← Back to CVE Explorer

CVE-2026-49759

Full vulnerability record from the local CVENow database.

Description

Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk. The sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c parses SCTP ERROR chunks and writes cause codes into a fixed-size stack-allocated ErlDrvTermData spec[] array without checking bounds. A remote attacker who has established an SCTP association to a listening port can send a single crafted SCTP ERROR chunk containing enough cause codes to overflow the stack buffer, crashing the VM. The attacker can only write 16-bit values interleaved with a fixed tag, so the overflow does not provide a controlled return address, limiting exploitation to Denial of Service. A crafted SCTP ERROR chunk may also leak bits and pieces of Erlang VM memory into the received error packet observed by the Erlang process. Such data is already readable by the user running the Erlang VM, so the disclosure scope is limited. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to erts from 6.0 before 15.2.7.9, 16.4.0.2, and 17.0.2. Whether OTP before OTP 17.0, corresponding to erts before 6.0, is affected is unknown.

Severity
HIGH
CVSS score
8.8 (v4.0)
Vulnerability status
Modified
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-06-10 16:17:12.797000
Last modified
2026-10-26 11:10:00.157000
View original CVE JSON 
{
  "id": "CVE-2026-49759",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-06-10T16:17:12.797",
  "lastModified": "2026-10-26T11:10:00.157",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk.\n\nThe sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c parses SCTP ERROR chunks and writes cause codes into a fixed-size stack-allocated ErlDrvTermData spec[] array without checking bounds. A remote attacker who has established an SCTP association to a listening port can send a single crafted SCTP ERROR chunk containing enough cause codes to overflow the stack buffer, crashing the VM. The attacker can only write 16-bit values interleaved with a fixed tag, so the overflow does not provide a controlled return address, limiting exploitation to Denial of Service.\n\nA crafted SCTP ERROR chunk may also leak bits and pieces of Erlang VM memory into the received error packet observed by the Erlang process. Such data is already readable by the user running the Erlang VM, so the disclosure scope is limited.\n\nThis issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to erts from 6.0 before 15.2.7.9, 16.4.0.2, and 17.0.2. Whether OTP before OTP 17.0, corresponding to erts before 6.0, is affected is unknown."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de desbordamiento de búfer basado en pila en Erlang OTP erts (inet_drv) permite a un atacante remoto no autenticado bloquear la VM BEAM enviando un fragmento SCTP ERROR manipulado.\n\nLa función sctp_parse_error_chunk en erts/emulator/drivers/common/inet_drv.c analiza fragmentos SCTP ERROR y escribe códigos de causa en un array ErlDrvTermData spec[] de tamaño fijo asignado en pila sin comprobar los límites. Un atacante remoto que ha establecido una asociación SCTP a un puerto de escucha puede enviar un único fragmento SCTP ERROR manipulado que contenga suficientes códigos de causa para desbordar el búfer de pila, bloqueando la VM. El atacante solo puede escribir valores de 16 bits intercalados con una etiqueta fija, por lo que el desbordamiento no proporciona una dirección de retorno controlada, limitando la explotación a Denegación de Servicio.\n\nUn fragmento SCTP ERROR manipulado también puede filtrar fragmentos de memoria de la VM de Erlang en el paquete de error recibido observado por el proceso Erlang. Dichos datos ya son legibles por el usuario que ejecuta la VM de Erlang, por lo que el alcance de la divulgación es limitado.\n\nEste problema afecta a OTP desde OTP 17.0 antes de 27.3.4.13, 28.5.0.2 y 29.0.2, correspondiente a erts desde 6.0 antes de 15.2.7.9, 16.4.0.2 y 17.0.2."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "Erlang",
          "product": "OTP",
          "defaultStatus": "unknown",
          "packageName": "otp",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "inet_drv"
          ],
          "programFiles": [
            "erts/emulator/drivers/common/inet_drv.c"
          ],
          "programRoutines": [
            {
              "name": "sctp_parse_error_chunk"
            }
          ],
          "packageURL": "pkg:software-id/erlang.org/otp",
          "versions": [
            {
              "version": "17.0",
              "lessThan": "*",
              "versionType": "otp",
              "status": "affected",
              "changes": [
                {
                  "at": "27.3.4.13",
                  "status": "unaffected"
                },
                {
                  "at": "28.5.0.2",
                  "status": "unaffected"
                },
                {
                  "at": "29.0.2",
                  "status": "unaffected"
                }
              ]
            }
          ]
        },
        {
          "vendor": "Erlang",
          "product": "OTP",
          "defaultStatus": "unknown",
          "packageName": "erts",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "inet_drv"
          ],
          "programFiles": [
            "emulator/drivers/common/inet_drv.c"
          ],
          "programRoutines": [
            {
              "name": "sctp_parse_error_chunk"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "packageURL": "pkg:otp/erts?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "versions": [
            {
              "version": "6.0",
              "lessThan": "*",
              "versionType": "otp",
              "status": "affected",
              "changes": [
                {
                  "at": "15.2.7.9",
                  "status": "unaffected"
                },
                {
                  "at": "16.4.0.2",
                  "status": "unaffected"
                },
                {
                  "at": "17.0.2",
                  "status": "unaffected"
                }
              ]
            }
          ]
        },
        {
          "vendor": "Erlang",
          "product": "OTP",
          "defaultStatus": "unknown",
          "collectionURL": "https://github.com",
          "packageName": "erlang/otp",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "inet_drv"
          ],
          "programFiles": [
            "erts/emulator/drivers/common/inet_drv.c"
          ],
          "programRoutines": [
            {
              "name": "sctp_parse_error_chunk"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "packageURL": "pkg:github/erlang/otp",
          "versions": [
            {
              "version": "84adefa331c4159d432d22840663c38f155cd4c1",
              "lessThan": "3983d495284331c121f600a80bac9fcf4e16381e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3983d495284331c121f600a80bac9fcf4e16381e",
              "lessThan": "*",
              "versionType": "git",
              "status": "unaffected"
            }
          ]
        }
      ]
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "affectedData": [
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 16.2",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "erlang",
          "cpes": [
            "cpe:/a:redhat:openstack:16.2"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 17.1",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "erlang",
          "cpes": [
            "cpe:/a:redhat:openstack:17.1"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenStack Platform 18.0",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "erlang",
          "cpes": [
            "cpe:/a:redhat:openstack:18.0"
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2
      },
      {
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-10T16:18:27.945916Z",
          "id": "CVE-2026-49759",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ]
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "17.0",
              "versionEndExcluding": "27.3.4.13",
              "matchCriteriaId": "BF42A5F2-4C27-43FE-B5FA-17A3422B9649"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "28.0",
              "versionEndExcluding": "28.5.0.2",
              "matchCriteriaId": "902ED4C3-B9DE-4ABC-9BEA-D23DA4F5D373"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "29.0",
              "versionEndExcluding": "29.0.2",
              "matchCriteriaId": "F4AB1573-4E81-4338-B65A-B3C94C7249FA"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.0",
              "versionEndExcluding": "15.2.7.9",
              "matchCriteriaId": "EAB60C9A-F1B2-4377-8C9B-B8496D3D9B5C"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "16.0",
              "versionEndExcluding": "16.4.0.2",
              "matchCriteriaId": "0778AFBA-F21F-4394-AA3A-38784D379BEB"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:erlang:erts:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "17.0",
              "versionEndExcluding": "17.0.2",
              "matchCriteriaId": "05F0E6B1-0DA3-4A0B-8C89-8DFC55EC7C8B"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-49759.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://github.com/erlang/otp/commit/3983d495284331c121f600a80bac9fcf4e16381e",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/erlang/otp/security/advisories/GHSA-6f4f-chj5-5g97",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-49759",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Product"
      ]
    },
    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-49759",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487607",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    },
    {
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49759.json",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ]
}