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HighFix available

libwebsockets security update

Type: advisorySource: OSV1 source record

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): 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.(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)

Announced Group revision 1
Original source ↗

OESA-2026-4076

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:OESA-2026-4076

libwebsockets

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
4.3.3-8.oe2403sp1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

libwebsockets

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
4.3.3-8.oe2403sp3

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

libwebsockets

Source reference: /affected/2/package/name

Affected versions
Not stated in this record
Fixed versions
4.3.3-8.oe2403sp4

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

libwebsockets

Source reference: /affected/3/package/name

Affected versions
Not stated in this record
Fixed versions
4.3.0-11.oe2003sp4

Source reference: /affected/3/ranges

Prerequisites
Not stated in this record

libwebsockets

Source reference: /affected/4/package/name

Affected versions
Not stated in this record
Fixed versions
4.3.0-11.oe2203sp4

Source reference: /affected/4/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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          }
        ]
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    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:rpm/openEuler/libwebsockets&distro=openEuler-24.03-LTS-SP1",
      "ecosystem": "openEuler:24.03-LTS-SP1"
    },
    "database_specific": {
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        "libwebsockets-debugsource-4.3.3-8.oe2403sp1.x86_64.rpm",
        "libwebsockets-devel-4.3.3-8.oe2403sp1.x86_64.rpm"
      ],
      "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",
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    "ranges": [
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    "package": {
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      "ecosystem": "openEuler:24.03-LTS-SP3"
    },
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        "libwebsockets-devel-4.3.3-8.oe2403sp3.x86_64.rpm"
      ],
      "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"
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
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          {
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          },
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          }
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      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:rpm/openEuler/libwebsockets&distro=openEuler-24.03-LTS-SP4",
      "ecosystem": "openEuler:24.03-LTS-SP4"
    },
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        "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"
      ],
      "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"
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.0-11.oe2003sp4"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:rpm/openEuler/libwebsockets&distro=openEuler-20.03-LTS-SP4",
      "ecosystem": "openEuler:20.03-LTS-SP4"
    },
    "database_specific": {
      "source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4076.json"
    },
    "ecosystem_specific": {
      "src": [
        "libwebsockets-4.3.0-11.oe2003sp4.src.rpm"
      ],
      "noarch": [
        "libwebsockets-help-4.3.0-11.oe2003sp4.noarch.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"
      ],
      "aarch64": [
        "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"
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "4.3.0-11.oe2203sp4"
          }
        ]
      }
    ],
    "package": {
      "name": "libwebsockets",
      "purl": "pkg:rpm/openEuler/libwebsockets&distro=openEuler-22.03-LTS-SP4",
      "ecosystem": "openEuler:22.03-LTS-SP4"
    },
    "database_specific": {
      "source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4076.json"
    },
    "ecosystem_specific": {
      "src": [
        "libwebsockets-4.3.0-11.oe2203sp4.src.rpm"
      ],
      "noarch": [
        "libwebsockets-help-4.3.0-11.oe2203sp4.noarch.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"
      ],
      "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"
      ]
    }
  }
]

Publisher severity

high

Source reference: /database_specific/severity

Event
#14727 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. OESA-2026-4076 · Revision 1Source updated