# CVE-2026-84852 — Reader Tools PDF Reader App

> As of 2026-09-02, CVE-2026-84852 is a MEDIUM-severity vulnerability in Reader Tools PDF Reader App, CVSS v3.1 4.4, EPSS 0.1% (6.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-84852 as of 2026-09-02; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-02

## What is CVE-2026-84852?

A security vulnerability has been detected in Reader Tools PDF Reader App 98.8 on Android. The affected element is the function ActSplashNew.handleDeeplink of the component File Handler. The manipulation of the argument _display_name leads to path traversal. An attack has to be approached locally. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

The record classifies CVE-2026-84852 under weakness class [CWE-22](https://intel.threadlinqs.com/cwe/CWE-22). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 33 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.4 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 6.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-02

## Is CVE-2026-84852 being exploited?

Weaponised exploit code for CVE-2026-84852 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-84852.md) (trickest)

## Affected products and versions

- **Reader Tools**: PDF Reader App

## How to fix CVE-2026-84852

No vendor patch reference has been recorded for CVE-2026-84852 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-2026-84852

No threat campaign in the Threadlinqs corpus currently references CVE-2026-84852, 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, GitHub Security Advisories, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-04.

**Exploit and proof of concept**

- [docs.google.com — exploit](https://docs.google.com/document/d/1g8q6UDV2EBm0UfEz2tc1eVBSxXqX5Zk8Ei30FuKAYa8/edit?usp=sharing)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/398130)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/398130/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-84852)
- [vuldb.com — third party advisory (886201)](https://vuldb.com/submit/886201)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-84852
Full detection coverage and IOCs for threats exploiting CVE-2026-84852 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp