Vulnerability · Published Jul 19, 2026 · Assigned by VulDB

CVE-2026-16225davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write

Medium 6.3

In plain English

A medium-severity out-of-bounds write 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 34% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.4%top 65.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
davenardella	snap7	1.4.01.4.11.4.21.4.3

Weakness: CWE-787, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-380047 | davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write vdb-entry, technical-description
VDB-380047 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-16225 | CVE Analysis and Report third-party-advisory
Submit #858228 | Davide Nardella Snap7 1.4.3 Heap-Based Intra-Object Out-of-Bounds Write third-party-advisory
https://github.com/davenardella/snap7/issues/17 exploit, issue-tracking
https://github.com/davenardella/snap7/ product