# CVE-2026-101205 — FastStone Image Viewer

> As of 2026-09-29, CVE-2026-101205 is a MEDIUM-severity vulnerability in FastStone Image Viewer, CVSS v3.1 6.3, EPSS 0.2% (12.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-101205 as of 2026-09-29; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-29

## What is CVE-2026-101205?

A vulnerability was determined in FastStone Image Viewer up to 8.3. This impacts an unknown function of the component PCX Decoder. This manipulation causes out-of-bounds read. The attack may be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

The record classifies CVE-2026-101205 under weakness classes [CWE-125](https://intel.threadlinqs.com/cwe/CWE-125), [CWE-119](https://intel.threadlinqs.com/cwe/CWE-119). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 7 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 12.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-28, last modified 2026-09-29

## Is CVE-2026-101205 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **FastStone**: Image Viewer

## How to fix CVE-2026-101205

No vendor patch reference has been recorded for CVE-2026-101205 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-2026-101205

No threat campaign in the Threadlinqs corpus currently references CVE-2026-101205, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-29.

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/411014/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-101205)
- [vuldb.com — third party advisory (907618)](https://vuldb.com/submit/907618)

**Vulnerability database entry**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/411014)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-101205
Full detection coverage and IOCs for threats exploiting CVE-2026-101205 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp