ReleaseNotes1643

Date: 2026-7-2

http://www.memcached.org/files/memcached-1.6.43.tar.gz

More likely critical security fixes and less critical bugfixes.

Similar to the last release, we received a few security reports, usually with huge masses of text detailing some kind of compromise. In these cases the fixes were small and obvious, making the repairs trivial. You should strongly consider upgrading if you run memcached outside of a secure network, but otherwise the odds of compromise seem low. I do not have the time to classify the bugs myself, but hope to resume in the future if report levels stay slower.

NON SECURITY IMPORTANT NOTE: Users of lru_crawler metadump and mgdump commands will now receive an OK\r\n line before the metadata stream begins. This was always in the protocol spec but missing due to a bug. I decided to add it back in since it's confusing to users and easier to write a valid parser with both OK and END to signify stream boundaries. You may need to make minor updates to tooling to compensate.

• binprot: avoid item refcount overflows [security]
• mcmc: upstream bump for security issue [security]
• tests: cap polling backoff in slabs-mover wait helpers
• seccomp: allow ppoll in worker sandbox
• core: avoid slab reassignment while holding locks
• lru_crawler: add missing OK\r\n prefix to dumps
• Avoid unaligned accesses on NEED_ALIGN builds
• core: enforce ascii auth more when enabled [security]

None.

The following people contributed to this release since 1.6.42.

Note that this is based on who contributed changes, not how they were done. In many cases, a code snippet on the mailing list or a bug report ended up as a commit with your name on it.

Note that this is just a summary of how many changes each person made which doesn't necessarily reflect how significant each change was. For details on what led up into a branch, either grab the git repo and look at the output of git log 1.6.42..1.6.43 or use a web view.

• Repo list: https://github.com/memcached/memcached/wiki/DevelopmentRepos
• Web View: http://github.com/memcached/memcached/commits/1.6.43

     4	dormando
     2	Zhou Qiankang
     1	NikitaNavrotskiy
     1	Petr Sumbera
     1	hanqing2025