PT-2026-3955 · Orjson · Orjson

Published 2026-01-22 · Updated 2026-05-07 · CVE-2025-67221

Positive Technologies (AI Summary)

CVSS v4.0

7.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

Name of the Vulnerable Software and Affected Versions orjson versions through 3.11.4

Description The orjson.dumps function does not limit recursion when processing deeply nested JSON documents. This can lead to a denial of service.

Recommendations Update to a version of orjson newer than 3.11.4.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2025-67221

ECHO-7F2F-E83A-5508

GHSA-HX9Q-6W63-J58V

OPENSUSE-SU-2026:10103-1

OPENSUSE-SU-2026:20407-1

PYSEC-2026-107

SUSE-SU-2026:20920-1

Affected Products

Orjson

References · 20

• 🔥 https://github.com/kpatsakis/orjson_vulnerability · Exploit
• 🔥 https://github.com/kpatsakis/CVE-2025-67221/issues/1 · Exploit
• https://osv.dev/vulnerability/PYSEC-2026-107 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-PYPI-CVE-2025-67221 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-hx9q-6w63-j58v · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10103-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-67221 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:20920-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20407-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-67221 · Vendor Advisory
• https://github.com/ijl/orjson · Note
• https://github.com/ijl/orjson/commit/62bb185b70785ded49c79c26f8c9781f1e6fe370 · Note
• https://github.com/ijl/orjson/issues/620 · Note
• https://suse.com/support/update/announcement/2026/suse-su-202620920-1 · Note
• https://twitter.com/CVEnew/status/2015448714018447551 · Twitter Post