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CVE-2018-6345

CRITICAL
9.8
CVSS Score
Published: January 15, 2019 at 10:00 PM UTC
Updated: June 17, 2026 at 02:01 AM UTC
1 product affected across 1 vendorHHVM

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HHVM· Facebook
95%
v ≥ 3.30.0v ≤ 3.27.5v < 3.27.63.28.0 ≤ v ≤ 3.30.13.27.63.30.03.30.2
Affected range stops below 3.27.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-787

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