CVE-2023-52079Network attack vector

Thread hang via recursive property-name conversion

Published Dec 28, 2023 · Updated Aug 27, 2024

Uncontrolled recursion in MsgPackr before 1.10.1 allows remote attackers to hang decoding threads with crafted MessagePack input. In unpack.js, readKey and recordDefinition called toString() on decoded non-string property values, allowing structured-clone references to recurse during key conversion. The condition requires structured cloning and a crafted 0x70 extension, and the resulting loop interrupts the thread without reported data disclosure or modification.

CVSS severity6.8
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Uncontrolled recursion in MsgPackr before 1.10.1 allows remote attackers to hang decoding threads with crafted MessagePack input. In unpack.js, readKey and recordDefinition called toString() on decoded non-string property values, allowing structured-clone references to recurse during key conversion. The condition requires structured cloning and a crafted 0x70 extension, and the resulting loop interrupts the thread without reported data disclosure or modification.

The record

CVE
CVE-2023-52079
Published
Dec 28, 2023
Updated
Aug 27, 2024
Vendor
Kris Zyp
Product
MsgPackr
Classifications
CWE-674, CWE-754, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kris Zyp · MsgPackrversion=< 1.10.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo