CVE-2026-15105

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.

CVSS 4.0

2.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS 3.1

6.3CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-25)

CWEs

CWE-119, CWE-787

Published

2026-07-08

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

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

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