CVE-2025-27607

highpriority · track · 11EPSS 0.016 · 76 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

1.61% (76th) EPSS

CVSS 8.8 · high

Is it mine?

13 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · security-advisories@github.comexploitability 2.8 · impact 5.9

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-829USCWE-829US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Barsug/msgspec-python313-preCVE-2025-27607 fixPoC · poc_in_github

affected products (13)

Products and version ranges known to be affected.

IBM Cognos Analytics <11.2.4 FP6all versionscert_bundDE
IBM Cognos Analytics <12.0.4 FP1all versionscert_bundDE
IBM Cognos Analytics <12.1.0 IF2all versionscert_bundDE
Open Source Python JSON Logger <3.3.0all versionscert_bundDE
IBM Cognos Analytics< 11.2.4 FP6cert_bundDE
IBM Cognos Analytics< 12.0.4 FP1cert_bundDE
IBM Cognos Analytics< 12.1.0 IF2cert_bundDE
Open Source Python≤ JSON Logger <3.3.0cert_bundDE
nhairs python-json-logger3.2.0, → 3.3.0enisa_euvdEU
ООО «Ред Софт» РЕД ОС≤ 8.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
Сообщество свободного программного обеспечения Python JSON Logger3.2.0 → 3.3.0fstec_bduRU
nhairs python json logger< 3.3.0nvdUScpe:2.3:a:nhairs:python_json_logger:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1648IBM Cognos Analytics (Python JSON Logger): Schwachstelle ermöglicht CodeausführungDeutsch2025-07-27csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in IBM Cognos Analytics und Python ausnutzen, um beliebigen Programmcode auszuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2025-03-07modified 2026-07-23

references (12)

External citations — patches, advisories, analysis.

scry

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