How severe is CVE-2023-52079?

CVE-2023-52079 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-52079 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-52079?

CVE-2023-52079 affects Kriszyp Msgpackr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-52079?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-52079 published?

CVE-2023-52079 was published on 2023-12-28 and last updated on 2026-06-17.

CVE-2023-52079

CVE-2023-52079 is a medium-severity vulnerability in Kriszyp Msgpackr with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-674
Affected product: Kriszyp Msgpackr
Published: 2023-12-28
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-52079?: CVE-2023-52079 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-52079 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-52079?: CVE-2023-52079 affects Kriszyp Msgpackr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-52079?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-52079 published?: CVE-2023-52079 was published on 2023-12-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kriszyp:msgpackr:*:*:*:*:*:node.js:*:*

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