CVE catalog

CVE-2026-48859

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. Wh

[CVE catalog]

Severity: Medium · CVSS 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Jun 10, 2026, 4:17:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.35% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	erlang	sid	`1:29.1.2+dfsg-1`	not affected
Debian	erlang	forky	`1:29.1.1+dfsg-1`	not affected
Debian	erlang	trixie	`1:27.3.4.1+dfsg-1+deb13u3`	not affected
Debian	erlang	trixie-security	`1:27.3.4.1+dfsg-1+deb13u4`	not affected
Debian	erlang	bookworm	`1:25.2.3+dfsg-1+deb12u4`	not affected
Debian	erlang	bookworm-security	`1:25.2.3+dfsg-1+deb12u1`	not affected
Cpe	erlang\/otp	Not reported	`29.0.2`	fixed
Cpe	erlang\/ssh	Not reported	`6.0.1`	fixed
Cpe	erlang\/otp	Not reported	`29.0.2`	fixed
Cpe	erlang\/ssh	Not reported	`6.0.1`	fixed
Ubuntu	erlang	25.10	`1:27.3+dfsg-1ubuntu1`	vulnerable
Ubuntu	erlang	25.10	`1:27.3+dfsg-1ubuntu1.1`	vulnerable
Ubuntu	erlang	25.10	`1:27.3.4.1+dfsg-1`	vulnerable
Ubuntu	erlang	25.10	`1:27.3.4.1+dfsg-1build1`	vulnerable
Ubuntu	erlang	25.10	`1:27.3.4.1+dfsg-1ubuntu0.1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	erlang	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	erlang	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	erlang	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	erlang	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	erlang\/otp	cpe	Not reported	`29.0.2`	Not reported	Not reported	Not reported
Cpe	erlang\/ssh	cpe	Not reported	`6.0.1`	Not reported	Not reported	Not reported
Cpe	erlang\/otp	cpe	Not reported	`29.0.2`	Not reported	NVD-CVE-2026-48859	Not reported
Cpe	erlang\/ssh	cpe	Not reported	`6.0.1`	Not reported	NVD-CVE-2026-48859	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[erlang]Not affected
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-asn1]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-base]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-common-test]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-crypto]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-debugger]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-dev]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-dialyzer]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-diameter]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-doc]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-edoc]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-eldap]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-erl-docgen]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-et]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-eunit]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-examples]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-ftp]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-inets]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · amd64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · arm64 · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-jinterface]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
[erlang-manpages]Not affected
Source package: [erlang]
Details (4)
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u4 · all · bookworm
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm
- 1:25.2.3+dfsg-1+deb12u1 · all · bookworm-security
  Not affected
  nvd · erlang · debian · bookworm

Next results

Observed: Oct 27, 2026, 7:15:08 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]