Vulnerability-Lookup

CVE-2026-50161 (GCVE-0-2026-50161)

Vulnerability from cvelistv5 – Published: 2026-08-18 17:53 – Updated: 2026-08-19 15:11

Title

libre: Integer overflow in websock_decode() masked frame length check leads to heap buffer overflow

Summary

libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr->len can wrap when hdr->len is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 15:11 UTC

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7886 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/baresip/re/security/advisories…	x_refsource_CONFIRM
https://github.com/baresip/re/pull/1584	x_refsource_MISC
https://github.com/baresip/re/commit/718b92615c79…	x_refsource_MISC
https://github.com/baresip/re/releases/tag/v4.8.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
baresip	re	Affected: < 4.8.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-50161

Vulnerability from fkie_nvd - Published: 2026-08-18 18:17 - Updated: 2026-10-22 22:10

Severity

9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8
	security-advisories@github.com	https://github.com/baresip/re/pull/1584
	security-advisories@github.com	https://github.com/baresip/re/releases/tag/v4.8.1
	security-advisories@github.com	https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "re",
          "vendor": "baresip",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.8.1"
            }
          ]
        }
      ],
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    }
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    },
    {
      "lang": "es",
      "value": "libre es una biblioteca gen\u00e9rica para comunicaciones en tiempo real con soporte de entrada y salida as\u00edncrona. Antes de la 4.8.1, la funci\u00f3n websock_decode() en src/websock/websock.c contiene un desbordamiento de entero al validar una trama WebSocket enmascarada que utiliza la codificaci\u00f3n de longitud extendida de 64 bits. La expresi\u00f3n 4 + hdr  -\u003e  len puede desbordarse cuando hdr  -\u003e  len est\u00e1 cerca de UINT64_MAX, haciendo que la comprobaci\u00f3n de l\u00edmites de mbuf_get_left() pase. El bucle de desenmascaramiento XOR subsiguiente luego escribe m\u00e1s all\u00e1 del b\u00fafer de mont\u00f3n. Las aplicaciones que utilizan websock_accept() o websock_accept_proto() para implementar un servidor WebSocket se ven afectadas, y la explotaci\u00f3n puede causar corrupci\u00f3n de mont\u00f3n controlada por el atacante o denegaci\u00f3n de servicio despu\u00e9s del handshake de actualizaci\u00f3n HTTP WebSocket. Este problema est\u00e1 corregido en la versi\u00f3n 4.8.1."
    }
  ],
  "id": "CVE-2026-50161",
  "lastModified": "2026-10-22T22:10:00.250",
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          "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": "NONE",
          "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:N/UI:N/VC:H/VI:H/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": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-50161",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-19T15:11:03.181573Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T18:17:53.380",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/baresip/re/pull/1584"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/baresip/re/releases/tag/v4.8.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

UBUNTU-CVE-2026-50161 (CVE-2026-50161)

Vulnerability from osv_ubuntu – Published: 2026-08-18 18:17 – Updated: 2026-10-17 09:44 – Source website

Details

Severity

9.3 (Critical)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-50161	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-50161	REPORT
	https://github.com/baresip/re/security/advisories…	REPORT
	https://github.com/baresip/re/pull/1584	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre0",
            "binary_version": "0.4.14-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@0.4.14-4?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.14-1",
        "0.4.14-2",
        "0.4.14-3",
        "0.4.14-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre0",
            "binary_version": "0.5.6-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@0.5.6-1ubuntu2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.4-3ubuntu1",
        "0.5.5-1ubuntu1",
        "0.5.6-1ubuntu1",
        "0.5.6-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre0",
            "binary_version": "0.6.0-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@0.6.0-4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.0-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre0",
            "binary_version": "1.1.0-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@1.1.0-1build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-1",
        "1.1.0-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre0",
            "binary_version": "1.1.0-1build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@1.1.0-1build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-1build2",
        "1.1.0-1build3",
        "1.1.0-1build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre1",
            "binary_version": "2.0.1-3ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@2.0.1-3ubuntu1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1-3build1",
        "2.0.1-3ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libre1",
            "binary_version": "2.0.1-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libre",
        "purl": "pkg:deb/ubuntu/libre@2.0.1-3build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1-3",
        "2.0.1-3build1"
      ]
    }
  ],
  "aliases": [],
  "details": "libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr-\u003elen can wrap when hdr-\u003elen is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.",
  "id": "UBUNTU-CVE-2026-50161",
  "modified": "2026-10-17T09:44:21Z",
  "published": "2026-08-18T18:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-50161"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-50161"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/baresip/re/pull/1584"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-50161"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-50161 (GCVE-0-2026-50161)

FKIE_CVE-2026-50161

UBUNTU-CVE-2026-50161 (CVE-2026-50161)

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Nomenclature

Vulnerability timeline

Related by attack behaviour