Remote Code Execution in fastjson 1.2.68–1.2.83
Priority MEDIUM 42CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00663 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Alibaba | Fastjson | 1.2.68 – 1.2.83 | — | No fix listed | CNA |
| — | com.alibaba:fastjson (Maven) | 1.2.68 – 1.2.83 | — | No fix listed | GHSA-crf3-v9rr-v7hj |
- Fastjson VendorAlibaba Affected 1.2.68 – 1.2.83 Fixed in — No fix listed CNA
- com.alibaba:fastjson (Maven) Vendor— Affected 1.2.68 – 1.2.83 Fixed in — No fix listed GHSA-crf3-v9rr-v7hj
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 2 products
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat build of Debezium 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16723
- 2026-10-03 Alias added: GHSA-crf3-v9rr-v7hj
- 2026-10-06 EPSS moved to the 50th–90th percentile
References
More Alibaba vulnerabilities
- TI-2021-10154 Authentication bypass in Alibaba nacos CVSS 3.1CRITICAL 9.8
- TI-2025-43179 Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON… CVSS 3.1CRITICAL 10.0
- TI-2021-10155 Authentication bypass in Alibaba nacos CVSS 3.1HIGH 8.6
- TI-2017-13524 parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pippo 1.11.0 and… CVSS 3.0CRITICAL 9.8
- TI-2022-09412 Deserialization of untrusted data in com.alibaba:fastjson CVSS 3.1CRITICAL 9.8
- TI-2021-19162 An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter… CVSS 3.1HIGH 8.8
Sources
- CVE-2026-16723 · CVE Program
- CVE-2026-16723 · NVD
- FIRST EPSS
- GHSA-crf3-v9rr-v7hj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-16723 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences