Back to Database
Status published
Critical
CVE-2018-6345
The function number_format is vulnerable to a heap overflow issue...
Vulnerability Description
The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2018-6345
Credits & Attribution
No credits recorded in the NVD database.
References
More from Facebook
View All →CVE-2025-64296
WordPress Facebook for WooCommerce plugin <= 3.5.7 - Broken Access Control to Notice Dismissal vulnerability
Medium
5.3
CVE-2025-55181
Sending an HTTP request/response body with greater than 2^31 bytes...
Medium
5.3
CVE-2025-55179
Incomplete validation of rich response messages in WhatsApp for iOS...
Medium
5.4
CVE-2025-55177
Incomplete authorization of linked device synchronization messages in WhatsApp for...
Medium
5.4
CVE-2025-30403
A heap-buffer-overflow vulnerability is possible in mvfst via a specially...
Unknown
0
Affected Vendor
Affected Software
HHVM
Vulnerable Versions:
3.30.2, 3.30.0, 3.27.6, unspecified
Timeline
Official Publish:
January 15th, 2019
Last Modified:
August 5th, 2024
Added to House:
July 20th, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H