CVE catalog

CVE-2020-1918

UBUNTU-

[CVE catalog]

In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

Severity
Unknown
Published
Updated
Source
[NVD] · [CVE record]
EPSS
1.22% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Ubuntu18.04hhvm3.21.0+dfsg-2Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build1Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build2Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build3Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2ubuntu2Affected[UBUNTU-CVE-2020-1918]
Ubuntu16.04hhvm3.11.0+dfsg-1Affected[UBUNTU-CVE-2020-1918]
Ubuntu16.04hhvm3.11.1+dfsg-1Affected[UBUNTU-CVE-2020-1918]
Ubuntu16.04hhvm3.11.1+dfsg-1ubuntu1Affected[UBUNTU-CVE-2020-1918]
Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Ubuntu16.04hhvm3.11.0+dfsg-1Affected[UBUNTU-CVE-2020-1918]
Ubuntu16.04hhvm3.11.1+dfsg-1Affected[UBUNTU-CVE-2020-1918]
Ubuntu16.04hhvm3.11.1+dfsg-1ubuntu1Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build1Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build2Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2build3Affected[UBUNTU-CVE-2020-1918]
Ubuntu18.04hhvm3.21.0+dfsg-2ubuntu2Affected[UBUNTU-CVE-2020-1918]
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "hhvm",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "3.11.0+dfsg-1",
        "3.11.1+dfsg-1",
        "3.11.1+dfsg-1ubuntu1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-1918",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-1918",
      "provider_updated_at": "2026-04-22T12:32:57.312255Z"
    },
    {
      "name": "hhvm",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "3.21.0+dfsg-2",
        "3.21.0+dfsg-2build1",
        "3.21.0+dfsg-2build2",
        "3.21.0+dfsg-2build3",
        "3.21.0+dfsg-2ubuntu2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-1918",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-1918",
      "provider_updated_at": "2026-04-22T12:32:57.312255Z"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[FIRST EPSS] · [OSV Package Vulnerability Database]