CVE-2024-27354: Debian Linux

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560.

Affected products

• Debian Debian Linux: version 10.0 only
• Phpseclib Phpseclib: from 1.0.0, before 1.0.23 (fixed in 1.0.23); from 2.0.0, before 2.0.47 (fixed in 2.0.47); from 3.0.0, before 3.0.36 (fixed in 3.0.36)

Published 2024-03-01. Last modified 2026-06-17.