CVE-2019-3556
mediumpriority · track · 33EPSS 0.018 · 78 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.5–8.1
weaknesses
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affected products (14)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
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references (10)
External citations — patches, advisories, analysis.
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4cnnvd
- https://hhvm.com/blog/2020/11/12/security-update.htmlcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2019-3556cnnvd
- https://www.facebook.com/security/advisories/cve-2019-3556cnnvd
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4enisa_euvd
- https://hhvm.com/blog/2020/11/12/security-update.htmlenisa_euvd
- https://www.facebook.com/security/advisories/cve-2019-3556enisa_euvd
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4PatchThird Party Advisorynvd
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