CVE-2025-26618

Name	CVE-2025-26618
Description	Erlang is a programming language and runtime system for building massively scalable soft real-time systems with requirements on high availability. OTP is a set of Erlang libraries, which consists of the Erlang runtime system, a number of ready-to-use components mainly written in Erlang. Packet size is not verified properly for SFTP packets. As a result when multiple SSH packets (conforming to max SSH packet size) are received by ssh, they might be combined into an SFTP packet which will exceed the max allowed packet size and potentially cause large amount of memory to be allocated. Note that situation described above can only happen for successfully authenticated users after completing the SSH handshake. This issue has been patched in OTP versions 27.2.4, 26.2.5.9, and 25.3.2.18. There are no known workarounds for this vulnerability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
erlang (PTS)	bullseye	1:23.2.6+dfsg-1+deb11u1	vulnerable
	bookworm	1:25.2.3+dfsg-1	vulnerable
	trixie	1:25.3.2.12+dfsg-3	vulnerable
	sid	1:27.2.4+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
erlang	source	(unstable)	1:27.2.4+dfsg-1

Notes

[bullseye] - erlang <postponed> (Minor issue)
https://github.com/erlang/otp/security/advisories/GHSA-78cv-45vx-q6fr
https://github.com/erlang/otp/commit/0ed2573cbd55c92e9125c9dc70fa1ca7fed82872 (OTP-25.3.2.18, OTP-26.2.5.9, OTP-27.2.4)