Erlang/OTP -- megaco flex scanner buffer overflow

2026-07-27 · CVE-2026-59250 · VuXML entry

https://github.com/erlang/otp/security/advisories/GHSA-7xgh-gmgf-q2g7 reports: A remote unauthenticated attacker can crash Erlang nodes running the megaco text codec with the flex scanner option by sending an H.248/Megaco message with a property parm name exceeding 452 bytes. The overflow occurs in a C linked-in driver, causing the entire BEAM VM process to terminate. It is reachable pre-authentication, as the flex …

Affected versions

• erlang < 28.5.0.4,4
• erlang-runtime27 < 27.3.4.15
• erlang-runtime28 < 28.5.0.4
• erlang-runtime29 < 29.0.4

By system

3 still vulnerable, 4 fixed. Where VuXML applies (FreeBSD, DragonFly, FreeBSD's derivatives) a port is vulnerable while its version is in a range; pkgsrc says itself whether it lists a CVE of this advisory; OpenBSD and MidnightBSD keep no list this site reads, so their row is only an estimate: FreeBSD's ranges applied to upstream's version.