CVE-2026-63495 Libevent: Unbounded memory accumulation in WebSocket server via fragmented frames

Libevent is an event notification library. From 2.2.0-alpha-dev until 2.2.2-alpha, the libevent WebSocket server in ws.c accumulates fragmented frames in evws-incompleteframes without enforcing a total message-size limit. An unauthenticated remote client can repeatedly send fragmented WebSocket...

CVE-2026-63495 Libevent: Unbounded memory accumulation in WebSocket server via fragmented frames

Libevent is an event notification library. From 2.2.0-alpha-dev until 2.2.2-alpha, the libevent WebSocket server in ws.c accumulates fragmented frames in evws-incompleteframes without enforcing a total message-size limit. An unauthenticated remote client can repeatedly send fragmented WebSocket...

CVE-2026-63383 Libevent: decode_tag_internal() can lead to out-of-bounds read

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in eventtagging.c when decodetaginternal requests at most five bytes from evbufferpullup but iterates using the full logical buffer length. A fragmented evbuffer...

CVE-2026-63383 Libevent: decode_tag_internal() can lead to out-of-bounds read

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in eventtagging.c when decodetaginternal requests at most five bytes from evbufferpullup but iterates using the full logical buffer length. A fragmented evbuffer...

EUVD-2026-63502

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in eventtagging.c when decodetaginternal requests at most five bytes from evbufferpullup but iterates using the full logical buffer length. A fragmented evbuffer...

CVE-2026-63383

In libevent prior to 2.1.13 and 2.2.2-alpha, decode_tag_internal() in event_tagging.c requests at most five bytes via evbuffer_pullup but iterates over the full logical buffer length. A fragmented evbuffer holding a six-byte malformed tag can advance past the pullup window, causing an out-of-boun...

CVE-2026-63383 Libevent: decode_tag_internal() can lead to out-of-bounds read

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in eventtagging.c when decodetaginternal requests at most five bytes from evbufferpullup but iterates using the full logical buffer length. A fragmented evbuffer...

EUVD-2026-63501

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in buffereventsock.c when buffereventsocketsetconnaddress copies a kernel-supplied AFUNIX peer address into buffereventprivate.connaddress. Release builds compiled with NDEBUG disab...

CVE-2026-63388 Libevent: Heap out-of-bounds write in bufferevent_socket_set_conn_address_ reachable via AF_UNIX accept

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in buffereventsock.c when buffereventsocketsetconnaddress copies a kernel-supplied AFUNIX peer address into buffereventprivate.connaddress. Release builds compiled with NDEBUG disab...

CVE-2026-63388

CVE-2026-63388 is a heap out-of-bounds write in libevent (an event notification library) affecting versions prior to 2.1.13 and 2.2.2-alpha . The flaw is in bufferevent_sock.c, where bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into a 28-byte conn_address fie...

CVE-2026-63388

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in buffereventsock.c when buffereventsocketsetconnaddress copies a kernel-supplied AFUNIX peer address into buffereventprivate.connaddress. Release builds compiled with NDEBUG disab...

CVE-2026-63388 Libevent: Heap out-of-bounds write in bufferevent_socket_set_conn_address_ reachable via AF_UNIX accept

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in buffereventsock.c when buffereventsocketsetconnaddress copies a kernel-supplied AFUNIX peer address into buffereventprivate.connaddress. Release builds compiled with NDEBUG disab...

PT-2026-79096

Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws new session enters its error path after evhttp start ws succeeds but bufferevent enable locking fails. evws connection free sees a non-null http server and...

PT-2026-79097

Libevent is an event notification library. From 2.2.0-alpha-dev until 2.2.2-alpha, the libevent WebSocket server in ws.c accumulates fragmented frames in evws-incomplete frames without enforcing a total message-size limit. An unauthenticated remote client can repeatedly send fragmented WebSocket...

OESA-2026-3268 libevent security update

Libevent additionally provides a sophisticated framework for buffered network IO, with support for sockets, filters, rate-limiting, SSL, zero-copy file transmission, and IOCP. Libevent includes support for several useful protocols, including DNS, HTTP, and a minimal RPC framewor. Security Fixes:...

PT-2026-76580

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp find header can select only the fir...

PT-2026-76584

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname to labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns server request format response. The final-label...

PT-2026-76582

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event tagging.c when evtag unmarshal header uses evtag decode int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT MAX...

PT-2026-76585

Name of the Vulnerable Software and Affected Versions Libevent versions prior to 2.1.13 Libevent versions prior to 2.2.2-alpha Description A heap out-of-bounds write occurs in bufferevent sock.c when the function bufferevent socket set conn address copies a kernel-supplied AF UNIX peer address in...

PT-2026-76578

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp read trailer and merges them into request headers. The fix introduces evhttp parse headers impl and a temporary trailer header list. An unauthenticated...