Vulnerability-Lookup

OESA-2026-4076 (CVE-2026-19773)

Vulnerability from osv_openeuler – Published: 2026-09-25 01:28 – Updated: 2026-09-25 01:28 – Source website

Summary

libwebsockets security update

Details

Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.

Security Fix(es):

The specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31036.(CVE-2026-19773)

A vulnerability classified as critical was found in warmcat libwebsockets 4.5.0. The vulnerability is in the function report_raw_cbor in lib/misc/lecp.c when handling LECP CBOR recordings. This issue allows an out-of-bounds write (CWE-787), which could affect confidentiality, integrity, and availability. A proof-of-concept exploit is available.(CVE-2026-78161)

Severity

7.3 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-19773	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-78161	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-8.oe2403sp1.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp1.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp1.aarch64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-8.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-8.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-8.oe2403sp1.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp1.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp1.x86_64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-8.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-8.oe2403sp3.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp3.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp3.aarch64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-8.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-8.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-8.oe2403sp3.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp3.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp3.x86_64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-8.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.3-8.oe2403sp4.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp4.aarch64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp4.aarch64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp4.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.3-8.oe2403sp4.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.3-8.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.3-8.oe2403sp4.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.3-8.oe2403sp4.x86_64.rpm",
          "libwebsockets-debugsource-4.3.3-8.oe2403sp4.x86_64.rpm",
          "libwebsockets-devel-4.3.3-8.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-8.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libwebsockets-4.3.0-11.oe2003sp4.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.0-11.oe2003sp4.aarch64.rpm",
          "libwebsockets-debugsource-4.3.0-11.oe2003sp4.aarch64.rpm",
          "libwebsockets-devel-4.3.0-11.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.0-11.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.0-11.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.0-11.oe2003sp4.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.0-11.oe2003sp4.x86_64.rpm",
          "libwebsockets-debugsource-4.3.0-11.oe2003sp4.x86_64.rpm",
          "libwebsockets-devel-4.3.0-11.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
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        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
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              "fixed": "4.3.0-11.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libwebsockets-4.3.0-11.oe2203sp4.aarch64.rpm",
          "libwebsockets-debuginfo-4.3.0-11.oe2203sp4.aarch64.rpm",
          "libwebsockets-debugsource-4.3.0-11.oe2203sp4.aarch64.rpm",
          "libwebsockets-devel-4.3.0-11.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "libwebsockets-help-4.3.0-11.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "libwebsockets-4.3.0-11.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libwebsockets-4.3.0-11.oe2203sp4.x86_64.rpm",
          "libwebsockets-debuginfo-4.3.0-11.oe2203sp4.x86_64.rpm",
          "libwebsockets-debugsource-4.3.0-11.oe2203sp4.x86_64.rpm",
          "libwebsockets-devel-4.3.0-11.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "libwebsockets",
        "purl": "pkg:rpm/openEuler/libwebsockets\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.0-11.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Libwebsockets (LWS) is a flexible, lightweight pure C library for implementing modern network protocols easily with a tiny footprint, using a nonblocking event loop.\r\n\r\nSecurity Fix(es):\n\nlibwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31036.(CVE-2026-19773)\n\nA vulnerability classified as critical was found in warmcat libwebsockets 4.5.0. The vulnerability is in the function report_raw_cbor in lib/misc/lecp.c when handling LECP CBOR recordings. This issue allows an out-of-bounds write (CWE-787), which could affect confidentiality, integrity, and availability. A proof-of-concept exploit is available.(CVE-2026-78161)",
  "id": "OESA-2026-4076",
  "modified": "2026-09-25T01:28:08Z",
  "published": "2026-09-25T01:28:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4076"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19773"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78161"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libwebsockets security update",
  "upstream": [
    "CVE-2026-19773",
    "CVE-2026-78161"
  ]
}

CVE-2026-19773 (GCVE-0-2026-19773)

Vulnerability from cvelistv5 – Published: 2026-09-15 18:01 – Updated: 2026-09-16 03:57

Title

libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

Summary

libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-31036.

Severity

9.8 (Critical)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 00:00 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

zdi mitre root Scorecard

References

2 references

URL	Tags
https://www.zerodayinitiative.com/advisories/ZDI-…	x_research-advisory
https://github.com/warmcat/libwebsockets/commit/8…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
libwebsockets	libwebsockets	Affected: b4b5aed3903eaff09cd76a410f69bbe5dff66f8e

Date Public

2026-08-24 21:16

Show details on NVD website

JSON

To clipboard

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CVE-2026-78161 (GCVE-0-2026-78161)

Vulnerability from cvelistv5 – Published: 2026-08-24 00:45 – Updated: 2026-08-24 17:22 X_Open Source

Title

warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write

Summary

A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.

Severity

6.9 (Medium)


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

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

7.3 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-24 17:19 UTC

CWE

CWE-787 - Out-of-bounds Write
CWE-119 - Memory Corruption

Assigner

VulDB mitre root Scorecard

References

8 references

URL	Tags
https://vuldb.com/vuln/394543	vdb-entrytechnical-description
https://vuldb.com/vuln/394543/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-78161	third-party-advisory
https://vuldb.com/submit/883225	third-party-advisory
https://github.com/biniamf/pocs/tree/main/libwebs…	exploit
https://github.com/biniamf/pocs/blob/main/libwebs…	exploit
https://github.com/warmcat/libwebsockets/commit/1…	patch
https://github.com/warmcat/libwebsockets/	product

Impacted products

1 product

Vendor	Product	Version
warmcat	libwebsockets	Affected: 4.5.0 cpe:2.3:a:warmcat:libwebsockets::::::::

Credits

biniam (VulDB User)

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-78161",
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        },
        {
          "name": "CVE-2026-78161 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-78161"
        },
        {
          "name": "Submit #883225 | warmcat libwebsockets 4.5.99-v4.5.0-508-gb4b5aed39 Out-of-bounds Write",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/883225"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/biniamf/pocs/tree/main/libwebsockets-lecp-lecp_parse-cbor_pos_oob_write"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/biniamf/pocs/blob/main/libwebsockets-lecp-lecp_parse-cbor_pos_oob_write/poc_lecp_cbor_pos_oob.c"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/warmcat/libwebsockets/commit/1d44554a1bb262db63ff4e240152a9deecd99054"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/warmcat/libwebsockets/"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-23T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-08-23T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-08-23T13:58:25.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write",
      "x_generator": [
        "VulDB PVTS v202608"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-78161",
    "datePublished": "2026-08-24T00:45:08.842Z",
    "dateReserved": "2026-08-23T11:53:19.761Z",
    "dateUpdated": "2026-08-24T17:22:31.257Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

Action not permitted

OESA-2026-4076 (CVE-2026-19773)

CVE-2026-19773 (GCVE-0-2026-19773)

CVE-2026-78161 (GCVE-0-2026-78161)

Tags

Sightings

Nomenclature

Related by attack behaviour