CVE-2026-90698
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
In memcached 1.6.41/1.6.42/1.6.43, the try_read_command_asciiauth function in proto_text.c (mcmc Tokenizer component) allows an out-of-bounds read. The attack can be launched remotely and the exploit has been publicly released. The fix is available in version 1.6.44 (commit af05c9302bba508b736c3da1d5670f63fe8b7db4).
Risk Assessment
A remote attacker can trigger an out-of-bounds read, potentially leading to memory disclosure or a memcached service crash, disrupting applications relying on the cache.
Recommendation
Upgrade memcached to version 1.6.44 or later, which contains fix af05c9302bba508b736c3da1d5670f63fe8b7db4.
Other vulnerabilities in memcached
See all- CVE-2017-9951High
The try_read_command function in memcached before version 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read.
- CVE-2016-8706High
An integer overflow in the process_bin_sasl_auth function in Memcached can be exploited to cause heap overflow and lead to remote code execution.
- CVE-2016-8705Critical
Multiple integer overflows in the process_bin_update function in Memcached can be exploited to cause heap overflow and lead to remote code execution.
- CVE-2016-8704Critical
An integer overflow in the process_bin_append_prepend function in Memcached can be exploited to cause heap overflow and lead to remote code execution.
- CVE-2026-47784High
Memcached before version 1.6.42 uses the memcmp function for password comparison in SASL authentication, causing a timing side-channel vulnerability. An attacker can read passwords by measuring response times.
- CVE-2026-47783High
In memcached before version 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.
Original NVD description (English source)
A security flaw has been discovered in memcached 1.6.41/1.6.42/1.6.43. This vulnerability affects the function try_read_command_asciiauth of the file proto_text.c of the component mcmc Tokenizer. The manipulation results in out-of-bounds read. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 1.6.44 is able to resolve this issue. The patch is identified as af05c9302bba508b736c3da1d5670f63fe8b7db4. You should upgrade the affected component.