Code execution via out-of-bounds string scan
Published Feb 3, 2023 · Updated Mar 26, 2025
Heap buffer overflow in MojoJson 1.2.3 allows remote attackers to execute arbitrary code by submitting crafted JSON for parsing. The SkipString path in Json.c reads one byte beyond the allocated input buffer while ParseString scans the supplied value. Exploitation requires a consuming application to pass attacker-controlled JSON to the C parser; the public reproducer demonstrates the out-of-bounds access but not code execution.
Summary
What happened
Heap buffer overflow in MojoJson 1.2.3 allows remote attackers to execute arbitrary code by submitting crafted JSON for parsing. The SkipString path in Json.c reads one byte beyond the allocated input buffer while ParseString scans the supplied value. Exploitation requires a consuming application to pass attacker-controlled JSON to the C parser; the public reproducer demonstrates the out-of-bounds access but not code execution.
The record
- CVE
- CVE-2023-23086
- Published
- Feb 3, 2023
- Updated
- Mar 26, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 3, 2023CVE publishedPublication date reported by the CVE source.
- Mar 26, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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
- Crafted JSON heap-overflow reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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