CVE-2026-62353 TDengine: Authenticated Out-of-Bounds Read in SQL Lexer tGetToken
An authenticated user can crash the TDengine server or leak memory by submitting a SQL query with a trailing backslash in a string literal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-62353?
CVE-2026-62353 is a medium-severity memory corruption vulnerability in taosdata TDengine, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
TDengine is a time-series database optimized for Internet of Things devices. Prior to 3.4.1.14, source/libs/parser/src/parTokenizer.c tGetToken() incremented past a trailing backslash in a SQL string literal such as 'abc\ and read one byte beyond the null terminator, allowing an authenticated user who can submit SQL queries to crash the server and possibly leak adjacent memory. This issue is fixed in version 3.4.1.14.
Which versions are affected by CVE-2026-62353?
How do I fix CVE-2026-62353?
No fix has been published for CVE-2026-62353 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-62353 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62353 exists.