CVE-2019-3557

Name: CVE-2019-3557
Creator: NVD / NIST
Published: 2019-01-15T22:29:00.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.71%

Last modified Jun 17, 2026

CVE-2019-3557 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

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).

Metrics

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Hhvm	<= 3.27.4
Facebook	Hhvm	>= 3.28.0, <= 3.30.0

References

https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994Patch, Third Party Advisory
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlVendor Advisory
https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994Patch, Third Party Advisory
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.htmlVendor Advisory

Timeline

Published: Jan 15, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-3557?

How severe is CVE-2019-3557?

Severity scoring for CVE-2019-3557 is pending analysis. The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2019-3557?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-3557?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST