CVE-2025-70974

fastjson: From CVEorg collector

Published Jan 9, 2026 CVSS 3.1 · 10 Critical EPSS < 1% KEV · Not listed
Description
Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key is the name of a Java class, there may be calls to certain public methods of that class. Depending on the behavior of those methods, there may be JNDI injection with an attacker-supplied payload located elsewhere in that JSON document. This was exploited in the wild in 2023 through 2025. NOTE: this issue exists because of an incomplete fix for CVE-2017-18349. Also, a later bypass is covered by CVE-2022-25845.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-jm7w-5684-pvh8 FASTJSON Includes Functionality from Untrusted Control Sphere
History
Type Values Removed Values Added
Title fastjson: From CVEorg collector
References
Metrics threat_severity

None

threat_severity

Critical

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Alibaba
Alibaba fastjson
Vendors & Products Alibaba
Alibaba fastjson
Type Values Removed Values Added
Description Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key is the name of a Java class, there may be calls to certain public methods of that class. Depending on the behavior of those methods, there may be JNDI injection with an attacker-supplied payload located elsewhere in that JSON document. This was exploited in the wild in 2023 through 2025. NOTE: this issue exists because of an incomplete fix for CVE-2017-18349. Also, a later bypass is covered by CVE-2022-25845.
Weaknesses CWE-829
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 15, 2026, 11:47 AM
Reserved
Jan 9, 2026, 6:43 AM
Status
Deferred
Published
Jan 9, 2026, 7:16 AM
Modified
Jul 15, 2026, 2:17 AM
Severity
Critical
Public date
Jan 9, 2026, 6:43 AM