CVE-2022-26635
Published: 05 April 2022
Summary
CVE-2022-26635 is a critical-severity an unspecified weakness vulnerability in Php Memcached. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 7.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
PHP-Memcached versions 2.2.0 and earlier are affected by an improper NULL termination condition that permits CRLF injection. The issue is tracked under CVE-2022-26635 with a CVSS 3.1 base score of 9.8, though third-party reports have disputed whether the flaw resides directly in the PHP-Memcached extension itself.
An unauthenticated network attacker can supply crafted input that exploits the missing termination to inject arbitrary CRLF sequences, potentially altering memcached protocol commands and achieving impacts on confidentiality, integrity, and availability without requiring user interaction.
Public references consisting of GitHub issue threads and a technical write-up examine the injection vector but do not describe vendor patches or official mitigation steps.
EPSS for the CVE rose from low values to a peak of 0.2594 on 2025-12-11 before receding to the current 0.0819, indicating a later surge in exploitation interest well after the 2022 disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-31189
Vulnerability details
PHP-Memcached v2.2.0 and below contains an improper NULL termination which allows attackers to execute CLRF injection. Note: Third parties have disputed this as not affecting PHP-Memcached directly.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.