CVE-2026-59250
HighCVSS 8.3Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
A classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver's memory (potentially leading to remote code execution or denial of service) by sending a single H.248/Megaco message with an oversized property name. The flaw occurs in mfs_load_property_groups, which uses an unchecked sprintf to write into a fixed 512-byte error_msg field, overwriting adjacent struct fields and enabling arbitrary write and free primitives in the BEAM VM process.
Risk Assessment
The organization is exposed to remote code execution or denial of service by a network attacker without authentication, requiring only reachability to the megaco port on a node configured with {scanner, flex}.
Recommendation
Immediately upgrade Erlang/OTP to version 27.3.4.15, 28.5.0.4, or 29.0.4 (or later) and correspondingly megaco to 4.7.2.2, 4.8.3.1, or 4.9.1. If upgrading is not possible, restrict access to the megaco port to trusted hosts only.
Related vulnerabilities
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Original NVD description (English source)
Classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver's memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name. When tokenizing a Local/Remote descriptor, mfs_load_property_groups extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte error_msg field of the MfsErlDrvData struct using an unchecked sprintf call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (text_buf, text_ptr, term_spec, term_spec_size, term_spec_index), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with _FORTIFY_SOURCE the overflow is detected at runtime and terminates the process with SIGABRT, resulting in denial of service. The overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with {scanner, flex}. This vulnerability is associated with program files lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src and program routines mfs_load_property_groups. This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP 17.0, corresponding to megaco before 3.17.1, is affected is unknown.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS