CVE-2026-29975 Denial of service in n/a
A remote attacker can cause applications using the lwjson streaming parser to hang indefinitely by sending specific JSON strings, resulting in denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-29975?
CVE-2026-29975 is a high-severity denial of service vulnerability in n/a, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-835
Which versions are affected by CVE-2026-29975?
How do I fix CVE-2026-29975?
No fix has been published for CVE-2026-29975 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-29975 being exploited?
There is no known exploitation of CVE-2026-29975 in the wild and no public exploit code.
Sources
Also known as GHSA-hr45-w7f7-w9j6.