CVE-2026-47783: memcached — Fix

Description

In memcached before 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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0114

Probability of exploitation

0.62%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-208 CWE-208

Affected Products

Vendor	Product	Versions
memcached	memcached	< 1.6.42

References

Advisories & Patches

https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed

Other References

https://github.com/memcached/memcached/compare/1.6.41...1.6.42 https://github.com/memcached/memcached/wiki/ReleaseNotes1642

Frequently Asked Questions

What is CVE-2026-47783? +

In memcached before 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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-47783? +

CVE-2026-47783 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0114, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-47783? +

CVE-2026-47783 affects products from memcached, specifically: memcached. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-47783? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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