CVE-2026-56763

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-07-11. A secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hono before 4.12.7 allows __proto__ key in parseBody with dot option enabled, permitting specially crafted form field names to create objects with __proto__ properties. When parsed results are merged into regular JavaScript objects using unsafe merge patterns, attackers can exploit this to achieve prototype pollution and modify object behavior.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100CISA SSVC

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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 11, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 11, 2026
Patch available. Sources: github.
generic

Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option
githubMentions a patch (unverified)

__proto__ key allowed in parseBody({ dot: true }) · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223

Vendor Advisories for CVE-2026-56763(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
hono—
  • every version up to 4.12.7: fixed in 4.12.7
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 41× 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 183 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-56763?
CVE-2026-56763 is a medium vulnerability published on July 11, 2026. Hono before 4.12.7 allows proto key in parseBody with dot option enabled, permitting specially crafted form field names to create objects with proto properties. When parsed results are merged into regular JavaScript objects using unsafe merge patterns, attackers can exploit this to achieve…
When was CVE-2026-56763 disclosed?
CVE-2026-56763 was first published on July 11, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56763 actively exploited?
CVE-2026-56763 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56763?
CVE-2026-56763 has a CVSS base score of 4.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56763?
A fix for CVE-2026-56763 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56763 are linked in the Vendor Advisories panel on this page.

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