Buffer overflow in Systerel S2opc
CVE-2026-78049
A vulnerability has been found in Systerel S2OPC up to 1.7.3. Impacted is the function SOPC_NodeMgtHelperInternal_AddVariableNodeAttributes of the file src/ClientServer/address_space/internal/sopc_node_mgt_helper_internal.c of the component AddNodes Service. The manipulation of the argument UserAccessLevel leads to out-of-bounds read. It is possible to initiate the attack remotely. A high degree of complexity is needed for the attack. The exploitability is considered difficult. The exploit has been disclosed to the public and may be used. The identifier of the patch is aafbd37d381b618312ebdf5ddf57027f62c14fdd. It is suggested to install a patch to address this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Systerel S2opc — versions 1.7.0, 1.7.1, 1.7.2
Weakness classification (CWE)
References
- vuldb.com/vuln/394290 (technical-description, vdb-entry)
- vuldb.com/vuln/394290/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-78049 (third-party-advisory)
- vuldb.com/submit/881262 (third-party-advisory)
- gitlab.com/systerel/S2OPC/-/work_items/1787 (related)
- gitlab.com/systerel/S2OPC/-/merge_requests/1826 (patch)
- github.com/user-attachments/files/29702766/PoC.zip (exploit)
- gitlab.com/systerel/S2OPC/-/commit/aafbd37d381b618312ebdf5ddf57027f62c14fdd (patch)
Frequently asked questions
- What is CVE-2026-78049?
- CVE-2026-78049 is a low-severity vulnerability in Systerel S2opc, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.7/10. Published 2026-08-22.
- How severe is CVE-2026-78049?
- Low severity. CVSS v3 base score is 3.7 out of 10.