CVE-2019-3557
highpriority · track · 40EPSS 0.017 · 77 %ileEUUSEPSS · scored 2026-10-27
The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This behavior caused some stream functions, such as stream_get_line, to trigger an out-of-bounds read when operating on such malformed streams. The implementations were updated to return valid values consistently. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
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 (6)
External citations — patches, advisories, analysis.
- https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994cnnvd
- https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlcnnvd
- https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994enisa_euvd
- https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlenisa_euvd
- https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994PatchThird Party Advisorynvd
- https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlVendor Advisorynvd
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