How severe is CVE-2026-33438?

CVE-2026-33438 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-33438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33438?

CVE-2026-33438 affects Stirling Stirling Pdf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33438?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33438 have an EU (EUVD) identifier?

Yes. CVE-2026-33438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16262.

When was CVE-2026-33438 published?

CVE-2026-33438 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-33438

CVE-2026-33438 is a medium-severity vulnerability in Stirling Stirling Pdf with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16262
Weakness: CWE-770
Affected product: Stirling Stirling Pdf
Published: 2026-03-26
Last modified: 2026-06-17

Description

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 (`/api/v1/security/add-watermark` endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the `fontSize` and `widthSpacer` parameters. Version 2.5.2 patches the issue.

Frequently asked questions

What is CVE-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 (`/api/v1/security/add-watermark` endpoint). The vulnerability allows authenticated users to cause resource exhaustion and server crashes by providing extreme values for the `fontSize` and `widthSpacer` parameters. Version 2.5.2 patches the issue.
How severe is CVE-2026-33438?: CVE-2026-33438 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-33438 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33438?: CVE-2026-33438 affects Stirling Stirling Pdf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33438?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33438 have an EU (EUVD) identifier?: Yes. CVE-2026-33438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16262.
When was CVE-2026-33438 published?: CVE-2026-33438 was published on 2026-03-26 and last updated on 2026-06-17.

References

https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-3932-2rfq-87xm

Affected products (1)

cpe:2.3:a:stirling:stirling_pdf:*:*:*:*:*:*:*:*

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