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
Trending — 3 sources updated this week
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.3Exploit: None knownExposed: 0

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

Ladybird 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
8.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity83% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (3)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. No patch confirmed 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 22× in last 7d / 112× 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 192 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-58592?
CVE-2026-58592 is a high vulnerability published on July 1, 2026. Ladybird 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 createhostfunction, whose host…
When was CVE-2026-58592 disclosed?
CVE-2026-58592 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 2, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 57.5% of all scored CVEs.
What is the CVSS score of CVE-2026-58592?
CVE-2026-58592 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-58592?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58592, 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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