CVE-2026-16225: davenardella snap7 s7_peer.cpp NegotiatePDULength 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: 2026-07-19 · updated 2026-10-24
Weakness: CWE-119

Description

A security flaw has been discovered in davenardella snap7 up to 1.4.3. The impacted element is the function TSnap7Peer::NegotiatePDULength of the file src/core/s7_peer.cpp. The manipulation of the argument PDULength results in out-of-bounds write. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

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/17
https://vuldb.com/cve/CVE-2026-16225
https://vuldb.com/submit/858228
https://vuldb.com/vuln/380047
https://vuldb.com/vuln/380047/cti

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