{"id":"CVE-2026-57192","state":"PUBLISHED","title":"Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch","description":"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 heap buffer overflow through an out-of-bounds write in the `Codec2` decoder caused by a `floor/ceil sample-count mismatch`. The `codec_codec2` module must be loaded and `Codec2` must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or `source IP address matching`, establish a call using `Codec2`, and send carefully crafted `Codec2` audio packets. 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.","publishedAt":"2026-10-27T21:25:40.363Z","updatedAt":"2026-10-27T21:25:40.363Z","severity":{"score":6,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["asterisk asterisk","asterisk certified-asterisk"],"affected":[{"vendor":"asterisk","product":"asterisk","versions":[{"version":"< 20.20.1","status":"affected"},{"version":">= 21.0.0-pre1, < 21.12.3","status":"affected"},{"version":">= 22.0.0-pre1, < 22.10.1","status":"affected"},{"version":">= 23.0.0-pre1, < 23.4.1","status":"affected"}]},{"vendor":"asterisk","product":"certified-asterisk","versions":[{"version":"< 20.7-cert11","status":"affected"},{"version":">= 22.8-cert1-pre1, < 22.8-cert3","status":"affected"}]}],"references":["https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx","https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079","https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56","https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acb","https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398","https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434c","https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0d","https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006","https://github.com/asterisk/asterisk/releases/tag/20.20.1","https://github.com/asterisk/asterisk/releases/tag/21.12.3","https://github.com/asterisk/asterisk/releases/tag/22.10.1","https://github.com/asterisk/asterisk/releases/tag/23.4.1","https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11","https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3","https://github.com/asterisk/asterisk/tree/24.0.0-pre1"],"weaknesses":["CWE-125","CWE-131","CWE-787"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/57xxx/CVE-2026-57192.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-57192","state":"PUBLISHED","datePublished":"2026-10-27T21:25:40.363Z","dateUpdated":"2026-10-27T21:25:40.363Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-24T02:00:46.800Z"},"containers":{"cna":{"title":"Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch","descriptions":[{"lang":"en","value":"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 heap buffer overflow through an out-of-bounds write in the `Codec2` decoder caused by a `floor/ceil sample-count mismatch`. The `codec_codec2` module must be loaded and `Codec2` must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or `source IP address matching`, establish a call using `Codec2`, and send carefully crafted `Codec2` audio packets. 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."}],"affected":[{"vendor":"asterisk","product":"asterisk","versions":[{"version":"< 20.20.1","status":"affected"},{"version":">= 21.0.0-pre1, < 21.12.3","status":"affected"},{"version":">= 22.0.0-pre1, < 22.10.1","status":"affected"},{"version":">= 23.0.0-pre1, < 23.4.1","status":"affected"}]},{"vendor":"asterisk","product":"certified-asterisk","versions":[{"version":"< 20.7-cert11","status":"affected"},{"version":">= 22.8-cert1-pre1, < 22.8-cert3","status":"affected"}]}],"references":[{"url":"https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx","name":"https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079","name":"https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56","name":"https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acb","name":"https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acb","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398","name":"https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434c","name":"https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434c","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0d","name":"https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0d","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006","name":"https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/20.20.1","name":"https://github.com/asterisk/asterisk/releases/tag/20.20.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/21.12.3","name":"https://github.com/asterisk/asterisk/releases/tag/21.12.3","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/22.10.1","name":"https://github.com/asterisk/asterisk/releases/tag/22.10.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/23.4.1","name":"https://github.com/asterisk/asterisk/releases/tag/23.4.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11","name":"https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3","name":"https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3","tags":["x_refsource_MISC"]},{"url":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1","name":"https://github.com/asterisk/asterisk/tree/24.0.0-pre1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-131","lang":"en","description":"CWE-131: Incorrect Calculation of Buffer Size","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787: Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-27T21:25:40.363Z"},"source":{"advisory":"GHSA-qf8j-jp7h-c5hx","discovery":"UNKNOWN"}}}}}