vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2020-5234

Untrusted data can lead to DoS attack in MessagePack for C# and Unity

MEDIUM
6.5
CVSS Score
Published: January 31, 2020 at 05:50 PM UTC
Updated: June 17, 2026 at 03:21 AM UTC
2 products affected across 2 vendorsMessagepackMessagePack

Using MessagePack by neuecc?

Get instant alerts when new vulnerabilities affect MessagePack - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

Description

MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps.

Affected

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

Messagepack· Messagepack
95%
v < 1.9.32.0.323 ≤ v < 2.1.802.0.110 alpha2.0.119 beta2.0.123 beta2.0.204 beta2.0.270 rc2.0.299 rc2.0.94 alpha
Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.80, so it looks safe — our inference, not a vendor statement
MessagePack· Neuecc
60%
v < 1.9.11v < 2.1.90
Affected range stops below 1.9.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.90, 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 (4)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/neuecc/MessagePack-CSharp/commit/56fa86219d01d0a183babbbbcb34abbdea588a02
x_refsource_MISC
Source: [email protected]
https://github.com/neuecc/MessagePack-CSharp/commit/f88684078698386df02204f13faeff098a61f007
x_refsource_MISC
Source: [email protected]
https://github.com/neuecc/MessagePack-CSharp/issues/810
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/neuecc/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card