CVE-2026-110021
Missing GSDX SignatureValue verification
Description
PLCnext Engineer checks GSDX manifest reference digests but does not cryptographically verify the XML `SignatureValue` over canonicalized `SignedInfo`. An unauthenticated local attacker can modify signed GSDML content, update its manifest digest, retain the public certificate data, and leave an invalid nonempty `SignatureValue`. PLCnext Engineer prior to 2026.6 reports the package as `Valid` and selects the modified device description for import under the default policy.
INFO
Published Date :
Nov. 4, 2026, 9:19 a.m.
Last Modified :
Nov. 4, 2026, 9:19 a.m.
Remotely Exploit :
No
Source :
CERTVDE
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 270ccfa6-a436-4e77-922e-914ec3a9685c | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 270ccfa6-a436-4e77-922e-914ec3a9685c | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Verify XML signature values are correctly signed.
- Update PLCnext Engineer to a secure version.
- Implement stricter manifest validation checks.
- Reject unsigned or invalid GSDML packages.
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