CVE-2026-90572: davenardella snap7 s7_micro_client.cpp opUpload memory corruption

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-13 · updated 2026-09-15
Weakness: CWE-119

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.

Affected products

davenardella snap7: 1.4.0, 1.4.1, 1.4.2, 1.4.3

References

https://github.com/davenardella/snap7/
https://github.com/davenardella/snap7/issues/30
https://vuldb.com/cve/CVE-2026-90572
https://vuldb.com/submit/912711
https://vuldb.com/vuln/403157
https://vuldb.com/vuln/403157/cti

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