CVE-2026-46690

MEDIUMNVD 5.85.8
EchelonGraph scoreMEDIUM confidence

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

Score 5.8 from GitHub Security Advisory published 2026-05-29. NVD baseline CVSS 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated
5.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.8Exploit: No code on recordExposed services: Not assessed

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

unbounded_spsc is an "unbounded" extension of bounded_spsc_queue. In versions 0.2.0 and prior, sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race. At time of publication, there are no publicly available patches.

CVSS v3
5.8
EG Score
5.8MEDIUMmedium confidence
EG Risk
42
EG Risk 42/100

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)
Severity58% × 45%
Impact severity (EG Severity): CVSS 5.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
1st
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 (5.8): severity, escalated by confirmed exploitation. This CVE's 5.8 is its impact severity (EG Severity), not escalated.

EG Severity
5.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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 low or medium mission impact; Track* at high (mission-essential systems).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 low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (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

May 29, 2026

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)

Sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race · Advisory · spearman/unbounded-spsc · GitHub

https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6

Vendor Advisories for CVE-2026-46690(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
rustunbounded-spsc—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
unbounded-spsc—
  • every version through 0.2.0: no fix on record
—

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 30× 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 199 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 99 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-18 03:36 UTCEG score recompute
  4. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-12 16:01 UTCEG score recompute
  10. 2026-10-12 16:01 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  11. 2026-10-11 19:45 UTCEG score recompute
  12. 2026-10-11 16:59 UTCEG score recompute
  13. 2026-10-11 14:24 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 75 more
  1. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-09-14 06:23 UTCEG score recompute
  11. 2026-09-14 06:23 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  27. 2026-08-25 04:18 UTCEG score recompute
  28. 2026-08-25 04:18 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  29. 2026-08-23 14:11 UTCEG score recompute
  30. 2026-08-23 14:11 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  31. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-08-21 15:00 UTCEG score recompute
  34. 2026-08-21 15:00 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  35. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-08-20 10:25 UTCEG score recompute
  37. 2026-08-20 10:25 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  38. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-17 06:51 UTCEG score recompute
  42. 2026-08-17 06:51 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  43. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-08-16 03:55 UTCEG score recompute
  45. 2026-08-16 03:55 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  46. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-08-15 02:11 UTCEG score recompute
  48. 2026-08-15 02:11 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  49. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-08-14 00:28 UTCEG score recompute
  51. 2026-08-14 00:28 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  52. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-08-12 11:24 UTCEG score recompute
  55. 2026-08-12 11:24 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  56. 2026-08-11 09:37 UTCEG score recompute
  57. 2026-08-11 09:37 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-08-10 07:42 UTCEG score recompute
  60. 2026-08-10 07:42 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  61. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-09 05:59 UTCEG score recompute
  63. 2026-08-09 05:59 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-08-08 04:16 UTCEG score recompute
  66. 2026-08-08 04:16 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  67. 2026-08-07 02:32 UTCEG score recompute
  68. 2026-08-07 02:32 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  69. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  70. 2026-08-06 00:49 UTCEG score recompute
  71. 2026-08-06 00:49 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  72. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  73. 2026-08-04 23:06 UTCEG score recompute
  74. 2026-08-04 23:05 UTCGHSA enrichmentGHSA-6m57-8r3p-pqx6 · GitHub CVSS 5.8
  75. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

Frequently asked(5)

What is CVE-2026-46690?
CVE-2026-46690 is a medium-severity vulnerability; its CVE record was published on May 29, 2026. unboundedspsc is an "unbounded" extension of boundedspsc_queue. In versions 0.2.0 and prior, sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race. At time of publication, there are no publicly available patches.
When was the CVE record for CVE-2026-46690 published?
The CVE record for CVE-2026-46690 was published on May 29, 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 June 16, 2026; the record at its source may have been updated since.
Is CVE-2026-46690 actively exploited?
CVE-2026-46690 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-46690?
CVE-2026-46690 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-46690?
No fix for CVE-2026-46690 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-46690 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-46690

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