Red Hat Security Advisory: memcached security update
memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Security Fix(es): * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
Memcached before version 1.6.42 contains a timing side channel vulnerability in the SASL authentication mechanism. Specifically, the username data used for SASL password database authentication can be enumerated because the authentication loop exits early upon finding a valid username, allowing an attacker to infer valid usernames based on response timing differences. Red Hat has released patches for affected versions of memcached distributed with Red Hat Enterprise Linux 9 and 10 to mitigate this issue.
Potential Impact
An attacker can enumerate valid usernames via timing analysis during SASL authentication attempts, potentially aiding further targeted attacks. This does not directly allow password compromise or remote code execution but can disclose sensitive authentication information.
Mitigation Recommendations
Official patches are available from Red Hat for affected memcached versions distributed with Red Hat Enterprise Linux 9 and 10. Users should apply these updates as detailed in Red Hat advisories RHSA-2026:27842 and RHSA-2026:27862. Refer to https://access.redhat.com/articles/11258 for update instructions. No additional mitigation is required beyond applying the official fixes.
Red Hat Security Advisory: memcached security update
Description
memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Security Fix(es): * memcached: memcached: Username enumeration via timing side channel (CVE-2026-47783) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Memcached before version 1.6.42 contains a timing side channel vulnerability in the SASL authentication mechanism. Specifically, the username data used for SASL password database authentication can be enumerated because the authentication loop exits early upon finding a valid username, allowing an attacker to infer valid usernames based on response timing differences. Red Hat has released patches for affected versions of memcached distributed with Red Hat Enterprise Linux 9 and 10 to mitigate this issue.
Potential Impact
An attacker can enumerate valid usernames via timing analysis during SASL authentication attempts, potentially aiding further targeted attacks. This does not directly allow password compromise or remote code execution but can disclose sensitive authentication information.
Mitigation Recommendations
Official patches are available from Red Hat for affected memcached versions distributed with Red Hat Enterprise Linux 9 and 10. Users should apply these updates as detailed in Red Hat advisories RHSA-2026:27842 and RHSA-2026:27862. Refer to https://access.redhat.com/articles/11258 for update instructions. No additional mitigation is required beyond applying the official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_base
- Csaf Version
- 2.0
- Publisher
- Bundesamt für Sicherheit in der Informationstechnik
- Advisory Id
- WID-SEC-W-2026-1615
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-47784"]
Threat ID: 6a18ab9fe29bf47b50289d44
Added to database: 05/28/2026, 20:54:55 UTC
Last enriched: 07/07/2026, 00:48:20 UTC
Last updated: 09/14/2026, 10:01:31 UTC
Views: 104
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