modified":"2024-09-17T03:43:39.703Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-115"],"updated_at":"2026-11-02T14:35:55.460269Z"}],"euvd":[{"id":"EUVD-2022-1254","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:02:02Z","modified":"2024-09-17T03:43:39Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:28:29.460274Z"}],"ghsa":[{"id":"GHSA-xhqq-x44f-9fgg","title":"Authentication Bypass in github.com/russellhaering/gosaml2","description":"### Impact\nGiven a valid SAML Response, it may be possible for an attacker to mutate the XML document in such a way that gosaml2 will trust a different portion of the document than was signed.\n\nDepending on the implementation of the Service Provider this enables a variety of attacks, including users accessing accounts other than the one to which they authenticated in the Identity Provider, or full authentication bypass.\n\n### Patches\nService Providers utilizing gosaml2 should upgrade to v0.6.0 or greater.","status":"published","published":"2022-02-11T23:58:09Z","modified":"2023-02-16T00:28:05Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-115"],"updated_at":"2026-11-02T14:36:45.67005Z"}],"nvd":[{"id":"CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13.06Z","modified":"2026-06-17T03:11:23.34Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-115"],"updated_at":"2026-11-02T14:06:27.73474Z"}],"osv":[{"id":"ALPINE-CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13.06Z","modified":"2026-11-03T06:32:37.261289039Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T07:17:20.312441Z"},{"id":"AZL-6448","title":"CVE-2020-29509 affecting package golang for versions less than 1.20.10-1","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13Z","modified":"2026-04-21T04:32:25.597017Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"AZL-78900","title":"CVE-2020-29509 affecting package golang 1.26.7-1","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13Z","modified":"2026-10-22T05:35:55Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:10.017343Z"},{"id":"BELL-CVE-2020-29509","title":"CVE-2020-29509 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:16:31.868064Z","modified":"2026-01-26T09:48:19.265281Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13.06Z","modified":"2026-10-24T10:30:56.401585045Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:16.612899Z"},{"id":"DEBIAN-CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:13.06Z","modified":"2026-08-27T13:02:31.061465156Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"GHSA-xhqq-x44f-9fgg","title":"Authentication Bypass in github.com/russellhaering/gosaml2","description":"### Impact\nGiven a valid SAML Response, it may be possible for an attacker to mutate the XML document in such a way that gosaml2 will trust a different portion of the document than was signed.\n\nDepending on the implementation of the Service Provider this enables a variety of attacks, including users accessing accounts other than the one to which they authenticated in the Identity Provider, or full authentication bypass.\n\n### Patches\nService Providers utilizing gosaml2 should upgrade to v0.6.0 or greater.","status":"published","published":"2022-02-11T23:58:09Z","modified":"2026-09-10T03:49:12.821542716Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-115"],"updated_at":"2026-11-02T15:47:00.198893Z"},{"id":"OESA-2021-1011","title":"golang security update","description":"The Go Programming Language.\\r\\n\\r\\n\r\nSecurity Fix(es):\\r\\n\\r\\n\r\nThe encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.(CVE-2020-29509)\\r\\n\\r\\n","status":"published","published":"2021-02-04T11:04:14Z","modified":"2026-08-18T01:15:08.999696265Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"UBUNTU-CVE-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2020-12-14T20:15:00Z","modified":"2025-10-24T04:48:56Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:54:24.541803Z"},{"id":"BIT-golang-2020-29509","description":"The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.","status":"published","published":"2024-03-06T11:07:09.71Z","modified":"2026-09-10T16:00:47.645228445Z","updated_at":"2026-11-02T15:28:30.70064Z"},{"id":"GO-2021-0060","title":"Authentication bypass in github.com/russellhaering/gosaml2","description":"Due to the behavior of encoding/xml, a crafted XML document may cause XML Digital Signature validation to be entirely bypassed, causing an unsigned document to appear signed.","status":"published","published":"2021-04-14T20:04:52Z","modified":"2026-02-04T04:13:59.892554Z","updated_at":"2026-11-02T15:47:00.604718Z"}]}}