CVE-2026-15105: davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write

Severity: medium (CVSS 6.3 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: 2026-07-08 · updated 2026-10-25
Weakness: CWE-119

Description

A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. 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/16
https://github.com/user-attachments/files/28681740/poc.zip
https://vuldb.com/cve/CVE-2026-15105
https://vuldb.com/submit/851026
https://vuldb.com/vuln/376946
https://vuldb.com/vuln/376946/cti

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