CVE-2026-48859

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 29.0.2 corresponding to ssh from 6.0 before 6.0.1.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
27.5%
KEV
Not listed

Published

June 10, 2026

Last Modified

June 15, 2026

Advisory Details (5)

Auto-updated Jun 13, 2026
Patch available. Sources: github_commit, github.
generic

Versions — Erlang System Documentation v29.0.2

https://www.erlang.org/doc/system/versions.html#order-of-versions
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-48859
github Patch Available

SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated username enumeration · Advisory · erlang/otp · GitHub

https://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4
github_commit

commit c342092ef4b3 (erlang/otp)

Fix landed in erlang/otp commit c342092ef4b3 — awaiting tagged release

https://github.com/erlang/otp/commit/c342092ef4b369bb409d5b71ac8fd83bab74aedf
generic

SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated username enumeration | Erlang Ecosystem Foundation CNA

https://cna.erlef.org/cves/CVE-2026-48859.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 67× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 00:14 UTCEG score recompute
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-10 23:41 UTCEG score recompute
  4. 2026-07-09 22:59 UTCEG score recompute
  5. 2026-07-09 19:10 UTCEPSS rescore
  6. 2026-07-08 22:28 UTCEG score recompute
  7. 2026-07-08 15:16 UTCEPSS rescore
  8. 2026-07-07 21:57 UTCEG score recompute
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 02:23 UTCEPSS rescore
  12. 2026-07-05 19:52 UTCEG score recompute
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 19:21 UTCEG score recompute
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-03 16:00 UTCEG score recompute
  17. 2026-07-02 15:30 UTCEG score recompute
  18. 2026-07-01 15:07 UTCEPSS rescore
  19. 2026-07-01 14:57 UTCEG score recompute
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 14:27 UTCEG score recompute
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 13:51 UTCEG score recompute
  25. 2026-06-28 14:07 UTCEPSS rescore
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  1. 2026-06-28 13:20 UTCEG score recompute
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 12:47 UTCEG score recompute
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-26 12:16 UTCEG score recompute
  7. 2026-06-25 13:49 UTCEPSS rescore
  8. 2026-06-25 07:27 UTCEG score recompute
  9. 2026-06-24 14:05 UTCEPSS rescore
  10. 2026-06-24 06:54 UTCEG score recompute
  11. 2026-06-23 21:33 UTCEPSS rescore
  12. 2026-06-23 21:33 UTCEPSS rescore
  13. 2026-06-23 04:38 UTCEG score recompute
  14. 2026-06-22 14:25 UTCEPSS rescore
  15. 2026-06-22 14:25 UTCEPSS rescore
  16. 2026-06-22 04:07 UTCEG score recompute
  17. 2026-06-21 14:56 UTCEPSS rescore
  18. 2026-06-21 14:56 UTCEPSS rescore
  19. 2026-06-21 01:59 UTCEPSS rescore
  20. 2026-06-21 01:59 UTCEPSS rescore
  21. 2026-06-20 22:48 UTCEG score recompute
  22. 2026-06-19 22:01 UTCEG score recompute
  23. 2026-06-19 19:26 UTCEPSS rescore
  24. 2026-06-19 19:26 UTCEPSS rescore
  25. 2026-06-18 21:30 UTCEG score recompute
  26. 2026-06-18 17:52 UTCEPSS rescore
  27. 2026-06-18 17:52 UTCEPSS rescore
  28. 2026-06-17 20:58 UTCEG score recompute
  29. 2026-06-17 17:53 UTCEPSS rescore
  30. 2026-06-16 20:27 UTCEG score recompute
  31. 2026-06-16 17:53 UTCEPSS rescore
  32. 2026-06-15 19:54 UTCEG score recompute▼ 1.00
  33. 2026-06-15 19:45 UTCNVD updateCVSS v3 → 5.3
  34. 2026-06-15 17:49 UTCEPSS rescore
  35. 2026-06-15 17:49 UTCEPSS rescore
  36. 2026-06-14 23:18 UTCEPSS rescore
  37. 2026-06-14 19:24 UTCEG score recompute
  38. 2026-06-13 23:00 UTCEPSS rescore
  39. 2026-06-13 18:53 UTCEG score recompute
  40. 2026-06-12 23:12 UTCEPSS rescore
  41. 2026-06-12 23:12 UTCEPSS rescore
  42. 2026-06-12 18:20 UTCEG score recompute
  43. 2026-06-11 17:49 UTCEG score recompute
  44. 2026-06-11 14:00 UTCEPSS rescore
  45. 2026-06-10 17:18 UTCEG score recompute
  46. 2026-06-10 17:18 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-48859?
CVE-2026-48859 is a medium vulnerability published on June 10, 2026. Observable Timing Discrepancy vulnerability in Erlang/OTP ssh (sshauth, sshoptions modules) allows unauthenticated remote username enumeration via timing side-channel in password authentication. When the SSH daemon is configured with the userpasswords or password option, sshauth:checkpassword/3…
When was CVE-2026-48859 disclosed?
CVE-2026-48859 was first published in the National Vulnerability Database on June 10, 2026, with the most recent update on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48859 actively exploited?
CVE-2026-48859 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48859?
CVE-2026-48859 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-48859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48859, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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