CVE-2026-20688

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory

Also known asEUVD-2026-15059 (ENISA EUVD) · GHSA-8x27-8fvr-pw94 (GitHub Security Advisories)Source: ENISA EUVD

9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

A path handling issue was addressed with improved validation. This issue is fixed in iOS 26.4 and iPadOS 26.4, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4, visionOS 26.4. An app may be able to break out of its sandbox.

CVSS v3
9.3
EG Score
9.3CRITICALmedium 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)
Severity93% × 45%
Impact severity (EG Severity): CVSS 9.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
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 (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.

EG Severity
9.3 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). 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: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: 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).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

March 25, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Oct 8, 2026
Fix named in the CVE record.
Web page

About the security content of visionOS 26.4 - Apple Support

https://support.apple.com/en-us/126799
Web page

About the security content of macOS Sonoma 14.8.5 - Apple Support

https://support.apple.com/en-us/126796
Web page

About the security content of macOS Sequoia 15.7.5 - Apple Support

https://support.apple.com/en-us/126795
Web page

About the security content of macOS Tahoe 26.4 - Apple Support

https://support.apple.com/en-us/126794
Web page

About the security content of iOS 26.4 and iPadOS 26.4 - Apple Support

https://support.apple.com/en-us/126792

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 57× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 205 rows 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 105 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-11-12 16:21 UTCEchelonGraph re-scored
  3. 2026-11-12 16:21 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  4. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  5. 2026-11-11 14:12 UTCEchelonGraph re-scored
  6. 2026-11-11 14:12 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  7. 2026-11-10 16:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-11-10 12:06 UTCEchelonGraph re-scored
  9. 2026-11-10 12:06 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  10. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-11-09 10:01 UTCEchelonGraph re-scored
  12. 2026-11-09 10:01 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  13. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-11-08 07:55 UTCEchelonGraph re-scored
  15. 2026-11-08 07:55 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  16. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-11-07 05:50 UTCEchelonGraph re-scored
  18. 2026-11-07 05:50 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  19. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-11-06 03:46 UTCEchelonGraph re-scored
  21. 2026-11-06 03:46 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  22. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-11-05 01:42 UTCEchelonGraph re-scored
  24. 2026-11-05 01:42 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  25. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
Show 75 more
  1. 2026-11-03 23:37 UTCEchelonGraph re-scored
  2. 2026-11-03 23:37 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  3. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-11-02 21:32 UTCEchelonGraph re-scored
  5. 2026-11-02 21:32 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  6. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  7. 2026-11-01 19:26 UTCEchelonGraph re-scored
  8. 2026-11-01 19:26 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  9. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-31 17:21 UTCEchelonGraph re-scored
  11. 2026-10-31 17:21 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  12. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-30 15:17 UTCEchelonGraph re-scored
  15. 2026-10-30 15:17 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  16. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-29 13:12 UTCEchelonGraph re-scored
  18. 2026-10-29 13:12 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  19. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-10-28 11:04 UTCEchelonGraph re-scored
  21. 2026-10-28 11:04 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  22. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-10-27 08:10 UTCEchelonGraph re-scored
  24. 2026-10-27 08:10 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  25. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-10-26 03:49 UTCEchelonGraph re-scored
  27. 2026-10-26 03:49 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  28. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-10-25 14:43 UTCEchelonGraph re-scored
  30. 2026-10-25 01:44 UTCEchelonGraph re-scored
  31. 2026-10-25 01:44 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  32. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-10-23 23:40 UTCEchelonGraph re-scored
  34. 2026-10-23 23:40 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  35. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  36. 2026-10-22 21:35 UTCEchelonGraph re-scored
  37. 2026-10-22 21:34 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  38. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  39. 2026-10-21 19:28 UTCEchelonGraph re-scored
  40. 2026-10-21 19:28 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  41. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  42. 2026-10-20 17:23 UTCEchelonGraph re-scored
  43. 2026-10-20 17:23 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  44. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  45. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  46. 2026-10-19 15:16 UTCEchelonGraph re-scored
  47. 2026-10-19 15:16 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  48. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  49. 2026-10-18 13:11 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  50. 2026-10-18 03:56 UTCEchelonGraph re-scored
  51. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  52. 2026-10-17 11:06 UTCEchelonGraph re-scored
  53. 2026-10-17 11:06 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  54. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  55. 2026-10-16 09:01 UTCEchelonGraph re-scored
  56. 2026-10-16 09:01 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  57. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  58. 2026-10-15 06:56 UTCEchelonGraph re-scored
  59. 2026-10-15 06:55 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  60. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  61. 2026-10-14 02:45 UTCEchelonGraph re-scored
  62. 2026-10-14 02:45 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  63. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  64. 2026-10-12 22:52 UTCEchelonGraph re-scored
  65. 2026-10-12 22:52 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  66. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  67. 2026-10-12 16:23 UTCEchelonGraph re-scored
  68. 2026-10-12 09:22 UTCGHSA enrichmentGHSA-8x27-8fvr-pw94 · GitHub severity CRITICAL · GitHub CVSS 9.3
  69. 2026-10-11 20:05 UTCEchelonGraph re-scored
  70. 2026-10-11 17:18 UTCEchelonGraph re-scored
  71. 2026-10-11 14:50 UTCEchelonGraph re-scored
  72. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  73. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  74. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  75. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 18th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20688?
CVE-2026-20688 is a critical-severity vulnerability; its CVE record was published on March 25, 2026. A path handling issue was addressed with improved validation. This issue is fixed in iOS 26.4 and iPadOS 26.4, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4, visionOS 26.4. An app may be able to break out of its sandbox.
When was the CVE record for CVE-2026-20688 published?
The CVE record for CVE-2026-20688 was published on March 25, 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 17, 2026; the record at its source may have been updated since.
Is CVE-2026-20688 actively exploited?
CVE-2026-20688 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20688?
CVE-2026-20688 has a CVSS v3.1 base score of 9.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-20688?
The CVE record for CVE-2026-20688 names the fix: "This issue is fixed in iOS 26.4 and iPadOS 26.4, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4, visionOS 26.4."

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