CVE-2026-62349 taosdata CVE debrief

Who should care

Defenders responsible for TDengine systems, operators of TDengine platforms, vulnerability management teams, and security teams should assess exposure and prioritize patching to prevent potential denial of service and remote code execution. They should verify TDengine version and configuration, review compensating controls for exposed systems, and monitor TDengine systems for potential attacks. Security teams should track exceptions and retest remediated

Why it matters

TDengine vulnerability CVE-2026-62349 can cause denial of service and potentially remote code execution. Defenders should prioritize patching TDengine to version 3.4.1.14 or later.

• Denial of service due to out-of-bounds write to stack buffer
• Potential remote code execution
• Verification of TDengine version and configuration required
• Patching to version 3.4.1.14 or later necessary

Technical summary

The `trimString()` function in `parUtil.c` of TDengine versions 3.4.1.6 and earlier does not properly check space for one byte before processing SQL string escape sequences, leading to a potential one-byte out-of-bounds write to the stack buffer `tmpTokenBuf`. This issue can cause denial of service and potentially remote code execution. The vulnerability is fixed in version 3.4.1.14. Affected product deployments should be identified and patched to prevent potential denial of service and remote code execution. Defenders should review and update TDengine configurations to ensure secure usage and monitor systems for potential attacks.

Defensive priority

Defenders should prioritize patching TDengine to version 3.4.1.14 or later to prevent potential denial of service and remote code execution.

Recommended defensive actions

• Patch TDengine to version 3.4.1.14 or later
• Review and update TDengine configurations to ensure secure usage
• Monitor TDengine systems for potential denial of service and remote code execution attempts
• Verify TDengine version and configuration
• Review compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The vulnerability is caused by the `trimString()` function in `parUtil.c` not properly checking space for one byte before processing SQL string escape sequences. This issue can lead to a one-byte out-of-bounds write to the stack buffer `tmpTokenBuf`.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.