Main Vulnerability Database Vulnerabilities #VU77053

Infinite loop in phpseclib - CVE-2023-27560

Published: June 7, 2023 / Updated: May 21, 2026

Vulnerability identifier: #VU77053

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-27560

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop with composite primefields within Math/PrimeField.php. A remote attacker can consume all available system resources and cause denial of service conditions.

Affected software

phpseclib
API Portal

How to mitigate CVE-2023-27560

Install updates from vendor's website.

phpseclib - update to 3.0.19
API Portal - update to May 2023

External References

https://github.com/phpseclib/phpseclib/commit/6298d1cd55c3ffa44533bd41906caec246b60440
https://github.com/phpseclib/phpseclib/releases/tag/3.0.19
https://github.com/phpseclib/phpseclib/security/advisories/GHSA-3gq8-39j3-92xg

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