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 71% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.3Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
8.3HIGHmedium confidence
EG Risk
42
EG Risk 42/100

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%
EPSS PROB
0.3%
EPSS %ILE
25th
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 7× in last 7d / 27× 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 231 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-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?
An upstream fix for CVE-2026-55706 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-55706 are linked in the Vendor Advisories panel on this page.

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