CVE-2026-79608

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-13. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; 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-2026-98824 (ENISA EUVD) · GHSA-979q-v7jv-rjpg (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa.

For more details, see: http://xenbits.xen.org/xsa/advisory-433.html

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 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.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
27th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 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 2026-11-12). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days 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; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

October 13, 2026

Last Modified

October 20, 2026

Advisory Details (2)

Auto-updated Nov 7, 2026
Patch available.
Web page

XSA-515 - Xen Security Advisories

http://xenbits.xen.org/xsa/advisory-515.html
Web page

XSA-515 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-515.html

Vendor Advisories for CVE-2026-79608(1)

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

Affected Packages

(6 across 6 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.19.6-r2: fixed in 4.19.6-r2
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.20.4-r2: fixed in 4.20.4-r2
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.20.4-r2: fixed in 4.20.4-r2
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.21.2-r2: fixed in 4.21.2-r2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.20.0+68-g35cb38b222-1 ... 4.20.3+127-gc42374a105-1 (8 versions)
  • every version up to 4.20.4+39-gf1e1321c87-0+deb13u1: fixed in 4.20.4+39-gf1e1321c87-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.20.0+68-g35cb38b222-1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-2, 4.20.3+127-gc42374a105-1
  • every version up to 4.20.4+39-gf1e1321c87-1: fixed in 4.20.4+39-gf1e1321c87-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 58× 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.

  1. 2026-11-12 18:33 UTCEchelonGraph re-scored
  2. 2026-11-12 18:33 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  4. 2026-11-12 12:21 UTCEchelonGraph re-scored
  5. 2026-11-12 12:21 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  7. 2026-11-11 12:39 UTCEchelonGraph re-scored
  8. 2026-11-11 12:39 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  10. 2026-11-10 12:56 UTCEchelonGraph re-scored
  11. 2026-11-10 12:56 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  13. 2026-11-09 13:14 UTCEchelonGraph re-scored
  14. 2026-11-09 13:14 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  16. 2026-11-08 13:31 UTCEchelonGraph re-scored
  17. 2026-11-08 13:31 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  19. 2026-11-07 13:48 UTCEchelonGraph re-scored
  20. 2026-11-07 13:48 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  22. 2026-11-06 14:06 UTCEchelonGraph re-scored
  23. 2026-11-06 14:06 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  25. 2026-11-05 14:23 UTCEchelonGraph re-scored
Show 63 more
  1. 2026-11-05 14:23 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-11-04 14:41 UTCEchelonGraph re-scored
  4. 2026-11-04 14:41 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  6. 2026-11-03 14:58 UTCEchelonGraph re-scored
  7. 2026-11-03 14:58 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  9. 2026-11-02 15:13 UTCEchelonGraph re-scored
  10. 2026-11-02 15:13 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-11-01 15:31 UTCEchelonGraph re-scored
  13. 2026-11-01 15:31 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-31 15:49 UTCEchelonGraph re-scored
  16. 2026-10-31 15:49 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-30 16:06 UTCEchelonGraph re-scored
  19. 2026-10-30 16:06 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-10-29 16:24 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-28 16:41 UTCEchelonGraph re-scored
  23. 2026-10-28 16:41 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-10-27 16:58 UTCEchelonGraph re-scored
  26. 2026-10-27 16:58 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  28. 2026-10-26 17:13 UTCEchelonGraph re-scored
  29. 2026-10-26 17:13 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  31. 2026-10-25 17:10 UTCEchelonGraph re-scored
  32. 2026-10-25 17:10 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  34. 2026-10-25 13:59 UTCEchelonGraph re-scored
  35. 2026-10-24 17:28 UTCEchelonGraph re-scored
  36. 2026-10-24 17:28 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  38. 2026-10-23 17:44 UTCEchelonGraph re-scored
  39. 2026-10-23 17:44 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  41. 2026-10-22 18:01 UTCEchelonGraph re-scored
  42. 2026-10-22 18:01 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  43. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  44. 2026-10-21 18:09 UTCEchelonGraph re-scored
  45. 2026-10-21 18:09 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  47. 2026-10-20 18:26 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg
  48. 2026-10-20 17:48 UTCEchelonGraph re-scoredFirst assessed: 9.8 CRITICAL
  49. 2026-10-20 17:48 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg
  50. 2026-10-20 17:46 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  51. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  52. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  53. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  54. 2026-10-18 03:10 UTCEchelonGraph re-scored
  55. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  56. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  57. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  58. 2026-10-14 18:45 UTCEchelonGraph re-scored
  59. 2026-10-14 18:45 UTCGHSA enrichmentGHSA-979q-v7jv-rjpg
  60. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  61. 2026-10-13 16:25 UTCNVD update
  62. 2026-10-13 15:56 UTCEchelonGraph re-scored
  63. 2026-10-13 15:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-79608?
CVE-2026-79608 is a critical-severity vulnerability; its CVE record was published on October 13, 2026. The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see:…
When was CVE-2026-79608 made public?
CVE-2026-79608 was made public on October 13, 2026: that is the date its CVE record's CNA, Xen Project, gives for when the vulnerability was made public. The CVE record itself was published on October 13, 2026. EchelonGraph's copy of the record carries a last-modified date of October 20, 2026; the record at its source may have been updated since.
Is CVE-2026-79608 actively exploited?
CVE-2026-79608 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-79608?
CVE-2026-79608 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-79608?
A fix for CVE-2026-79608 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-79608 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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