CVE-2026-42494

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

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

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:

* The directory loop itself assumes a good record length. This is CVE-2026-42494.

* The calculation of the System Use area may underflow. This is CVE-2026-42495.

* The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423.

* The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424.

* The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

XSA-497 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-497.html

Vendor Advisories for CVE-2026-42494(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen4.14.2+25-gb6a8c4f72d-2 ... 4.20.3+127-gc42374a105-1 (46 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen4.17.1+2-gb773c48e36-1 ... 4.20.3+127-gc42374a105-1 (25 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1 ... 4.20.3+127-gc42374a105-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 80× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:35 UTCEG score recompute
  3. 2026-08-29 23:35 UTCGHSA enrichment
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-27 09:37 UTCEG score recompute
  7. 2026-08-27 09:37 UTCGHSA enrichment
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-26 08:56 UTCEG score recompute
  10. 2026-08-26 08:56 UTCGHSA enrichment
  11. 2026-08-25 13:49 UTCEPSS rescore
  12. 2026-08-25 09:11 UTCEG score recompute
  13. 2026-08-25 09:11 UTCGHSA enrichment
  14. 2026-08-24 09:27 UTCEG score recompute
  15. 2026-08-24 09:27 UTCGHSA enrichment
  16. 2026-08-23 09:42 UTCEG score recompute
  17. 2026-08-23 09:42 UTCGHSA enrichment
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-22 09:58 UTCEG score recompute
  20. 2026-08-22 09:58 UTCGHSA enrichment
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-21 10:13 UTCEG score recompute
  23. 2026-08-21 10:13 UTCGHSA enrichment
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-20 10:28 UTCEG score recompute
Show 67 more
  1. 2026-08-20 10:28 UTCGHSA enrichment
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-19 10:43 UTCEG score recompute
  4. 2026-08-19 10:43 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-18 10:58 UTCEG score recompute
  7. 2026-08-18 10:58 UTCGHSA enrichment
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-17 11:14 UTCEG score recompute
  10. 2026-08-17 11:14 UTCGHSA enrichment
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 11:28 UTCEG score recompute
  13. 2026-08-16 11:28 UTCGHSA enrichment
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 11:44 UTCEG score recompute
  16. 2026-08-15 11:44 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 12:00 UTCEG score recompute
  19. 2026-08-14 12:00 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 12:15 UTCEG score recompute
  22. 2026-08-13 12:15 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 12:31 UTCEG score recompute
  25. 2026-08-12 12:31 UTCGHSA enrichment
  26. 2026-08-11 13:43 UTCEPSS rescore
  27. 2026-08-11 12:46 UTCEG score recompute
  28. 2026-08-11 12:46 UTCGHSA enrichment
  29. 2026-08-11 00:00 UTCEPSS rescore
  30. 2026-08-10 13:01 UTCEG score recompute
  31. 2026-08-10 13:01 UTCGHSA enrichment
  32. 2026-08-09 13:46 UTCEPSS rescore
  33. 2026-08-09 13:17 UTCEG score recompute
  34. 2026-08-09 13:17 UTCGHSA enrichment
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-08 13:33 UTCEG score recompute
  37. 2026-08-08 13:33 UTCGHSA enrichment
  38. 2026-08-07 13:48 UTCGHSA enrichment
  39. 2026-08-06 14:04 UTCEG score recompute
  40. 2026-08-06 14:04 UTCGHSA enrichment
  41. 2026-08-06 13:46 UTCEPSS rescore
  42. 2026-08-05 19:17 UTCEPSS rescore
  43. 2026-08-05 14:19 UTCGHSA enrichment
  44. 2026-08-04 14:34 UTCGHSA enrichment
  45. 2026-08-03 14:49 UTCEG score recompute
  46. 2026-08-03 14:49 UTCGHSA enrichment
  47. 2026-08-03 10:36 UTCEPSS rescore
  48. 2026-08-02 15:05 UTCEG score recompute
  49. 2026-08-02 15:05 UTCGHSA enrichment
  50. 2026-08-02 02:27 UTCEPSS rescore
  51. 2026-08-01 15:21 UTCEG score recompute
  52. 2026-08-01 15:21 UTCGHSA enrichment
  53. 2026-08-01 04:16 UTCEPSS rescore
  54. 2026-07-31 15:37 UTCEG score recompute
  55. 2026-07-31 15:37 UTCGHSA enrichment
  56. 2026-07-30 16:28 UTCEPSS rescore
  57. 2026-07-30 15:52 UTCEG score recompute
  58. 2026-07-30 15:52 UTCGHSA enrichment
  59. 2026-07-30 01:30 UTCEPSS rescore
  60. 2026-07-29 16:07 UTCEG score recompute
  61. 2026-07-29 16:06 UTCGHSA enrichment
  62. 2026-07-28 16:21 UTCGHSA enrichment
  63. 2026-07-28 15:30 UTCEG score recompute▲ 6.10
  64. 2026-07-28 15:29 UTCMITRE cvelistV5CVSS v3 → 6.1 · severity → MEDIUM
  65. 2026-07-28 13:31 UTCNVD update
  66. 2026-07-28 13:05 UTCEG score recompute
  67. 2026-07-28 13:03 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42494?
CVE-2026-42494 is a medium vulnerability published on July 28, 2026. [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:…
When was CVE-2026-42494 disclosed?
CVE-2026-42494 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42494 actively exploited?
CVE-2026-42494 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.6% of all scored CVEs.
What is the CVSS score of CVE-2026-42494?
CVE-2026-42494 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42494?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42494, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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