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Vulnerabilities

Vulnerability · CVE-2026-33438

Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files.

Published Mar 26, 2026 · catalog updated Jun 17, 2026 · stirling pdf

Check if you run it

No confirmed exploitation is on record for CVE-2026-33438. EPSS is 0.44%. Act only if a listed version of stirling pdf is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Advisory link
Affected products
cpe stirling/stirling pdf

Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. Versions starting in 2.1.5 and prior to 2.5.2 have Denial of Service (DoS) vulnerability in the Stirling-PDF watermark functionality ( endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the and parameters. Version 2.5.2 patches the issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe stirling/stirling pdfversion unspecified

How to fix CVE-2026-33438

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33438. EPSS is 0.44%. Act only if a listed version of stirling pdf is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 26, 2026 · NIST NVD

    Detected

    Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. Versions starting in 2.1.5 and prior to 2.5.2 have Denial of Service (DoS) vulnerability in the Stirling-PDF watermark functionality ( endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the and parameters.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. Versions starting in 2.1.5 and prior to 2.5.2 have Denial of Service (DoS) vulnerability in the Stirling-PDF watermark functionality ( endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the and parameters.

Sources

  • CVE.orgVulnerability recordCVE-2026-33438

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33438

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33438

    Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. Versions starting in 2.1.5 and prior to 2.5.2 have Denial of Service (DoS) vulnerability in the Stirling-PDF watermark functionality ( endp

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.