CVE-2026-39410

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

April 8, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jul 26, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Non-breaking space prefix bypass in cookie name handling in getCookie() · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4
github_release Patch Available

v4.12.12

Patch available: honojs/hono v4.12.12

https://github.com/honojs/hono/releases/tag/v4.12.12
github_commit Patch Available

commit cc067c855924 (honojs/hono)

Patch available: honojs/hono v4.12.12 (contains commit cc067c855924)

https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
hono—4.12.12—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× 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 103 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 08:46 UTCEG score recompute
  5. 2026-07-25 14:18 UTCEPSS rescore
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  7. 2026-07-24 14:17 UTCEPSS rescore
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  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 03:10 UTCEG score recompute
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-20 22:02 UTCOSV refresh
  15. 2026-07-20 17:08 UTCEPSS rescore
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  1. 2026-07-12 05:46 UTCEPSS rescore
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  3. 2026-07-09 19:10 UTCEPSS rescore
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  5. 2026-07-07 13:46 UTCEPSS rescore
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  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-25 13:49 UTCEPSS rescore
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  20. 2026-06-24 14:05 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
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  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
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  29. 2026-06-18 17:52 UTCEPSS rescore
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  35. 2026-06-13 23:00 UTCEPSS rescore
  36. 2026-06-12 23:12 UTCEPSS rescore
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  38. 2026-06-11 14:00 UTCEPSS rescore
  39. 2026-06-10 22:18 UTCEPSS rescore
  40. 2026-06-10 13:22 UTCEPSS rescore
  41. 2026-06-08 14:17 UTCEPSS rescore
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  43. 2026-06-07 15:25 UTCEPSS rescore
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  45. 2026-06-07 15:25 UTCEPSS rescore
  46. 2026-06-06 13:47 UTCEPSS rescore
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  48. 2026-06-05 22:47 UTCEPSS rescore
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  50. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 13:12 UTCEPSS rescore
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  54. 2026-06-02 20:13 UTCEPSS rescore
  55. 2026-06-01 13:52 UTCEPSS rescore
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  58. 2026-05-31 22:30 UTCEPSS rescore
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  60. 2026-05-31 00:16 UTCEPSS rescore
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  63. 2026-05-29 13:44 UTCEPSS rescore
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  65. 2026-05-28 13:44 UTCEPSS rescore
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  68. 2026-05-27 13:40 UTCEPSS rescore
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  71. 2026-05-26 13:44 UTCEPSS rescore
  72. 2026-05-26 07:18 UTCEPSS rescore
  73. 2026-05-26 07:18 UTCEPSS rescore
  74. 2026-05-20 22:38 UTCEPSS rescore
  75. 2026-05-20 22:38 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39410?
CVE-2026-39410 is a medium vulnerability published on April 8, 2026. Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to…
When was CVE-2026-39410 disclosed?
CVE-2026-39410 was first published in the National Vulnerability Database on April 8, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39410 actively exploited?
CVE-2026-39410 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.4% of all scored CVEs.
What is the CVSS score of CVE-2026-39410?
CVE-2026-39410 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-39410?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39410, 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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