HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers,…

Description

HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.

Scores

EPSS (exploitation in 30 days)

1.8% · top 22% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Weakness

• CWE-22: Improper Limitation of a Pathname to a Restricted Directory (CWE-22) (opens in a new tab)All about CWE-22 and its CVEs

Affected products

• Facebook · HHVM

  • unaffected 4.83.1 – < unspecified
  • affected 4.83.0 – < unspecified
  • unaffected 4.82.1 – < unspecified
  • affected 4.82.0 – < unspecified
  • unaffected 4.81.1 – < unspecified
  • affected 4.81.0 – < unspecified
  • unaffected 4.80.1 – < unspecified
  • affected 4.80.0 – < unspecified
  • unaffected 4.79.1 – < unspecified
  • affected 4.79.0 – < unspecified
  • unaffected 4.78.1 – < unspecified
  • affected 4.57.0 – < unspecified
  • unaffected 4.56.2 – < unspecified
  • affected unspecified – < 4.56.2

References (3)

• https://hhvm.com/blog/2020/11/12/security-update.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.facebook.com/security/advisories/cve-2019-3556 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-3556](https://trackcve.app/badge/CVE-2019-3556.svg)](https://trackcve.app/cve/CVE-2019-3556)

Record last updated 4 Aug 2024, 19:12 UTC.