@openzeppelin/contracts

Direct Vulnerabilities

Known vulnerabilities in the @openzeppelin/contracts package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability	Vulnerable Version
M Out-of-bounds Read	>=5.2.0 <5.4.0
M Out-of-bounds Read	>=4.5.0 <4.9.6>=5.0.0-rc.0 <5.0.2
M Always-Incorrect Control Flow Implementation	>=4.9.4 <4.9.5
M Improper Encoding or Escaping of Output	>=4.0.0 <4.9.3
M Improper Input Validation	>=4.7.0 <4.9.2
L Missing Authorization	>=4.3.0 <4.9.1
L Denial of Service (DoS)	>=3.2.0 <4.8.3
M Improper Input Validation	>=4.3.0 <4.8.3
M Incorrect Calculation	>=4.8.0 <4.8.2
M Incorrect Calculation	>=4.8.0 <4.8.2
H Improper Verification of Cryptographic Signature	<4.7.3
M Denial of Service (DoS)	>=2.3.0 <4.7.2
L Incorrect Resource Transfer Between Spheres	>=4.6.0 <4.7.2
H Incorrect Calculation	>=4.3.0 <4.7.2
H Information Exposure	>=4.1.0 <4.7.1
H Information Exposure	>=4.0.0 <4.7.1
M Function Call With Incorrect Argument	>=4.3.0 <4.4.2
H Deserialization of Untrusted Data	>=3.2.0 <4.4.1
H Deserialization of Untrusted Data	>=3.2.0 <4.4.1
M Numeric Errors	>=4.2.0 <4.3.3
C Improper Initialization	>=4.1.0 <4.3.2
H Improper Input Validation	>=4.1.0 <4.3.2
C Privilege Escalation	>=4.0.0-beta.0 <4.3.1<3.4.2
M Improper Synchronization	<3.4.0-rc.0

Vulnerability

Vulnerable Version

Out-of-bounds Read

>=5.2.0 <5.4.0

Out-of-bounds Read

>=4.5.0 <4.9.6>=5.0.0-rc.0 <5.0.2

Always-Incorrect Control Flow Implementation

>=4.9.4 <4.9.5

Improper Encoding or Escaping of Output

>=4.0.0 <4.9.3

Improper Input Validation

>=4.7.0 <4.9.2

Missing Authorization

>=4.3.0 <4.9.1

Denial of Service (DoS)

>=3.2.0 <4.8.3

Improper Input Validation

>=4.3.0 <4.8.3

Incorrect Calculation

>=4.8.0 <4.8.2

Incorrect Calculation

>=4.8.0 <4.8.2

Improper Verification of Cryptographic Signature

<4.7.3

Denial of Service (DoS)

>=2.3.0 <4.7.2

Incorrect Resource Transfer Between Spheres

>=4.6.0 <4.7.2

Incorrect Calculation

>=4.3.0 <4.7.2

Information Exposure

>=4.1.0 <4.7.1

Information Exposure

>=4.0.0 <4.7.1

Function Call With Incorrect Argument

>=4.3.0 <4.4.2

Deserialization of Untrusted Data

>=3.2.0 <4.4.1

Deserialization of Untrusted Data

>=3.2.0 <4.4.1

Numeric Errors

>=4.2.0 <4.3.3

Improper Initialization

>=4.1.0 <4.3.2

Improper Input Validation

>=4.1.0 <4.3.2

Privilege Escalation

>=4.0.0-beta.0 <4.3.1<3.4.2

Improper Synchronization

<3.4.0-rc.0

Package versions

102 VERSIONS IN TOTAL See all versions

version	published	direct vulnerabilities
5.6.1	27 Feb, 2026	0 C 0 H 0 M 0 L
5.6.0	25 Feb, 2026	0 C 0 H 0 M 0 L
5.6.0-rc.1	12 Jan, 2026	0 C 0 H 0 M 0 L
5.6.0-rc.0	19 Dec, 2025	0 C 0 H 0 M 0 L
5.5.0	31 Oct, 2025	0 C 0 H 0 M 0 L
5.5.0-rc.1	10 Oct, 2025	0 C 0 H 0 M 0 L
5.5.0-rc.0	26 Sep, 2025	0 C 0 H 0 M 0 L
5.4.0	17 Jul, 2025	0 C 0 H 0 M 0 L
5.4.0-rc.1	20 Jun, 2025	0 C 0 H 1 M 0 L
5.4.0-rc.0	18 Jun, 2025	0 C 0 H 1 M 0 L