Math/PrimeField.php in phpseclib 3.x before 3.0.19 has an infinite loop with composite primefields.
Priority MEDIUM 40CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-835.
Summary
Math/PrimeField.php in phpseclib 3.x before 3.0.19 has an infinite loop with composite primefields.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00808 57th percentileScored 2026-11-07
Fix Fixed phpseclib/phpseclib (Packagist): 3.0.19
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | phpseclib/phpseclib (Packagist) | 3.0.0 to before 3.0.19 | 3.0.19 | Patch available | GHSA-hm7p-r324-hhf3 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- phpseclib/phpseclib (Packagist) Vendor— Affected 3.0.0 to before 3.0.19 Fixed in 3.0.19 Patch available GHSA-hm7p-r324-hhf3
Remediation
- Fix · GHSA-hm7p-r324-hhf3 phpseclib/phpseclib (Packagist) Fixed in 3.0.19 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-27560
- 2026-10-03 Alias added: GHSA-hm7p-r324-hhf3
References
Other 4
- https://github.com/phpseclib/phpseclib/releases/tag/3.0.19
- https://github.com/phpseclib/phpseclib/commit/6298d1cd55c3ffa44533bd41906caec246b60440#commitcomment-103226722
- https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2023-27560.yaml
- https://github.com/phpseclib/phpseclib
More Phpseclib vulnerabilities
- TI-2026-40135 Server-side request forgery in phpseclib CVSS 3.1MEDIUM 5.8
- TI-2026-29008 phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals() CVSS 3.1LOW 3.7
- TI-2023-29213 In phpseclib before 1.0.22, 2.x before 2.0.46, and 3.x before 3.0.33, some characters in… CVSS 3.1HIGH 7.5
- TI-2024-18192 An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before… CVSS 3.1HIGH 7.5
- TI-2024-18191 An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before… CVSS 3.1HIGH 7.5
- TI-2026-25383 phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack CVSS 4.0HIGH 8.2
Sources
- CVE-2023-27560 · CVE Program
- CVE-2023-27560 · NVD
- FIRST EPSS
- GHSA-hm7p-r324-hhf3 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-27560 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences