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CVE-2025-27607

Nhairs Python Json Logger vulnerability

8.8 HIGHPublic exploitEPSS 1.61%
  1. Published7 Mar 2025

Description

Python JSON Logger is a JSON Formatter for Python Logging. Between 30 December 2024 and 4 March 2025 Python JSON Logger was vulnerable to RCE through a missing dependency. This occurred because msgspec-python313-pre was deleted by the owner leaving the name open to being claimed by a third party. If the package was claimed, it would allow them RCE on any Python JSON Logger user who installed the development dependencies on Python 3.13 (e.g. pip install python-json-logger[dev]). This issue has been resolved with 3.3.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Nhairs Python Json Logger< 3.3.0

Remediation

Fixed in
Nhairs Python Json Logger≥ 3.3.0

References

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Frequently asked

Is CVE-2025-27607 being actively exploited?

CVE-2025-27607 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.61%.

How severe is CVE-2025-27607?

CVE-2025-27607 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.61% probability of exploitation.

Which products are affected by CVE-2025-27607?

Affected products include Nhairs Python Json Logger.

How do I fix CVE-2025-27607?

Upgrade affected software to a fixed version, for example Nhairs Python Json Logger 3.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-27607 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.