{"id":"CVE-2020-36426","aliases":["DEBIAN-CVE-2020-36426","DLA-3249-1","EUVD-2020-23954","GHSA-jw2m-7hxw-f6q8","JLSEC-2025-209","UBUNTU-CVE-2020-36426"],"status":"published","title":"An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer...","description":"An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one byte).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01687,"percentile":0.7733,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-125"],"published":"2021-07-19T00:00:00Z","modified":"2026-10-26T12:02:49Z","fixes":[{"ecosystem":"Debian:12","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Julia","package":"MbedTLS_jll","fixed_in":["2.16.8+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0~deb10u1"}]}],"versions":["2.16.0-1","2.16.2-1","2.16.3-1","2.16.4-1","2.16.5-1"],"bundled":18},{"source":"osv","ecosystem":"Julia","package":"MbedTLS_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.16.8+0"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-1","2.2.0-1","2.2.1-1","2.2.1-2","2.2.1-2ubuntu0.1","2.2.1-2ubuntu0.2","2.2.1-2ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1ubuntu1","2.6.0-1","2.7.0-2","2.8.0-1","2.8.0-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.2-1","2.16.3-1","2.16.4-1ubuntu2","2.16.4-1ubuntu2+esm1"]}],"products":[{"vendor":"arm","product":"mbed_tls"},{"vendor":"debian","product":"debian_linux"}],"references":[{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://bugs.gentoo.org/740108","tags":["x_transferred","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html","tags":["mailing-list","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36426"},{"url":"https://github.com/advisories/GHSA-jw2m-7hxw-f6q8"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-36426","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-36426","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-36426","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-36426","description":"An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one byte).","status":"published","published":"2021-07-19T00:00:00Z","modified":"2024-08-04T17:30:07.29Z","updated_at":"2026-11-02T14:35:55.128961Z"}],"euvd":[{"id":"EUVD-2020-23954","description":"An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one 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byte).","status":"published","published":"2021-07-19T17:15:11.367Z","modified":"2026-10-26T12:02:49.170485582Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"JLSEC-2025-209","title":"An issue was discovered in Arm Mbed TLS before 2.24.0","description":"An issue was discovered in Arm Mbed TLS before 2.24.0. `mbedtls_x509_crl_parse_der` has a buffer over-read (of one byte).","status":"published","published":"2025-11-21T15:59:04.054Z","modified":"2026-07-23T22:30:18.910376418Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:47:17.805107Z"},{"id":"UBUNTU-CVE-2020-36426","description":"An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one 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