CVE-2022-26635Public exploitNetwork attack vector

Memcached command injection via NUL-terminated crafted keys

Published Apr 5, 2022 · Updated Aug 3, 2024

CRLF injection in PHP-Memcached 2.2.0 and earlier allows remote attackers to read or overwrite cached values through crafted keys. The published proof of concept feeds Memcached::get an application-supplied key containing a NUL byte followed by CRLF-delimited commands, which the ASCII protocol interprets as additional cache operations. Upstream disputes that the extension is defective because applications must validate untrusted cache keys; reachability requires a web application to pass remote input directly into a cache-key operation.

CVSS severity9.8
Critical
EPSS probability21.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in PHP-Memcached 2.2.0 and earlier allows remote attackers to read or overwrite cached values through crafted keys. The published proof of concept feeds Memcached::get an application-supplied key containing a NUL byte followed by CRLF-delimited commands, which the ASCII protocol interprets as additional cache operations. Upstream disputes that the extension is defective because applications must validate untrusted cache keys; reachability requires a web application to pass remote input directly into a cache-key operation.

The record

CVE
CVE-2022-26635
Published
Apr 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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