Unauthenticated code execution via Fastjson deserialization
Published Mar 3, 2023 · Updated Mar 6, 2025
Unsafe deserialization in CleverStupidDog yf-exam 1.8.0 allows remote attackers to execute arbitrary code through crafted JSON. The public report identifies bundled Fastjson 1.2.56 as the deserialization layer but does not identify the request handler or parser invocation that accepts attacker-controlled data. No authentication or user interaction is required, and successful exploitation gives code execution in the server process.
Summary
What happened
Unsafe deserialization in CleverStupidDog yf-exam 1.8.0 allows remote attackers to execute arbitrary code through crafted JSON. The public report identifies bundled Fastjson 1.2.56 as the deserialization layer but does not identify the request handler or parser invocation that accepts attacker-controlled data. No authentication or user interaction is required, and successful exploitation gives code execution in the server process.
The record
- CVE
- CVE-2023-26779
- Published
- Mar 3, 2023
- Updated
- Mar 6, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 3, 2023CVE publishedPublication date reported by the CVE source.
- Mar 6, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Fastjson 1.2.56 Deserialization Vulnerabilities issueproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo