CVE-2026-58592

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
8.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.3Exploit: Elevated riskExposed services: Not assessed

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

Ladybird before commit 2f9dc7e contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to create_host_function, whose host callback captures and later reads that reference; once the ESM link-loop iteration ends the FunctionType is destroyed, leaving the callback with a dangling reference (the normal instantiate path uses a long-lived reference and is not affected). Stale result-type data lets the host callback return an empty result vector for a statically non-empty result, so the destination register retains an attacker-influenced value that is then consumed by the WASM-GC array.set handler, which bit-casts the reference low bits to an ArrayInstance pointer after only a null check, yielding an arbitrary write. A web page can chain this into code execution in the WebContent process. Verified reachable from HTML content without any instrumentation or source modification.

CVSS v3
8.3
EG Score
8.3HIGHmedium confidence
EG Risk
53
EG Risk 53/100

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
Severity83% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

Published

July 1, 2026

Last Modified

September 11, 2026

Advisory Details (3)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. No fix on record yet.
generic🟡 PoC Available

Ladybird - Web-Reachable Code Execution via Dangling FunctionType Reference in WebAssembly ESM Integration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ladybird-web-reachable-code-execution-via-dangling-functiontype-reference-in-webassembly-esm-integration
generic

exploitarium/ladybird-wasm-esm-host-function-rce-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/ladybird-wasm-esm-host-function-rce-poc
generic

ladybird/Libraries/LibWeb/WebAssembly/WebAssemblyModule.cpp at master · LadybirdBrowser/ladybird · GitHub

https://github.com/LadybirdBrowser/ladybird/blob/master/Libraries/LibWeb/WebAssembly/WebAssemblyModule.cpp

Vendor Advisories for CVE-2026-58592(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 39× 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 253 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-02 17:56 UTCEPSS rescore
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-29 15:22 UTCEPSS rescore
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-24 14:04 UTCEPSS rescore
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 06:49 UTCEG score recompute
  18. 2026-09-23 06:49 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 06:28 UTCEG score recompute
  22. 2026-09-18 06:28 UTCGHSA enrichment
  23. 2026-09-17 19:31 UTCEPSS rescore
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-14 00:21 UTCEG score recompute
  3. 2026-09-14 00:21 UTCGHSA enrichment
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-13 09:07 UTCEG score recompute
  6. 2026-09-13 09:07 UTCGHSA enrichment
  7. 2026-09-12 14:37 UTCEG score recompute
  8. 2026-09-12 14:37 UTCGHSA enrichment
  9. 2026-09-11 15:31 UTCEG score recompute
  10. 2026-09-11 15:31 UTCGHSA enrichment
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 14:44 UTCEG score recompute
  13. 2026-09-11 14:44 UTCGHSA enrichment
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-07 16:01 UTCEPSS rescore
  17. 2026-09-06 14:26 UTCEG score recompute
  18. 2026-09-06 14:26 UTCGHSA enrichment
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-06 00:45 UTCEG score recompute
  21. 2026-09-06 00:45 UTCGHSA enrichment
  22. 2026-09-04 05:07 UTCEPSS rescore
  23. 2026-09-02 14:12 UTCEPSS rescore
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-08-30 22:36 UTCEG score recompute
  27. 2026-08-30 22:36 UTCGHSA enrichment
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 11:43 UTCEG score recompute
  30. 2026-08-30 11:43 UTCGHSA enrichment
  31. 2026-08-30 01:22 UTCEPSS rescore
  32. 2026-08-28 21:42 UTCEPSS rescore
  33. 2026-08-27 22:24 UTCEG score recompute
  34. 2026-08-27 22:24 UTCGHSA enrichment
  35. 2026-08-27 14:25 UTCEPSS rescore
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-25 13:49 UTCEPSS rescore
  38. 2026-08-25 07:52 UTCGHSA enrichment
  39. 2026-08-24 20:58 UTCEG score recompute
  40. 2026-08-24 20:58 UTCGHSA enrichment
  41. 2026-08-24 04:33 UTCGHSA enrichment
  42. 2026-08-23 17:39 UTCGHSA enrichment
  43. 2026-08-23 06:46 UTCEG score recompute
  44. 2026-08-23 06:46 UTCGHSA enrichment
  45. 2026-08-23 00:19 UTCEPSS rescore
  46. 2026-08-22 19:53 UTCGHSA enrichment
  47. 2026-08-22 06:58 UTCEG score recompute
  48. 2026-08-22 06:58 UTCGHSA enrichment
  49. 2026-08-21 23:49 UTCEPSS rescore
  50. 2026-08-21 15:23 UTCGHSA enrichment
  51. 2026-08-21 04:30 UTCEG score recompute
  52. 2026-08-21 04:30 UTCGHSA enrichment
  53. 2026-08-20 22:55 UTCEPSS rescore
  54. 2026-08-20 15:53 UTCGHSA enrichment
  55. 2026-08-20 04:36 UTCEG score recompute
  56. 2026-08-20 04:36 UTCGHSA enrichment
  57. 2026-08-19 17:04 UTCEPSS rescore
  58. 2026-08-19 09:53 UTCGHSA enrichment
  59. 2026-08-18 22:54 UTCEG score recompute
  60. 2026-08-18 22:54 UTCGHSA enrichment
  61. 2026-08-18 13:48 UTCEPSS rescore
  62. 2026-08-18 11:57 UTCGHSA enrichment
  63. 2026-08-17 23:20 UTCEG score recompute
  64. 2026-08-17 23:20 UTCGHSA enrichment
  65. 2026-08-17 13:47 UTCEPSS rescore
  66. 2026-08-17 12:26 UTCGHSA enrichment
  67. 2026-08-17 01:28 UTCEG score recompute
  68. 2026-08-17 01:28 UTCGHSA enrichment
  69. 2026-08-16 14:56 UTCEPSS rescore
  70. 2026-08-16 14:35 UTCGHSA enrichment
  71. 2026-08-16 03:42 UTCEG score recompute
  72. 2026-08-16 03:42 UTCGHSA enrichment
  73. 2026-08-16 02:14 UTCEPSS rescore
  74. 2026-08-15 16:49 UTCGHSA enrichment
  75. 2026-08-15 05:56 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58592?
CVE-2026-58592 is a high vulnerability published on July 1, 2026. Ladybird before commit 2f9dc7e contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to…
When was CVE-2026-58592 disclosed?
CVE-2026-58592 was first published on July 1, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58592 actively exploited?
CVE-2026-58592 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58592?
CVE-2026-58592 has a CVSS base score of 8.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58592?
No fix for CVE-2026-58592 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-58592 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-58592

Explore →

Is Your Infrastructure Affected by CVE-2026-58592?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs