What’s Vulnerable › Vulnerabilities

CVE-2025-35435: CISA Thorium download stream divide by zero

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-17 · updated 2026-06-17
• Weakness: CWE-369

Description

CISA Thorium accepts a stream split size of zero then divides by this value. A remote, authenticated attacker could cause the service to crash. Fixed in commit 89101a6.

Affected products

• CISA Thorium: through 1.1.2

References

• https://github.com/cisagov/thorium/commit/7c94a0b9bc2dc55e0c307360452f348bac06820c
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-259-01.json
• https://www.cve.org/CVERecord?id=CVE-2025-CVE-2025-35435

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