CVE-2026-90572 Details
Description
A vulnerability was determined in davenardella snap7 up to 1.4.3. The affected element is the function TSnap7MicroClient::opUpload of the file src/core/s7_micro_client.cpp. Executing a manipulation of the argument DataLen can lead to memory corruption. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
A memory corruption vulnerability has been identified in Snap7 versions prior to 1.4.3. The issue arises in the TSnap7MicroClient::opUpload function within the file src/core/s7_micro_client.cpp. The vulnerability allows for remote exploitation by manipulating the DataLen header field, leading to a negative-size memcpy or an out-of-bounds read. This memory safety issue can cause applications to crash or behave unexpectedly.
No official fix has been released yet, but the vulnerability can be addressed by validating the DataLen header field before performing the memcpy operation. This includes checking the sign of the length, ensuring it does not exceed the capacity of the receive buffer, and verifying it against the actual number of bytes received.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 13, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/davenardella/snap7/ | [email protected] | Source CodeVendor |
| https://github.com/davenardella/snap7/issues/30 | [email protected] | ExploitIssue TrackingTechnical AnalysisVendor |
| https://vuldb.com/cve/CVE-2026-90572 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/912711 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/403157 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/403157/cti | [email protected] | AdvisoryContent Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| davenardella snap7 | <= 1.4.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 13, 2026 | New CVE Received | [email protected] |