The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This…

Description

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).

Scores

EPSS (exploitation in 30 days)

1.7% · top 23% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

• CWE-125: Out-of-bounds Read (CWE-125) (opens in a new tab)All about CWE-125 and its CVEs

Affected products

• Facebook · HHVM

  • affected 3.30.1
  • affected 3.30.0 – < unspecified
  • affected 3.27.5
  • affected unspecified – < 3.27.5

References (2)

• https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html (opens in a new tab)x_refsource_MISCx_transferred
• https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994 (opens in a new tab)x_refsource_MISCx_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-2019-3557](https://trackcve.app/badge/CVE-2019-3557.svg)](https://trackcve.app/cve/CVE-2019-3557)

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