CVE-2026-41285

MEDIUMNVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 4.3 from GitHub Security Advisory published 2026-04-21. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2026-23996 (ENISA EUVD) · GHSA-h2gc-758g-276m (GitHub Security Advisories)Source: ENISA EUVD

4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.3Exploit: 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.

In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 21, 2026

Last Modified

April 24, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
Web page

RFC 4861: Neighbor Discovery for IP version 6 (IPv6) | RFC Editor

https://www.rfc-editor.org/rfc/rfc4861#section-4.6
Web page

OpenBSD 7.8 Errata

https://www.openbsd.org/errata78.html
GitHub commit

commit 086c5738bcd3 (openbsd/src)

Fix landed in openbsd/src commit 086c5738bcd3 — awaiting tagged release

https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 211 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 111 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-25 14:30 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-23 02:22 UTCEG score recompute
  10. 2026-10-23 02:22 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  11. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  13. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  16. 2026-10-18 03:42 UTCEG score recompute
  17. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  18. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  19. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  20. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  21. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  23. 2026-10-12 16:08 UTCEG score recompute
  24. 2026-10-11 19:50 UTCEG score recompute
  25. 2026-10-11 17:04 UTCEG score recompute
Show 75 more
  1. 2026-10-11 14:30 UTCEG score recompute
  2. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  8. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  11. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  14. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  26. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  29. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  31. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  32. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  34. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  35. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  36. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  37. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  38. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  39. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  40. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  41. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  42. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  43. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-08-16 06:21 UTCEG score recompute
  46. 2026-08-16 06:21 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  47. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  48. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-08-14 04:32 UTCEG score recompute
  50. 2026-08-14 04:32 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  52. 2026-08-12 18:42 UTCEG score recompute
  53. 2026-08-12 18:42 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  54. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  55. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  56. 2026-08-11 08:02 UTCEG score recompute
  57. 2026-08-11 08:02 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-10 05:53 UTCEG score recompute
  60. 2026-08-10 05:53 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  61. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  62. 2026-08-09 03:45 UTCEG score recompute
  63. 2026-08-09 03:45 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  65. 2026-08-07 13:09 UTCEG score recompute
  66. 2026-08-07 13:09 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  67. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  68. 2026-08-05 23:13 UTCEG score recompute
  69. 2026-08-05 23:13 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  71. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  72. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  73. 2026-08-03 21:25 UTCEG score recompute
  74. 2026-08-03 21:25 UTCGHSA enrichmentGHSA-h2gc-758g-276m · GitHub CVSS 4.3
  75. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 11th percentile

Frequently asked(5)

What is CVE-2026-41285?
CVE-2026-41285 is a medium-severity vulnerability; its CVE record was published on April 21, 2026. In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "ndoptlen * 8 - 2" expression with no preceding check for whether ndoptlen is zero.
When was the CVE record for CVE-2026-41285 published?
The CVE record for CVE-2026-41285 was published on April 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 24, 2026; the record at its source may have been updated since.
Is CVE-2026-41285 actively exploited?
CVE-2026-41285 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41285?
CVE-2026-41285 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-41285?
An upstream fix for CVE-2026-41285 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-41285

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