Vulnerability · Published Jan 22, 2026 · Assigned by mitre
CVE-2025-67221
High 7.5
In plain English
A high-severity resource allocation without limits in the orjson package (PyPI). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 49.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official description
The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | orjson | 3.11.6 | GHSA-hx9q-6w63-j58v |
| PyPI | orjson | 3.11.5 | PYSEC-2026-107 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H