CVE-2026-67857

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.63% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 50.0% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Deferred. NVD last modified this record on 2026-08-31.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-04 00:00Z2 MO AGO

Last updated

2026-08-05 14:31Z2 MO AGO

Reserved

2026-07-30

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

c8aaee265285d4aa1fd702c1f9f5db1795a28681791e2b4dffc1842f9c1f65f9

• github.comhttps://github.com/open62541/open62541/issues/8104
• github.comhttps://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c
• github.comhttps://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c
• github.comhttps://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c
• github.comhttps://github.com/gff-cw/information/issues/9