{"id":"CVE-2026-57188","title":"Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling","summary":"Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a stack buffer overflow in …","severity":"high","cvss":7.1,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-787"],"vendor":"asterisk","product":"asterisk","affected":["asterisk < 20.20.1","asterisk >= 21.0.0-pre1, < 21.12.3","asterisk >= 22.0.0-pre1, < 22.10.1","asterisk >= 23.0.0-pre1, < 23.4.1","certified-asterisk < 20.7-cert11","certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T17:55:29.170Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57188","references":[{"url":"https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f","label":"https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f"},{"url":"https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4","label":"https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4"},{"url":"https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84","label":"https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84"},{"url":"https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13","label":"https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13"},{"url":"https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923","label":"https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923"},{"url":"https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b","label":"https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b"},{"url":"https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1","label":"https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1"},{"url":"https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08","label":"https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08"},{"url":"https://github.com/asterisk/asterisk/releases/tag/20.20.1","label":"https://github.com/asterisk/asterisk/releases/tag/20.20.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/21.12.3","label":"https://github.com/asterisk/asterisk/releases/tag/21.12.3"},{"url":"https://github.com/asterisk/asterisk/releases/tag/22.10.1","label":"https://github.com/asterisk/asterisk/releases/tag/22.10.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/23.4.1","label":"https://github.com/asterisk/asterisk/releases/tag/23.4.1"},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11","label":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11"},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3","label":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3"},{"url":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1","label":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T18:12:09.363Z","slug":"CVE-2026-57188","body":"## Overview\n\nAsterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a stack buffer overflow in `res_xmpp` `XMPP namespace prefix` handling using carefully crafted packets. The `res_xmpp` module must be loaded, an XMPP connection must be configured in `xmpp.conf`, and the attacker must have an XMPP account on the same or a federated server. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.\n\n## Affected\n\n- `asterisk < 20.20.1`\n- `asterisk >= 21.0.0-pre1, < 21.12.3`\n- `asterisk >= 22.0.0-pre1, < 22.10.1`\n- `asterisk >= 23.0.0-pre1, < 23.4.1`\n- `certified-asterisk < 20.7-cert11`\n- `certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}