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Vulnerability · Published Jul 8, 2026 · Assigned by VulDB

CVE-2026-15105davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead 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 32% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.4%top 68.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:25.10snap7no fix listedUBUNTU-CVE-2026-15105
Ubuntu:26.04:LTSsnap7no fix listedUBUNTU-CVE-2026-15105
Ubuntu:26.10snap7no fix listedUBUNTU-CVE-2026-15105

Affected products (as reported)

VendorProductVersions
davenardella snap7 1.4.01.4.11.4.21.4.3

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

References