CVE-2025-48040

Malicious Key Exchange Messages may Lead to Excessive Resource Consumption

publishedCWE-400CWE-770

Uncontrolled Resource Consumption vulnerability in Erlang OTP ssh (ssh_sftp modules) allows Excessive Allocation, Flooding. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl. This issue affects OTP from OTP 17.0 before OTP 26.2.5.15, OTP 27.3.4.3, and OTP 28.0.3, corresponding to ssh from 3.0.1 before 5.1.4.12, 5.2.11.3, and 5.3.3.

Technical severity6.9 mediumCVSS 4.0 · CNA: EEF

Published2025-09-11Source updated 2026-11-11

Collected2026-11-112 attributed sources

Fixes and workarounds

Workaround

* set option parallel_login to false * reduce max_sessions option

Source: CNA: EEF

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: EEF

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: EEF

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: EEF

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
OTP Erlang `otp` software-id	≥ 17.0; < * (affected, otp); unaffected at 26.2.5.15; unaffected at 27.3.4.3; unaffected at 28.0.3 Other versions: unaffected	CNA: EEF
OTP Erlang `ssh` otp	≥ 3.0.1; < * (affected, otp); unaffected at 5.1.4.12; unaffected at 5.2.11.3; unaffected at 5.3.3 Other versions: unaffected	CNA: EEF
OTP Erlang `erlang/otp` github	≥ 07b8f441ca711f9812fad9e9115bab3c3aa92f79; < * (affected, git); unaffected at 548f1295d86d0803da884db8685cc16d461d0d5a; unaffected at 7cd7abb7e19e16b027eaee6a54e1f6fbbe21181a Other versions: unaffected	CNA: EEF

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 6.9 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`	CNA: EEF

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/erlang/otp/security/advisories/GHSA-h7rg-6rjg-4cphCNA: EEF · vendor-advisory, related
https://cna.erlef.org/cves/CVE-2025-48040.htmlCNA: EEF · related
https://osv.dev/vulnerability/EEF-CVE-2025-48040CNA: EEF · related
https://www.erlang.org/doc/system/versions.html#order-of-versionsCNA: EEF · x_version-scheme
https://github.com/erlang/otp/pull/10162CNA: EEF · patch
https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79CNA: EEF · related
https://github.com/erlang/otp/commit/548f1295d86d0803da884db8685cc16d461d0d5aCNA: EEF · patch
https://github.com/erlang/otp/commit/7cd7abb7e19e16b027eaee6a54e1f6fbbe21181aCNA: EEF · patch

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