Provides a scalable multi-threaded event notification mechanism to
execute a callback when a specific event occurs on a file descriptor,
due to signals, or after a timeout has been reached, whether explicit or
from other sources.
For more information see the project home page:
https://libevent.org
or GitHub repository:
https://github.com/libevent/libevent
The following packages have been upgraded in the Cygwin distribution:
- libevent-devel 2.1.13
- libevent2.1_7 2.1.13
- mingw64-x86_64-libevent 2.1.13
- mingw64-i686-libevent 2.1.13
For changes since the previous Cygwin release see below or for complete
details after installation read /usr/share/doc/libevent/ChangeLog:
https://github.com/libevent/libevent/blob/release-2.1.13-stable/ChangeLog
2026-07-01 2.1.13
This release contains several security fixes, affecting users of the
following modules: evbuffer, bufferevent, evtag, evrpc, evdns, evhttp.
If you have a program that uses one of those modules,
or if you distribute libevent, you should upgrade.
Additionally, this release backports some small modernizations to
the libevent codebase, to aid in compiling with the compilers
released over the last few years.
Security Fixes (evtag, evrpc):
- Fix an out-of-bounds read in decode_tag_internal.
(Found by @Brubbish. GHSA-fj29-64w6-73h6)
- Fix an integer overflow in evtag_unmarshal_header.
(Found by @Brubbish. GHSA-45c6-qx49-89m8)
Security Fixes (evhttp):
- Discard HTTP trailers, to prevent header smuggling attacks.
(Found by @sebastianosrt. GHSA-2gmv-p5m7-98p6)
- Restrict HTTP header parsing to prevent request smuggling.
(Originally reported by @xclow3n; and then by @kodareef5,
@nstaller0490, @AsafMeizneer, and @yaotushaozhu.
GHSA-q39v-w2g7-gr8j.)
- Treat CRLF and %00 more strictly in HTTP headers, to prevent
parser mismatch attacks.
(Reported by @xclow3n and @AsafMeizner. See GHSA-q39v-w2g7-gr8j,
GHSA-jcwh-pvf2-73p2.)
- Fix a heap out-of-bound write that could occur when using
AF_UNIX sockets and compiling libevent with -DNDEBUG.
(Found by @mat-mo. GHSA-cvq5-vrvr-j338)
Security fixes (evbuffer, bufferevent):
- Fixed a dangling pointer in evbuffer_add_reference.
(Found by @DarkaMaul. GHSA-c2pj-cg4r-88c8)
Security fixes (evdns):
- Fix an out-of-bounds write in dnsname_to_labels
when building a DNS response of 2^16 bytes.
(Found by @sectroyer. GHSA-58rx-7448-jw47)
Security fixes (example code):
- Avoid using strcpy() in sample/http-server.c.
(Reported by @sectroyer. GHSA-5rgj-2c58-7jrc.)
Other fixes:
- Backport fixes for numerous compiler warnings.
- Backport fixes for compilation with openssl 3 and later.
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