CVE-2026-57188

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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."}], "source": {"advisory": "GHSA-mxgm-8c6f-5p8f", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-30T20:22:47.977672Z", "id": "CVE-2026-57188", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-30T20:22:55.339Z"}}]}}

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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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-27T17:55:29.170Z"}}}, "cveMetadata": {"cveId": "CVE-2026-57188", "state": "PUBLISHED", "dateUpdated": "2026-10-30T20:22:55.339Z", "dateReserved": "2026-06-24T02:00:46.799Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-10-27T17:55:29.170Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

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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."}], "id": "CVE-2026-57188", "lastModified": "2026-10-30T21:16:58.700", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-57188", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-30T20:22:47.977672Z", "version": "2.0.3"}}]}, "published": "2026-10-27T18:17:37.367", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/20.20.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/21.12.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/22.10.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/23.4.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f"}, {"source": "security-advisories@github.com", "url": "https://github.com/asterisk/asterisk/tree/24.0.0-pre1"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "asterisk: Asterisk: Denial of Service via stack buffer overflow in res_xmpp", "id": "2562317", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562317"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["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 `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.", "A flaw was found in Asterisk. This vulnerability allows an authenticated remote attacker to cause a Denial of Service (DoS) by sending specially crafted network packets to the res_xmpp module. When processing Extensible Messaging and Presence Protocol (XMPP) namespace prefixes from a local or federated account, a stack-based buffer overflow is triggered, causing the application to crash."], "name": "CVE-2026-57188", "public_date": "2026-10-27T17:55:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-57188\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-57188\nhttps://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4\nhttps://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84\nhttps://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13\nhttps://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923\nhttps://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b\nhttps://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1\nhttps://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08\nhttps://github.com/asterisk/asterisk/releases/tag/20.20.1\nhttps://github.com/asterisk/asterisk/releases/tag/21.12.3\nhttps://github.com/asterisk/asterisk/releases/tag/22.10.1\nhttps://github.com/asterisk/asterisk/releases/tag/23.4.1\nhttps://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11\nhttps://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3\nhttps://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f\nhttps://github.com/asterisk/asterisk/tree/24.0.0-pre1"], "statement": "This vulnerability is rated as having a Moderate impact because exploitation is limited to a denial of service and requires an attacker to possess valid credentials on a local or federated XMPP server. While the memory corruption leads to an application termination, it cannot be initiated by an unauthenticated attacker. In deployments where the `res_xmpp` module is not loaded or configured, Asterisk instances remain unaffected by this defect.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,20.20.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[21.0.0-pre1,21.12.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.0.0-pre1,22.10.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[23.0.0-pre1,23.4.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "asterisk", "source": "cna", "vendor": "asterisk"}, "product": "asterisk", "vendor": "asterisk"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "< 20.7-cert11"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": ">= 22.8-cert1-pre1, < 22.8-cert3"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "certified-asterisk", "source": "cna", "vendor": "asterisk"}, "product": "certified_asterisk", "vendor": "asterisk"}], "created": "2026-10-27T19:45:07.216625+00:00", "updated": "2026-10-27T21:15:08.700188+00:00", "vendors": ["asterisk", "asterisk$PRODUCT$asterisk", "asterisk$PRODUCT$certified_asterisk"]}