CVE-2023-52079: msgpackr is a fast MessagePack NodeJS/JavaScript implementation

This month

MEDIUM 6.8REMOTEUPGRADE

CVE-2023-52079 is a medium-severity flaw (CVSS 6.8) affecting msgpackr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

msgpackr is a fast MessagePack NodeJS/JavaScript implementation. Prior to 1.10.1, when decoding user supplied MessagePack messages, users can trigger stuck threads by crafting messages that keep the decoder stuck in a loop. The fix is available in v1.10.1. Exploits seem to require structured cloning, replacing the 0x70 extension with your own (that throws an error or does something other than recursive referencing) should mitigate the issue.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-674, CWE-754
Published	2023-12-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: kriszyp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-28 16:16 UTCPublished CVE record published
2026-06-17 06:42 UTCUpdated Record last modified

kriszyp msgpackr UPGRADE

Affected: < 1.10.1

Fixed in: 1.10.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls msgpackr

2. UPGRADE to 1.10.1

npm install msgpackr@">=1.10.1"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-52079?

msgpackr: upgrade to 1.10.1. Exact commands for each OS are on this page.

Is CVE-2023-52079 being exploited?

CVE-2023-52079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-52079 affect?

CVE-2023-52079 affects msgpackr. Severity is medium (CVSS 6.8). msgpackr is a fast MessagePack NodeJS/JavaScript implementation. Prior to 1.10.1, when decoding user supplied MessagePack messages, users can trigger stuck threads by crafting messages that keep the decoder stuck in a loop. The fix is avail

How urgent is CVE-2023-52079?

Priority 42/100. Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

References

← Back to latest CVEs