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Uncontrolled Resource Consumption


Severity High
Score 7.5/10


An issue was discovered in phpseclib/phpseclib versions 1.x prior to 1.0.23, 2.x prior to 2.0.47, and 3.x prior to 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.

  • LOW
  • NONE
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  • HIGH

CWE-400 - Uncontrolled resource consumption

An uncontrolled resource allocation attack (also known as resource exhaustion attack) triggers unauthorized overconsumption of the limited resources in an application, such as memory, file system storage, database connection pool entries, and CPU. This may lead to denial of service for valid users and degradation of the application's functionality as well as that of the host operating system.

Advisory Timeline

  • Published