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 7634 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: 2026-09-18 20:09

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",
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    }
  ],
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  "lastModified": "2026-09-18T20:09:01.757",
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    {
      "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: 2026-09-23 23:30 – 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": "2.0.1-3build1"
          }
        ]
      },
      "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": "2026-09-23T23:30:20Z",
  "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

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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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.
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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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