What is CVE-2022-26635?

CVE-2022-26635 is a critical-severity vulnerability in PHP Memcached. CVSS score: 9.8/10. Published 2022-04-05.

How severe is CVE-2022-26635?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2022-26635 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in PHP Memcached

CVE-2022-26635

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.

Published 2022-04-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.214 (97.5th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.214 · newest: 0.214 · change: 0.000

Affected products

PHP Memcached

Public proof-of-concept exploits

References

xhzeem.me/posts/Php5-memcached-Injection-Bypass/read/ (Exploit, Third Party Advisory)
github.com/php-memcached-dev/php-memcached/issues/519

Frequently asked questions

What is CVE-2022-26635?: CVE-2022-26635 is a critical-severity vulnerability in PHP Memcached. CVSS score: 9.8/10. Published 2022-04-05.
How severe is CVE-2022-26635?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2022-26635 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.