CVE-2026-26833

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-25. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

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

thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

March 25, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GitHub - zebbernCVE/CVE-2026-26833: Advisory for thumbler · GitHub

https://github.com/zebbernCVE/CVE-2026-26833
generic

GitHub - mmahrous/thumbler: This package will extract thumbnail from video · GitHub

https://github.com/mmahrous/thumbler

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
npmthumbler—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)
npm(1)
PackageVulnerable rangeFixed inDependents
thumbler———

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 25× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:11 UTCEPSS rescore
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-25 13:48 UTCEPSS rescore
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 69 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 10:22 UTCEG score recompute
  7. 2026-08-16 10:22 UTCGHSA enrichment
  8. 2026-08-16 02:14 UTCEPSS rescore
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-14 23:52 UTCGHSA enrichment
  11. 2026-08-14 19:34 UTCGHSA enrichment
  12. 2026-08-14 15:17 UTCGHSA enrichment
  13. 2026-08-14 10:59 UTCGHSA enrichment
  14. 2026-08-14 06:41 UTCEG score recompute
  15. 2026-08-14 06:41 UTCGHSA enrichment
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 01:14 UTCGHSA enrichment
  18. 2026-08-12 20:56 UTCEG score recompute
  19. 2026-08-12 20:56 UTCGHSA enrichment
  20. 2026-08-12 13:50 UTCEPSS rescore
  21. 2026-08-12 01:16 UTCGHSA enrichment
  22. 2026-08-11 20:58 UTCEG score recompute
  23. 2026-08-11 20:58 UTCGHSA enrichment
  24. 2026-08-11 13:42 UTCEPSS rescore
  25. 2026-08-11 08:27 UTCGHSA enrichment
  26. 2026-08-11 04:02 UTCEG score recompute
  27. 2026-08-11 04:02 UTCGHSA enrichment
  28. 2026-08-11 00:00 UTCEPSS rescore
  29. 2026-08-10 12:12 UTCGHSA enrichment
  30. 2026-08-10 06:28 UTCGHSA enrichment
  31. 2026-08-10 02:10 UTCGHSA enrichment
  32. 2026-08-09 21:51 UTCGHSA enrichment
  33. 2026-08-09 17:34 UTCEG score recompute
  34. 2026-08-09 17:34 UTCGHSA enrichment
  35. 2026-08-09 13:46 UTCEPSS rescore
  36. 2026-08-09 13:16 UTCGHSA enrichment
  37. 2026-08-09 06:14 UTCEG score recompute
  38. 2026-08-09 06:14 UTCGHSA enrichment
  39. 2026-08-08 16:37 UTCEPSS rescore
  40. 2026-08-08 09:45 UTCGHSA enrichment
  41. 2026-08-08 05:27 UTCGHSA enrichment
  42. 2026-08-08 01:09 UTCGHSA enrichment
  43. 2026-08-07 20:51 UTCGHSA enrichment
  44. 2026-08-07 16:33 UTCEG score recompute
  45. 2026-08-07 16:33 UTCGHSA enrichment
  46. 2026-08-06 19:00 UTCEG score recompute
  47. 2026-08-06 19:00 UTCGHSA enrichment
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-06 09:39 UTCGHSA enrichment
  50. 2026-08-06 05:21 UTCGHSA enrichment
  51. 2026-08-06 01:03 UTCEG score recompute
  52. 2026-08-06 01:03 UTCGHSA enrichment
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-04 15:10 UTCEPSS rescore
  55. 2026-08-04 04:08 UTCGHSA enrichment
  56. 2026-08-03 23:49 UTCEG score recompute
  57. 2026-08-03 23:49 UTCGHSA enrichment
  58. 2026-08-03 10:36 UTCEPSS rescore
  59. 2026-08-03 00:56 UTCGHSA enrichment
  60. 2026-08-02 19:54 UTCGHSA enrichment
  61. 2026-08-02 15:36 UTCEG score recompute
  62. 2026-08-02 15:36 UTCGHSA enrichment
  63. 2026-08-02 02:26 UTCEPSS rescore
  64. 2026-08-01 04:16 UTCEPSS rescore
  65. 2026-07-30 16:27 UTCEPSS rescore
  66. 2026-07-30 01:30 UTCEPSS rescore
  67. 2026-07-28 15:36 UTCEPSS rescore
  68. 2026-07-27 14:25 UTCEG score recompute
  69. 2026-07-27 14:25 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-26833?
CVE-2026-26833 is a critical vulnerability published on March 25, 2026. thumbler through 1.1.2 allows OS command injection via the input, output, time, or size parameter in the thumbnail() function because user input is concatenated into a shell command string passed to child_process.exec() without proper sanitization or escaping.
When was CVE-2026-26833 disclosed?
CVE-2026-26833 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26833 actively exploited?
CVE-2026-26833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 17.4% of all scored CVEs.
What is the CVSS score of CVE-2026-26833?
CVE-2026-26833 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-26833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26833, 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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