Vulnerability · Published Sep 13, 2026 · Assigned by VulDB

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

Medium 4.7

In plain English

A medium-severity memory corruption in snap7 from davenardella. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)4.7Medium

Exploit odds (30 days)0.4%top 63.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
davenardella	snap7	1.4.01.4.11.4.21.4.3

Weakness: CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-403157 | davenardella snap7 s7_micro_client.cpp opUpload memory corruption vdb-entry, technical-description, mitigation
VDB-403157 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-90572 | CVE Analysis and Report third-party-advisory
Submit #912711 | davenardella snap7 1.4.3 Memory Corruption third-party-advisory
https://github.com/davenardella/snap7/issues/30 exploit, issue-tracking
https://github.com/davenardella/snap7/ product