CVE-2026-34071: Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files

Routine

MEDIUM 5.4DOWNGRADE

CVE-2026-34071 is a medium-severity flaw (CVSS 5.4) affecting stirling pdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. In version 2.7.3, the /api/v1/convert/eml/pdf endpoint with parameter downloadHtml=true returns unsanitized HTML from the email body with Content-Type: text/html. An attacker who sends a malicious email to a Stirling-PDF user can achieve JavaScript execution when that user exports the email using the "Download HTML intermediate file" featu

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: stirling

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 17:16 UTCPublished CVE record published
2026-06-17 10:38 UTCUpdated Record last modified

stirling stirling pdf DOWNGRADE

Affected: 2.7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.3

1. Check installed version

apt-cache policy stirling-pdf || rpm -q stirling-pdf || stirling-pdf --version

2. No fixed release: DOWNGRADE to a release before 2.7.3 (Debian / Ubuntu)

apt-cache madison stirling-pdf sudo apt install stirling-pdf=<VERSION_BEFORE_2.7.3> sudo apt-mark hold stirling-pdf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list stirling-pdf sudo dnf downgrade stirling-pdf-<VERSION_BEFORE_2.7.3> sudo dnf versionlock add stirling-pdf

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34071?

stirling pdf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34071 being exploited?

CVE-2026-34071 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34071 affect?

CVE-2026-34071 affects stirling pdf. Severity is medium (CVSS 5.4). Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files. In version 2.7.3, the /api/v1/convert/eml/pdf endpoint with parameter downloadHtml=true returns unsanitized HTML from the email bod

How urgent is CVE-2026-34071?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2026-33436 LOW 3.1 UPGRADE Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files
CVE-2026-41580 MEDIUM 6.1 UPGRADE Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files
CVE-2026-33438 MEDIUM 6.5 UPGRADE Stirling-PDF is a locally hosted web application that allows you to perform various operations on PDF files
CVE-2026-27625 HIGH 8.1 UPGRADE Stirling-PDF is a locally hosted web application that performs various operations on PDF files

References

← Back to latest CVEs