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Back to active CVEs
Medium · CVSS 5.3CVE-2026-48859

SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated username enumerationCVE-2026-48859

Answer in brief

CVE-2026-48859 records a Medium severity (CVSS 5.3) vulnerability in SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated username enumeration. The current sources do not mark it as known exploited. The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 10, 2026Updated Sep 8, 2026Source checked Oct 23, 2026First seen by HOL Aug 3, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:erlang:erlang\/ssh:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Erlang/erlang/otpgeneric>=032d1bc9491a3975c68faf9bc7776115d6ae3005 <c342092ef4b369bb409d5b71ac8fd83bab74aedfc342092ef4b369bb409d5b71ac8fd83bab74aedf
Erlang/OTPgeneric>=032d1bc9491a3975c68faf9bc7776115d6ae3005 <c342092ef4b369bb409d5b71ac8fd83bab74aedfc342092ef4b369bb409d5b71ac8fd83bab74aedf
Erlang/OTPgeneric>=29.0 <29.0.229.0.2
Erlang/OTPgeneric>=6.0 <6.0.16.0.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Erlang/erlang/otp, Erlang/OTP, Erlang/OTP.
  2. 2Review the reported fix. Source-reported workaround: * Use the pwdfun option instead of user_passwords for password authentication. The pwdfun callback gives full control over timing behavior and is not affected by this vulnerability. Implementations should take care to execute in approximately constant time regardless of username validity. * Restrict SSH port access to trusted networks only via firewall rules, reducing the set of potential attackers who can perform timing measurements.

Evidence timeline and material changes

  1. Published upstream

    Jun 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 3, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
  • Source referenceerlang.org
Upstream source description

Observable Timing Discrepancy vulnerability in Erlang/OTP ssh (ssh_auth, ssh_options modules) allows unauthenticated remote username enumeration via timing side-channel in password authentication. When the SSH daemon is configured with the user_passwords or password option, ssh_auth:check_password/3 performs a PBKDF2-SHA256 computation with 600,000 iterations (~300ms) for valid usernames, but returns immediately (~0ms) for invalid usernames via the ssh_options:get_password_option/2 path. This timing difference is detectable in a single authentication attempt and allows an unauthenticated attacker to distinguish valid from invalid usernames. The user_passwords and password options are documented as intended for test purposes; the recommended alternative is pwdfun, which is not affected by this vulnerability. This vulnerability is associated with program files lib/ssh/src/ssh_auth.erl and lib/ssh/src/ssh_options.erl. This issue affects OTP from OTP 29.0 before OTP 29.0.2, corresponding to ssh from 6.0 before 6.0.1.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-208
Source
CVE List V5
Source checked
Oct 23, 2026
References
5 linked sources
Open source record