{"id":"CVE-2026-4539","aliases":["DEBIAN-CVE-2026-4539","EUVD-2026-14287","GHSA-5239-wwwm-4pmq","MGASA-2026-0090","OESA-2026-1873","PYSEC-2026-2987","SUSE-SU-2026:1666-1","SUSE-SU-2026:1667-1","SUSE-SU-2026:22058-1","SUSE-SU-2026:22093-1","UBUNTU-CVE-2026-4539","openSUSE-SU-2026:10476-1","openSUSE-SU-2026:20931-1"],"status":"published","title":"pygments archetype.py AdlLexer redos","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","severity":{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00162,"percentile":0.05474,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333","CWE-400"],"published":"2026-03-22T05:35:12Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"PyPI","package":"pygments","fixed_in":["2.20.0"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"pygments","fixed_in":["2.20.0+dfsg-1"],"sources":["osv"]},{"ecosystem":"Mageia:9","package":"python-pygments","fixed_in":["2.15.1-1.1.mga9"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"python-pygments","fixed_in":["2.17.2-2.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP2","package":"python-pygments","fixed_in":["2.17.2-2.oe2403sp2"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP3","package":"python-pygments","fixed_in":["2.17.2-2.oe2403sp3"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP4","package":"python-pygments","fixed_in":["2.5.2-7.oe2003sp4"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"python-pygments","fixed_in":["2.10.0-5.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS","package":"python-pygments","fixed_in":["2.17.2-2.oe2403"],"sources":["osv"]},{"ecosystem":"SUSE:Linux 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16.0","package":"python-Pygments","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.19.1-160000.3.1"}]}]}],"references":[{"url":"https://vuldb.com/?id.352327","tags":["vdb-entry","technical-description","advisory","web","report"]},{"url":"https://vuldb.com/?ctiid.352327","tags":["signature","permissions-required","report","web"]},{"url":"https://vuldb.com/?submit.774685","tags":["third-party-advisory","advisory","web","report"]},{"url":"https://github.com/pygments/pygments/issues/3058","tags":["exploit","issue-tracking","report","web"]},{"url":"https://github.com/pygments/pygments/","tags":["product","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4539","tags":["advisory"]},{"url":"https://github.com/pygments/pygments","tags":["package"]},{"url":"https://github.com/pygments/pygments/pull/3064","tags":["web"]},{"url":"https://github.com/pygments/pygments/commit/24b8aa76c6cd6d70f39c6dd605cce319c98e2ccc","tags":["web"]},{"url":"https://github.com/pygments/pygments/releases/tag/2.20.0","tags":["web"]},{"url":"https://github.com/advisories/GHSA-5239-wwwm-4pmq","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4539.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-4539","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0090.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35318","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/EBSMTYMFOHFBVTCLFPVRVEOWXXCIDDMI/","tags":["web"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1873","tags":["advisory"]},{"url":"https://pypi.org/project/pygments","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261666-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1260796","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-4539","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261667-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622058-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622093-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-4539","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-4539","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-4539","title":"pygments archetype.py AdlLexer redos","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T05:35:12.096Z","modified":"2026-03-23T16:08:49.809Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR","assessor":"cna"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-02T14:19:59.369956Z"}],"euvd":[{"id":"EUVD-2026-14287","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T05:35:12Z","modified":"2026-03-23T16:08:49Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T19:25:31.168902Z"}],"ghsa":[{"id":"GHSA-5239-wwwm-4pmq","title":"Pygments has Regular Expression Denial of Service (ReDoS) due to Inefficient Regex for GUID Matching","description":"A security flaw has been discovered in pygments before 2.20.0. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T06:30:15Z","modified":"2026-03-30T14:40:30Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:39:46.119458Z"}],"nvd":[{"id":"CVE-2026-4539","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T06:16:20.913Z","modified":"2026-06-17T10:56:46.69Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P","level":"low","assessor":"secondary"}],"cwes":["CWE-400","CWE-1333"],"updated_at":"2026-11-02T14:12:10.126802Z"}],"osv":[{"id":"CVE-2026-4539","title":"pygments archetype.py AdlLexer redos","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T05:35:12.096Z","modified":"2026-10-28T02:30:57.407953705Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-02T15:45:05.525666Z"},{"id":"DEBIAN-CVE-2026-4539","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T06:16:20.913Z","modified":"2026-10-01T03:03:14.772580089Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:55.669088Z"},{"id":"GHSA-5239-wwwm-4pmq","title":"Pygments has Regular Expression Denial of Service (ReDoS) due to Inefficient Regex for GUID Matching","description":"A security flaw has been discovered in pygments before 2.20.0. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T06:30:15Z","modified":"2026-09-10T03:50:59.780634752Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-1333","CWE-400"],"updated_at":"2026-11-02T15:46:37.528068Z"},{"id":"OESA-2026-1873","title":"python-pygments security update","description":"\\\r\n\r\nSecurity Fix(es):\n\nA security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.(CVE-2026-4539)","status":"published","published":"2026-04-11T11:10:53Z","modified":"2026-08-18T01:19:47.034144207Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:46.087701Z"},{"id":"PYSEC-2026-2987","title":"Pygments has Regular Expression Denial of Service (ReDoS) due to Inefficient Regex for GUID Matching","description":"A security flaw has been discovered in pygments before 2.20.0. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-07-13T14:36:44.333679Z","modified":"2026-07-13T16:32:42.87054484Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"updated_at":"2026-11-02T15:52:56.429374Z"},{"id":"UBUNTU-CVE-2026-4539","description":"A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.","status":"published","published":"2026-03-22T06:16:00Z","modified":"2026-10-17T12:58:22.968640629Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"updated_at":"2026-11-02T16:56:26.396868Z"},{"id":"MGASA-2026-0090","title":"Updated python-pygments packages fix security vulnerability","description":"A security flaw in Pygments function AdlLexer in archetype.py stems from\na regular expression having an inefficient, possibly exponential worst-case\ncomputational complexity that consumes excessive CPU cycles. (CVE-2026-4539)\n","status":"published","published":"2026-04-08T02:49:21Z","modified":"2026-04-16T04:42:56.809333557Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2026:10476-1","title":"python311-Pygments-2.20.0-2.1 on GA media","description":"These are all security issues fixed in the python311-Pygments-2.20.0-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-04-01T00:00:00Z","modified":"2026-04-02T13:30:59.993064Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:20931-1","title":"Security update for python-Pygments","description":"This update for python-Pygments fixes the following issue:\n\n- CVE-2026-4539: Denial of Service via inefficient regular expression processing in AdlLexer (bsc#1260796).\n","status":"published","published":"2026-06-09T22:37:40Z","modified":"2026-06-13T18:24:18.668551288Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:1666-1","title":"Security update for python-Pygments","description":"This update for python-Pygments fixes the following issues:\n\n- CVE-2026-4539: inefficient regex for GUID and ID pattern matching can lead to archetype lexer ReDoS (bsc#1260796).\n","status":"published","published":"2026-04-30T17:22:16Z","modified":"2026-05-02T08:00:06.850659Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:1667-1","title":"Security update for python-Pygments","description":"This update for python-Pygments fixes the following issues:\n\n- CVE-2026-4539: inefficient regex for GUID and ID pattern matching can lead to archetype lexer ReDoS (bsc#1260796).\n","status":"published","published":"2026-04-30T17:22:44Z","modified":"2026-05-02T08:00:11.493255Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:22058-1","title":"Security update for python-Pygments","description":"This update for python-Pygments fixes the following issue:\n\n- CVE-2026-4539: Denial of Service via inefficient regular expression processing in AdlLexer (bsc#1260796).\n","status":"published","published":"2026-06-09T22:37:38Z","modified":"2026-06-13T18:24:16.935183509Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:22093-1","title":"Security update for python-Pygments","description":"This update for python-Pygments fixes the following issue:\n\n- CVE-2026-4539: Denial of Service via inefficient regular expression processing in AdlLexer (bsc#1260796).\n","status":"published","published":"2026-06-09T22:37:38Z","modified":"2026-06-16T18:24:39.810243483Z","updated_at":"2026-11-02T15:54:02.654057Z"}]}}