# CVE-2026-78049: Systerel S2OPC AddNodes Service sopc_node_mgt_helper_internal.c out-of-bounds

> Remote attackers can trigger an out-of-bounds read in S2OPC's AddNodes service, potentially causing information disclosure or crashes.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-cq93-frxj-593v

## What is CVE-2026-78049?

CVE-2026-78049 is a medium-severity memory corruption vulnerability in Systerel S2OPC, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-125 (Out-of-bounds Read), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-78049?


## How do I fix CVE-2026-78049?

No fix has been published for CVE-2026-78049 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-78049 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78049 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78049 and fix it if it is affected.

What it is: CVE-2026-78049 is a medium-severity memory corruption vulnerability in Systerel S2OPC, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78049 exists.

Affected product: Systerel S2OPC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-78049/ (Markdown: https://insights.sbomify.com/CVE-2026-78049/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78049
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78049
- OSV: https://osv.dev/vulnerability/CVE-2026-78049

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78049/
Summaries are generated and may contain mistakes; the official description above is the record.