CVE-2026-0821

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A vulnerability was determined in quickjs-ng quickjs up to 0.11.0. This vulnerability affects the function js_typed_array_constructor of the file quickjs.c. Executing a manipulation can lead to heap-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. This patch is called c5d80831e51e48a83eab16ea867be87f091783c5. A patch should be applied to remediate this issue.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

January 10, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Sep 15, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_pr

Fix heap buffer overflow via side-effects in js_typed_array_constructor

Fix merged in quickjs-ng/quickjs PR #1299 on 2026-01-07 — awaiting tagged release

https://github.com/quickjs-ng/quickjs/pull/1299
generic

Heap buffer overflow via side-effects in js_typed_array_constructor · Issue #1296 · quickjs-ng/quickjs · GitHub

https://github.com/quickjs-ng/quickjs/issues/1296#issue-3780003395
generic

Heap buffer overflow via side-effects in js_typed_array_constructor · Issue #1296 · quickjs-ng/quickjs · GitHub

https://github.com/quickjs-ng/quickjs/issues/1296
github_commit

commit c5d80831e51e (quickjs-ng/quickjs)

Fix landed in quickjs-ng/quickjs commit c5d80831e51e — awaiting tagged release

https://github.com/quickjs-ng/quickjs/commit/c5d80831e51e48a83eab16ea867be87f091783c5
generic

GitHub - quickjs-ng/quickjs: QuickJS, the Next Generation: a mighty JavaScript engine · GitHub

https://github.com/quickjs-ng/quickjs/

Affected Packages

(4 across 4 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
quickjs-ng—0.11.0-r1—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
quickjs-ng—0.11.0-r2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
quickjs2025.04.26-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
quickjs2025.04.26-1——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 23× 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.

Showing the most recent 100 of 167 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-19 18:30 UTCOSV refresh
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-16 05:14 UTCEPSS rescore
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-12 15:00 UTCEPSS rescore
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  17. 2026-08-31 21:34 UTCOSV refresh
  18. 2026-08-30 19:17 UTCEPSS rescore
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  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-18 13:48 UTCEPSS rescore
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 02:14 UTCEPSS rescore
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 23:32 UTCGHSA enrichment
  7. 2026-08-14 15:07 UTCEG score recompute
  8. 2026-08-14 15:07 UTCGHSA enrichment
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-12 13:50 UTCEPSS rescore
  11. 2026-08-11 13:42 UTCEPSS rescore
  12. 2026-08-10 23:59 UTCEPSS rescore
  13. 2026-08-10 00:41 UTCGHSA enrichment
  14. 2026-08-09 20:35 UTCEG score recompute
  15. 2026-08-09 20:35 UTCGHSA enrichment
  16. 2026-08-09 13:46 UTCEPSS rescore
  17. 2026-08-08 16:37 UTCEPSS rescore
  18. 2026-08-08 09:16 UTCGHSA enrichment
  19. 2026-08-08 05:10 UTCGHSA enrichment
  20. 2026-08-08 01:04 UTCEG score recompute
  21. 2026-08-08 01:04 UTCGHSA enrichment
  22. 2026-08-06 13:46 UTCEPSS rescore
  23. 2026-08-06 06:02 UTCEG score recompute▲ 2.50
  24. 2026-08-06 06:02 UTCGHSA enrichment
  25. 2026-08-05 19:17 UTCEPSS rescore
  26. 2026-08-04 15:09 UTCEPSS rescore
  27. 2026-08-04 10:38 UTCEPSS rescore
  28. 2026-08-03 10:35 UTCEPSS rescore
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  31. 2026-07-30 16:27 UTCEPSS rescore
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  35. 2026-07-27 02:09 UTCOSV refresh
  36. 2026-07-26 14:54 UTCEPSS rescore
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  38. 2026-07-25 14:17 UTCEPSS rescore
  39. 2026-07-24 14:17 UTCEPSS rescore
  40. 2026-07-23 14:18 UTCEPSS rescore
  41. 2026-07-23 03:04 UTCEG score recompute
  42. 2026-07-22 14:08 UTCEPSS rescore
  43. 2026-07-21 15:24 UTCEPSS rescore
  44. 2026-07-20 17:08 UTCEPSS rescore
  45. 2026-07-19 14:30 UTCEPSS rescore
  46. 2026-07-19 02:28 UTCEPSS rescore
  47. 2026-07-18 10:04 UTCEPSS rescore
  48. 2026-07-16 17:02 UTCEPSS rescore
  49. 2026-07-15 16:57 UTCEPSS rescore
  50. 2026-07-15 02:00 UTCEPSS rescore
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  52. 2026-07-13 06:12 UTCEPSS rescore
  53. 2026-07-12 05:46 UTCEPSS rescore
  54. 2026-07-11 08:27 UTCEPSS rescore
  55. 2026-07-09 20:45 UTCOSV refresh
  56. 2026-07-09 19:10 UTCEPSS rescore
  57. 2026-07-08 15:15 UTCEPSS rescore
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  59. 2026-07-07 13:46 UTCEPSS rescore
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  65. 2026-07-01 15:06 UTCEPSS rescore
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  67. 2026-06-30 23:22 UTCEPSS rescore
  68. 2026-06-29 14:06 UTCEPSS rescore
  69. 2026-06-28 14:07 UTCEPSS rescore
  70. 2026-06-28 04:56 UTCEPSS rescore
  71. 2026-06-28 04:56 UTCEPSS rescore
  72. 2026-06-27 03:08 UTCEPSS rescore
  73. 2026-06-25 13:49 UTCEPSS rescore
  74. 2026-06-24 14:05 UTCEPSS rescore
  75. 2026-06-23 21:32 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-0821?
CVE-2026-0821 is a critical vulnerability published on January 10, 2026. A vulnerability was determined in quickjs-ng quickjs up to 0.11.0. This vulnerability affects the function jstypedarray_constructor of the file quickjs.c. Executing a manipulation can lead to heap-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed…
When was CVE-2026-0821 disclosed?
CVE-2026-0821 was first published in the National Vulnerability Database on January 10, 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-2026-0821 actively exploited?
CVE-2026-0821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.9% of all scored CVEs.
What is the CVSS score of CVE-2026-0821?
CVE-2026-0821 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-0821?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0821, 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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