{"id":"CVE-2021-40839","aliases":["ALPINE-CVE-2021-40839","DEBIAN-CVE-2021-40839","EUVD-2021-0222","GHSA-gh8j-2pgf-x458","MGASA-2022-0167","PYSEC-2021-345","UBUNTU-CVE-2021-40839"],"status":"published","title":"Infinite Loop in rencode","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and 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Party Advisory","fix","web","report"]},{"url":"https://seclists.org/fulldisclosure/2021/Sep/16","tags":["x_refsource_MISC","x_transferred","Mailing List","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web","report"]},{"url":"https://pypi.org/project/rencode/#history","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web","package","report"]},{"url":"https://security.netapp.com/advisory/ntap-20211008-0001/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40839","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gh8j-2pgf-x458","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/rencode/PYSEC-2021-345.yaml","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY","tags":["web"]},{"url":"https://security.netapp.com/advisory/ntap-20211008-0001","tags":["web"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-40839","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-40839","tags":["advisory"]},{"url":"https://github.com/aresch/rencode","tags":["package"]},{"url":"https://advisories.mageia.org/MGASA-2022-0167.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=30051","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-40839","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-40839","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-40839","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.","status":"published","published":"2021-09-10T01:03:33Z","modified":"2024-08-04T02:51:07.399Z","updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-0222","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.","status":"published","published":"2021-09-10T01:03:33Z","modified":"2024-08-04T02:51:07Z","updated_at":"2026-11-03T03:24:19.692229Z"}],"ghsa":[{"id":"GHSA-gh8j-2pgf-x458","title":"Infinite Loop in rencode","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and 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memory.","status":"published","published":"2021-09-10T02:15:07.933Z","modified":"2026-06-17T04:07:30.927Z","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","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"ALPINE-CVE-2021-40839","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.","status":"published","published":"2021-09-10T02:15:07.933Z","modified":"2026-11-03T06:32:41.200147042Z","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":"2026-11-03T07:17:02.90744Z"},{"id":"CVE-2021-40839","description":"The rencode package through 1.0.6 for Python allows an infinite loop in 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packages fix security vulnerability","description":"The rencode package through 1.0.6 for Python allows an infinite loop in\ntypecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that\nconsumes CPU and memory. (CVE-2021-40839)\n","status":"published","published":"2022-05-12T10:24:45Z","modified":"2026-04-16T04:42:49.355357922Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"PYSEC-2021-345","description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.","status":"published","published":"2021-09-10T02:15:00Z","modified":"2025-10-09T07:29:23.400797Z","updated_at":"2026-11-02T15:52:52.682031Z"}]}}