CISA Thorium insecure downloaded file path validation

published 2025-09-17 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-29738

cvss: 5.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits: 0; none known

CISA Thorium does not adequately validate the paths of downloaded files via 'download_ephemeral' and 'download_children'. A remote, authenticated attacker could access arbitrary files subject to file system permissions. Fixed in 1.1.2.

Patch / fix

fixed in 1 links 1

CISA Thorium 1.1.2

github.com/cisagov/thorium/releases/tag/1.1.2 release

Vendor advisories

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

cisa vex VA-25-259-01 updated 2025-09-16 cvss 5.0

CISA Thorium multiple vulnerabilities

CISA Thorium >=1.0.0, <1.1.2
affected: vendor fix
CISA Thorium 1.1.2
fixed: vendor fix github.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 13 mo ago (2025-09-30)

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
CNA	4.0	5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
CNA	4.0	5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

CISA Thorium

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

raw.githubusercontent.com /cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-259-01.json
vendor-advisory
github.com /cisagov/thorium/releases/tag/1.1.2
release-notes
github.com /cisagov/thorium/blob/main/api/src/utils/bounder.rs#L120-L158
product
cve.org /CVERecord?id=CVE-2025-35430
third-party-advisory

Sources

CVE List CVE-2025-35430
NVD CVE-2025-35430

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