pdfkit: Path traversal in from_string

published 2026-06-17 4 mo ago modified 2026-10-12 27 d ago also GHSA-9g3x-6x24-vf9f , PYSEC-2026-2860 , EUVD-2025-210273

cvss: 8.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

In JazzCore python-pdfkit 1.0.0, the from_string method enables the execution of JavaScript code within the context of the server application and the exfiltration of local files.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-26240 updated 2026-08-06 cvss 8.4

python-pdfkit: python-pdfkit: Arbitrary Code Execution and Information Disclosure

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 4 mo ago (2026-06-17)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

habuon.github.io https://habuon.github.io/2025/03/12/pdfkit-vulnerability-%28CVE-2025-26240%29.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.4	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	8.4	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	8.4	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	8.4	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	pdfkit	<=1.0.0	no fix listed

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input
CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

habuon.github.io /2025/03/12/pdfkit-vulnerability-%28CVE-2025-26240%29.html
exploit, web
csirt.gov.sk /the-python-pdfkit-library-vulnerability.html
web
nvd.nist.gov /vuln/detail/CVE-2025-26240
advisory
github.com /JazzCore/python-pdfkit
package
pypi.org /project/pdfkit
package
github.com /advisories/GHSA-9g3x-6x24-vf9f
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary