CVE-2026-55952

In Erlang OTP (inets module), an incorrect authorization vulnerability exists. When script_alias maps a URL prefix to a directory outside DocumentRoot, mod_auth evaluates directory access controls against the DocumentRoot path while mod_cgi executes the script at the ScriptAlias path. This mismatch allows unauthenticated access to CGI scripts protected by directory rules.

In Erlang OTP (inets httpd module), an HTTP Request Smuggling vulnerability exists. The server does not reject or normalize duplicate Content-Length headers. The first value is used, while common proxies use the last, enabling front-end/back-end desynchronization and injection of attacker-controlled bytes as the start of the next request.

An issue was discovered in Erlang/OTP 18.x related to the generation of compiled regular expressions, which is vulnerable to a heap overflow. Regular expressions using a malformed extpattern can indirectly specify an offset used as an array index.

A vulnerability in the Erlang/OTP SSL application allows memory exhaustion by sending a crafted certificate chain during TLS/DTLS handshake. Lack of cycle detection in the certificate chain building function causes unbounded recursion, leading to BEAM node crash.

The TLS 1.2 (and earlier) and DTLS client in Erlang/OTP does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client. An on-path attacker can select an anonymous cipher suite, bypassing certificate and hostname verification, allowing interception and modification of traffic.

In Erlang OTP, a signed to unsigned conversion error and out-of-bounds heap write vulnerability exists when decoding a crafted ETF binary via binary_to_term/1. This can corrupt the BEAM heap pointer and crash the virtual machine.

A vulnerability in the External Term Format (ETF) decoder in ERTS causes an integer underflow when processing crafted binary data. This leads to allocating huge memory and crashing the entire Erlang/VM node.

In the zip module of Erlang OTP stdlib, a relative path traversal vulnerability allows writing files outside the intended extraction directory via a crafted zip archive. The zip:check_dir_level/2 function improperly validates paths containing ../ sequences.

In Erlang OTP (epmd), a connection slot exhaustion vulnerability allows an unauthenticated remote attacker to permanently terminate the epmd daemon. The do_accept function incorrectly treats EMFILE/ENFILE errors as fatal instead of recoverable.

TOCTOU race condition in the ssl module (dtls_packet_demux) in Erlang/OTP. An unauthenticated remote attacker can send multiple ClientHello messages from the same source, causing a race and crash of the demux process, terminating all active DTLS sessions on that listener. The attack is repeatable and requires no authentication.