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CVE-2025-26618— SSH SFTP packet size not verified properly in Erlang OTP

Quick assessment

Affected
erlang otp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 存在安全漏洞，该漏洞源于未正确验证SFTP数据包大小，会导致大量内存被分配。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.49% · P41
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I. Basic Information for CVE-2025-26618

Vulnerability Information
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Vulnerability Title
SSH SFTP packet size not verified properly in Erlang OTP
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 存在安全漏洞，该漏洞源于未正确验证SFTP数据包大小，会导致大量内存被分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
erlang otp >= OTP-27.0.0, < OTP-27.2.4 -

II. Public POCs for CVE-2025-26618

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III. Intelligence Information for CVE-2025-26618

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Patches & Fixes for CVE-2025-26618 (1)

Vendor Advisories for CVE-2025-26618 (1)

IV. Related Vulnerabilities

Same product: otp
Same vendor: erlang
Same weakness: CWE-789

V. Comments for CVE-2025-26618

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