usn-8276-1
Vulnerability from osv_ubuntu
Published
2026-05-19 18:38
Modified
2026-06-25 10:47
Summary
Highlight.js vulnerability
Details

It was discovered that Highlight.js used plain JavaScript objects for internal language name lookups, making them susceptible to prototype pollution attacks. An attacker could use this to cause a denial of service or unexpected application behaviour.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-26237",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-highlight",
            "binary_version": "8.2+ds-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "libjs-highlight.js",
            "binary_version": "8.2+ds-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight",
            "binary_version": "8.2+ds-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight.js",
            "binary_version": "8.2+ds-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "highlight.js",
        "purl": "pkg:deb/ubuntu/highlight.js@8.2+ds-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.2+ds-4ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.2+ds-4build1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-26237",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-highlight",
            "binary_version": "9.12.0+dfsg1-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.12.0+dfsg1-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight",
            "binary_version": "9.12.0+dfsg1-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight.js",
            "binary_version": "9.12.0+dfsg1-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "highlight.js",
        "purl": "pkg:deb/ubuntu/highlight.js@9.12.0+dfsg1-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.12.0+dfsg1-4ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.12.0+dfsg1-3",
        "9.12.0+dfsg1-4"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-26237",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libjs-highlight",
            "binary_version": "9.12.0+dfsg1-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "libjs-highlight.js",
            "binary_version": "9.12.0+dfsg1-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight",
            "binary_version": "9.12.0+dfsg1-5ubuntu0.1~esm1"
          },
          {
            "binary_name": "node-highlight.js",
            "binary_version": "9.12.0+dfsg1-5ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "highlight.js",
        "purl": "pkg:deb/ubuntu/highlight.js@9.12.0+dfsg1-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.12.0+dfsg1-5ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.12.0+dfsg1-4ubuntu1",
        "9.12.0+dfsg1-5"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Highlight.js used plain JavaScript objects for\ninternal language name lookups, making them susceptible to prototype\npollution attacks. An attacker could use this to cause a denial of\nservice or unexpected application behaviour.",
  "id": "USN-8276-1",
  "modified": "2026-06-25T10:47:39Z",
  "published": "2026-05-19T18:38:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8276-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-26237"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Highlight.js vulnerability",
  "upstream": [
    "UBUNTU-CVE-2020-26237"
  ]
}



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