What is CVE-2026-54436?

CVE-2026-54436 is a high-severity vulnerability in Blackberry Ltd Qnx Software Development Platform, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-11-10.

How severe is CVE-2026-54436?

High severity. CVSS v3 base score is 7.4 out of 10.

Buffer overflow in Blackberry Ltd Qnx Software Development Platform

CVE-2026-54436

Heap-based Buffer Overflow in the io-char library's DCMD_CHR_WAITINFO devctl() handler could allow an attacker with local access to cause data tampering, arbitrary code execution, or a crash in the Character I/O device driver.

Vulnerability class: Buffer Overflow

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Blackberry Ltd Qnx Software Development Platform — versions cpe:2.3:a:blackberry:qnx_software_development_platform:7.0:*:*:*:*:*:*:*, cpe:2.3:a:blackberry:qnx_software_development_platform:7.1:*:*:*:*:*:*:*, cpe:2.3:a:blackberry:qnx_software_development_platform:8.0:*:*:*:*:*:*:*

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

support.blackberry.com/pkb/s/article/141341

Frequently asked questions

What is CVE-2026-54436?: CVE-2026-54436 is a high-severity vulnerability in Blackberry Ltd Qnx Software Development Platform, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-11-10.
How severe is CVE-2026-54436?: High severity. CVSS v3 base score is 7.4 out of 10.