# CVE-2026-54437: QNX io-char library input validation in DCMD_CHR_TCINJECTC

Source: https://junglewise.ai/threats/cve-2026-54437-improper-input-validation-in-the-io-char-library-s-dcmd-chr  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-54437 · Severity: medium · CVSS 6.2 · Published 2026-11-10

The io-char library in QNX, which provides character input/output services for device drivers, contains an improper input validation vulnerability in its DCMD_CHR_TCINJECTC handler. An attacker with local access to the system could exploit this to tamper with data in the memory input buffer of character I/O device drivers, potentially compromising data integrity or device functionality.

Vendors: [QNX](https://junglewise.ai/threats/vendors/qnx).

## Quick answers

**Is CVE-2026-54437 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54437 being exploited in the wild.

**How severe is CVE-2026-54437?** Medium severity, with a CVSS score of 6.2, published 10 November 2026.

**Which products and versions are affected?** QNX io-char library.

**Is there a fix for CVE-2026-54437?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-54437 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-54437?** Check whether you run QNX Io-Char Library. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper input validation flaw in the DCMD_CHR_TCINJECTC devctl() handler within the io-char library. An attacker with local access can trigger data tampering in the memory input buffer of the Character I/O device driver through a crafted devctl() call. This is a local privilege or access issue requiring attacker presence on the affected system.

## Affected products

- QNX io-char library

## Timeline

- 2026-11-10: disclosed

## References

- [https://support.blackberry.com/pkb/s/article/141341](https://support.blackberry.com/pkb/s/article/141341)