TI-2019-02622 Aliases CVE-2019-3557 GHSA-x6p7-p3gg-q926

Out-of-bounds read in Meta HHVM

MEDIUM 45CWE-125Published 2019-01-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

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).

Why it matters now

EPSS 0.01711 77th percentileScored 2026-11-07

Fix Fixed HHVM (Facebook): 3.27.5

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Meta	HHVM	3.30.1; 3.30.0 and later; 3.27.5; before 3.27.5	3.27.5	Patch available	CNA

HHVM VendorMeta Affected 3.30.1; 3.30.0 and later; 3.27.5; before 3.27.5 Fixed in 3.27.5 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:facebook:hhvm::::::::	up to 3.27.4; 3.28.0 – 3.30.0	Vulnerable	Meta

cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:* Versions up to 3.27.4; 3.28.0 – 3.30.0 Vulnerable ·Meta

Remediation

Fix · CNA HHVM (Facebook) Fixed in 3.27.5

Timeline

2026-10-02 Threatist record created from CVE-2019-3557
2026-10-03 Alias added: GHSA-x6p7-p3gg-q926

References

Patch 1

https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994

Advisory 1

https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html

TI-2018-04659 Improper input validation in Meta HHVM CVSS 3.1CRITICAL 9.8
TI-2022-17147 Broken or risky cryptographic algorithm in Meta HHVM CVSS 3.1CRITICAL 9.8
TI-2019-08934 Memory corruption in Meta HHVM CVSS 3.1CRITICAL 9.8
TI-2021-06352 Heap-based buffer overflow in Meta folly CVSS 3.1CRITICAL 9.8
TI-2019-08935 An invalid free in mb_detect_order can cause the application to crash or potentially… CVSS 3.1CRITICAL 9.8
TI-2016-05898 Integer overflow in bcmath in Facebook HHVM before 3.15.0 allows attackers to have… CVSS 3.0CRITICAL 9.8

See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences