Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch

{
  "id": "64d7186a450f19452869b47f77ff924c3961965d47122824244d8f4f9b6566c6",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-57192",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch",
    "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 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.",
    "evidence": "cve:CVE-2026-57192",
    "products": [
      {
        "name": {
          "value": "asterisk",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "certified-asterisk",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-57192",
      "aliases": [
        "CVE-2026-57192"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6,
            "attackVector": "NETWORK",
            "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",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "LOW",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "asterisk",
          "product": "asterisk",
          "versions": [
            {
              "status": "affected",
              "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"
            }
          ]
        },
        {
          "vendor": "asterisk",
          "product": "certified-asterisk",
          "versions": [
            {
              "status": "affected",
              "version": "< 20.7-cert11"
            },
            {
              "status": "affected",
              "version": ">= 22.8-cert1-pre1, < 22.8-cert3"
            }
          ]
        }
      ],
      "modified": "2026-10-27T21:25:40.363Z",
      "provider": "cve",
      "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"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-27T21:25:40.363Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57192",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 400584,
  "published_at": "2026-10-27T21:25:40.363+00:00"
}