What is CVE-2023-52079?

CVE-2023-52079 is a medium-severity vulnerability in Kriszyp Msgpackr, classified under Uncontrolled Recursion. CVSS score: 6.8/10. Published 2023-12-28.

How severe is CVE-2023-52079?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Kriszyp Msgpackr

CVE-2023-52079

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.

Published 2023-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Kriszyp Msgpackr — versions < 1.10.1

Weakness classification (CWE)

References

github.com/kriszyp/msgpackr/security/advisories/GHSA-7hpj-7hhx-2fgx (Vendor Advisory)
github.com/kriszyp/msgpackr/commit/18f44f8800e2261341cdf489d1ba1e35a0133602 (Patch)

Frequently asked questions

What is CVE-2023-52079?: CVE-2023-52079 is a medium-severity vulnerability in Kriszyp Msgpackr, classified under Uncontrolled Recursion. CVSS score: 6.8/10. Published 2023-12-28.
How severe is CVE-2023-52079?: Medium severity. CVSS v3 base score is 6.8 out of 10.