CVE-2025-26618: SSH SFTP packet size not verified properly in Erlang OTP
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.
Classification
CVE ID: CVE-2025-26618
CVSS Base Severity: HIGH
CVSS Base Score: 7.0
CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Affected Products
Vendor: erlang
Product: otp
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 12.32% (scored less or equal to compared to others)
EPSS Date: 2025-03-21 (when was this score calculated)
References
https://github.com/erlang/otp/security/advisories/GHSA-78cv-45vx-q6frhttps://github.com/erlang/otp/commit/0ed2573cbd55c92e9125c9dc70fa1ca7fed82872