open62541 1.5.5 contains an out-of-bounds read in the client-side function…
Priority HIGH 66CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.
Summary
open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0063 50th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-67857
- 2026-10-03 Alias added: GHSA-2mh5-cmr8-pwvp
- 2026-10-28 EPSS moved to the 50th–90th percentile
References
Other 5
- https://github.com/open62541/open62541/issues/8104
- https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c
- https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c
- https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c
- https://github.com/gff-cw/information/issues/9
Sources
- CVE-2026-67857 · CVE Program
- CVE-2026-67857 · NVD
- FIRST EPSS
- GHSA-2mh5-cmr8-pwvp · GitHub Advisory Database · CC BY 4.0
- CVE-2026-67857 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences