CVE-2026-55706

HIGHNVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.3Exploit: None knownExposed: 0

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

sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity83% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

June 17, 2026

Last Modified

July 13, 2026

Advisory Details (4)

Auto-updated Jun 19, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic
https://blog.argus-systems.ai/blog/poc-001-pap-bypass.py
generic🟡 PoC Available

oss-security - OpenBSD sppp_pap_input: PAP authentication bypass

https://www.openwall.com/lists/oss-security/2026/06/16/9
github_commit

commit 076e2b1c1fc4 (openbsd/src)

Fix landed in openbsd/src commit 076e2b1c1fc4 — awaiting tagged release

https://github.com/openbsd/src/commit/076e2b1c1fc4ac0883a72d3544131ad5cee7adf8
generic🟡 PoC Available

A 27-Year-Old Authentication Bypass in OpenBSD's PPP Stack · Argus Blog

https://blog.argus-systems.ai/blog/openbsd-pap-27-year-auth-bypass.html

Vendor Advisories for CVE-2026-55706(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 94× 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.

Showing the most recent 100 of 189 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 22:27 UTCEG score recompute
  3. 2026-08-24 22:27 UTCGHSA enrichment
  4. 2026-08-24 07:01 UTCGHSA enrichment
  5. 2026-08-23 17:36 UTCGHSA enrichment
  6. 2026-08-23 04:31 UTCEG score recompute
  7. 2026-08-23 04:31 UTCGHSA enrichment
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 23:33 UTCGHSA enrichment
  10. 2026-08-21 10:28 UTCEG score recompute
  11. 2026-08-21 10:28 UTCGHSA enrichment
  12. 2026-08-20 22:55 UTCEPSS rescore
  13. 2026-08-20 21:22 UTCGHSA enrichment
  14. 2026-08-20 08:17 UTCEG score recompute
  15. 2026-08-20 08:17 UTCGHSA enrichment
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-19 08:13 UTCEG score recompute
  18. 2026-08-19 08:13 UTCGHSA enrichment
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 10:11 UTCGHSA enrichment
  22. 2026-08-16 21:06 UTCEG score recompute
  23. 2026-08-16 21:06 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 07:00 UTCEG score recompute
Show 75 more
  1. 2026-08-16 07:00 UTCGHSA enrichment
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 17:55 UTCGHSA enrichment
  4. 2026-08-15 04:49 UTCEG score recompute
  5. 2026-08-15 04:49 UTCGHSA enrichment
  6. 2026-08-15 01:30 UTCEPSS rescore
  7. 2026-08-14 15:39 UTCGHSA enrichment
  8. 2026-08-14 02:33 UTCEG score recompute
  9. 2026-08-14 02:33 UTCGHSA enrichment
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-13 13:28 UTCGHSA enrichment
  12. 2026-08-13 00:23 UTCEG score recompute
  13. 2026-08-13 00:23 UTCGHSA enrichment
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-12 11:18 UTCGHSA enrichment
  16. 2026-08-11 22:12 UTCEG score recompute
  17. 2026-08-11 22:12 UTCGHSA enrichment
  18. 2026-08-11 09:02 UTCEG score recompute
  19. 2026-08-11 09:02 UTCGHSA enrichment
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-10 19:57 UTCGHSA enrichment
  22. 2026-08-10 06:52 UTCGHSA enrichment
  23. 2026-08-09 17:47 UTCEG score recompute
  24. 2026-08-09 17:47 UTCGHSA enrichment
  25. 2026-08-09 13:46 UTCEPSS rescore
  26. 2026-08-09 04:42 UTCEG score recompute
  27. 2026-08-09 04:42 UTCGHSA enrichment
  28. 2026-08-08 16:37 UTCEPSS rescore
  29. 2026-08-08 15:37 UTCGHSA enrichment
  30. 2026-08-08 02:32 UTCEG score recompute
  31. 2026-08-08 02:32 UTCGHSA enrichment
  32. 2026-08-07 13:26 UTCGHSA enrichment
  33. 2026-08-07 00:22 UTCEG score recompute
  34. 2026-08-07 00:22 UTCGHSA enrichment
  35. 2026-08-06 13:47 UTCEPSS rescore
  36. 2026-08-06 11:15 UTCGHSA enrichment
  37. 2026-08-05 22:10 UTCEG score recompute
  38. 2026-08-05 22:10 UTCGHSA enrichment
  39. 2026-08-05 19:17 UTCEPSS rescore
  40. 2026-08-05 09:05 UTCGHSA enrichment
  41. 2026-08-04 15:27 UTCEG score recompute
  42. 2026-08-04 15:27 UTCGHSA enrichment
  43. 2026-08-04 15:10 UTCEPSS rescore
  44. 2026-08-04 10:39 UTCEPSS rescore
  45. 2026-08-03 23:02 UTCEG score recompute
  46. 2026-08-03 23:02 UTCGHSA enrichment
  47. 2026-08-03 10:36 UTCEPSS rescore
  48. 2026-08-03 09:56 UTCGHSA enrichment
  49. 2026-08-02 20:41 UTCGHSA enrichment
  50. 2026-08-02 07:36 UTCEG score recompute
  51. 2026-08-02 07:36 UTCGHSA enrichment
  52. 2026-08-02 02:27 UTCEPSS rescore
  53. 2026-08-01 18:30 UTCGHSA enrichment
  54. 2026-08-01 05:24 UTCEG score recompute
  55. 2026-08-01 05:24 UTCGHSA enrichment
  56. 2026-08-01 04:16 UTCEPSS rescore
  57. 2026-07-31 12:14 UTCGHSA enrichment
  58. 2026-07-30 22:43 UTCEG score recompute
  59. 2026-07-30 22:43 UTCGHSA enrichment
  60. 2026-07-30 16:28 UTCEPSS rescore
  61. 2026-07-30 04:35 UTCEG score recompute
  62. 2026-07-30 04:35 UTCGHSA enrichment
  63. 2026-07-30 01:30 UTCEPSS rescore
  64. 2026-07-29 15:28 UTCGHSA enrichment
  65. 2026-07-29 02:18 UTCEG score recompute
  66. 2026-07-29 02:17 UTCGHSA enrichment
  67. 2026-07-28 15:37 UTCEPSS rescore
  68. 2026-07-28 01:16 UTCEG score recompute
  69. 2026-07-28 01:16 UTCGHSA enrichment
  70. 2026-07-27 08:17 UTCGHSA enrichment
  71. 2026-07-26 19:12 UTCEG score recompute
  72. 2026-07-26 19:12 UTCGHSA enrichment
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-25 14:18 UTCEPSS rescore
  75. 2026-07-24 14:18 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-55706?
CVE-2026-55706 is a high vulnerability published on June 17, 2026. sppppapinput in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.
When was CVE-2026-55706 disclosed?
CVE-2026-55706 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55706 actively exploited?
CVE-2026-55706 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.9% of all scored CVEs.
What is the CVSS score of CVE-2026-55706?
CVE-2026-55706 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-55706?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55706, 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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