CVE-2026-29975: n/a
lwjson 1.8.1 contains an improper input validation vulnerability in the streaming JSON parser (lwjson_stream.c). The end-of-string detection logic incorrectly identifies escaped quote characters by only checking the immediately preceding character rather than counting consecutive backslashes, causing valid JSON strings ending with an escaped backslash (like "\\") to never terminate parsing. A remote attacker can send well-formed JSON to cause applications using lwjson_stream_parse() to hang indefinitely, resulting in denial of service.
AI Analysis
Technical Summary
The vulnerability in lwjson 1.8.1 arises from improper input validation in the streaming JSON parser (lwjson_stream.c). Specifically, the parser's end-of-string detection logic only checks the immediately preceding character to identify escaped quotes, failing to count consecutive backslashes correctly. This results in valid JSON strings ending with an escaped backslash (e.g., "\\") causing the parser to hang indefinitely. This behavior can be triggered remotely by sending specially crafted JSON input to applications using lwjson_stream_parse(), resulting in a denial of service.
Potential Impact
Exploitation of this vulnerability allows a remote attacker to cause applications using the affected lwjson streaming parser to hang indefinitely, leading to a denial of service. There is no indication of code execution or data leakage from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider mitigating exposure by validating or sanitizing JSON input before parsing or using alternative JSON parsing libraries not affected by this issue.
CVE-2026-29975: n/a
Description
lwjson 1.8.1 contains an improper input validation vulnerability in the streaming JSON parser (lwjson_stream.c). The end-of-string detection logic incorrectly identifies escaped quote characters by only checking the immediately preceding character rather than counting consecutive backslashes, causing valid JSON strings ending with an escaped backslash (like "\\") to never terminate parsing. A remote attacker can send well-formed JSON to cause applications using lwjson_stream_parse() to hang indefinitely, resulting in denial of service.
CVSS v3.1
Score 7.5high
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in lwjson 1.8.1 arises from improper input validation in the streaming JSON parser (lwjson_stream.c). Specifically, the parser's end-of-string detection logic only checks the immediately preceding character to identify escaped quotes, failing to count consecutive backslashes correctly. This results in valid JSON strings ending with an escaped backslash (e.g., "\\") causing the parser to hang indefinitely. This behavior can be triggered remotely by sending specially crafted JSON input to applications using lwjson_stream_parse(), resulting in a denial of service.
Potential Impact
Exploitation of this vulnerability allows a remote attacker to cause applications using the affected lwjson streaming parser to hang indefinitely, leading to a denial of service. There is no indication of code execution or data leakage from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider mitigating exposure by validating or sanitizing JSON input before parsing or using alternative JSON parsing libraries not affected by this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-03-04T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fe067ecbff5d8610f67282
Added to database: 05/08/2026, 15:51:26 UTC
Last enriched: 05/08/2026, 16:07:57 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 112
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.