CVE-2025-70974 | Fastjson before 1.2.48 mishandles autoType because, when an … | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2025-70974
State: PUBLISHED
Assigner: mitre
Reserved: 2026-01-09 06:43 UTC
Published: 2026-01-09 06:43 UTC
Last updated: 2026-07-15 11:47 UTC
Primary CWE: CWE-829
CWE-829 Inclusion of Functionality from Untrusted Control Sp…
Vendor / Product: Alibaba / Fastjson
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Alibaba	Fastjson	—	0 < 1.2.48

Weakness (CWE)

CWE	Source	Description
CWE-829	cna	CWE-829 Inclusion of Functionality from Untrusted Control Sphere
CWE-829	adp	Inclusion of Functionality from Untrusted Control Sphere

CVSS scores (2)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References (7)