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Changes in version 2.1.13-stable (01 July 2026)

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.
Source: README.md, updated 2026-07-01