What is 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.
The record classifies CVE-2026-15105 under weakness classes CWE-787, CWE-119. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 99 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.3 — MEDIUM
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 - CVSS v4.0 base score
- 5.3
CVSS: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 - EPSS (FIRST)
- 0.3% probability of exploitation in the next 30 days, higher than 29.6% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-07-08, last modified 2026-08-01
Is CVE-2026-15105 being exploited?
Weaponised exploit code for CVE-2026-15105 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 27 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- davenardella: snap7
How to fix CVE-2026-15105
No vendor patch reference has been recorded for CVE-2026-15105 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-15105
1 tracked threat in the Threadlinqs corpus references CVE-2026-15105, either in the campaign’s CVE list or as an indicator on the campaign record.
- AI-Powered Attacks Targeting Siemens S7 Series PLCs in U.S. Critical Infrastructure — CRITICAL · 2026-08-19
Sources
Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on .