Buffer overflow in Davenardella Snap7
CVE-2026-90572
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (35.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Davenardella Snap7 — versions 1.4.0, 1.4.1, 1.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/403157 (technical-description, vdb-entry, mitigation)
- vuldb.com/vuln/403157/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90572 (third-party-advisory)
- vuldb.com/submit/912711 (third-party-advisory)
- github.com/davenardella/snap7/issues/30 (issue-tracking, exploit)
- github.com/davenardella/snap7/ (product)
Frequently asked questions
- What is CVE-2026-90572?
- CVE-2026-90572 is a medium-severity vulnerability in Davenardella Snap7, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.7/10. Published 2026-09-13.
- How severe is CVE-2026-90572?
- Medium severity. CVSS v3 base score is 4.7 out of 10.