CVE-2026-67862: open62541 1.5.5 contains a buffer-overflow in the high-level attribute reading logic in src/client/ua_client_highlevel.c. This allows a remote attacker to cause a denial of service
open62541 1.5.5 contains a buffer-overflow in the high-level attribute reading logic in src/client/ua_client_highlevel.c. This allows a remote attacker to cause a denial of service.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-67862
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-678620.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-67862 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for open62541
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalCVE-2026-67870: In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete valid…nvd · 2026-08-06
- highCVE-2026-67869: Buffer Overflow vulnerability in open62541 v1.5.5 allows a remote attacker to cause a denial o…nvd · 2026-08-06
- highCVE-2026-67863: In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback pa…nvd · 2026-08-05
- highCVE-2026-67864: An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service…nvd · 2026-08-05
- highCVE-2026-67861: An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service…nvd · 2026-08-04
- highCVE-2026-67860: open62541 1.5.5 contains a heap-based buffer overflow in the default HistoryRead path when the…nvd · 2026-08-04
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