CVE-2026-29086

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (13th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-9508 (ENISA EUVD)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, the setCookie() utility did not validate semicolons (;), carriage returns (\r), or newline characters (\n) in the domain and path options when constructing the Set-Cookie header. Because cookie attributes are delimited by semicolons, this could allow injection of additional cookie attributes if untrusted input was passed into these fields. This issue has been patched in version 4.12.4.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 4, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Cookie Attribute Injection via Unsanitized domain and path in setCookie() · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
GitHub commit Patch Available

commit 44ae0c8cc4d5 (honojs/hono)

Patch available: honojs/hono v4.12.6 (contains commit 44ae0c8cc4d5)

https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
hono—
  • every version up to 4.12.4: fixed in 4.12.4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 35× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 98 are merged into the row they repeat.

  1. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-10-25 14:37 UTCEG score recompute
  3. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-23 03:57 UTCEG score recompute
  6. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-10-18 03:49 UTCEG score recompute
  12. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-10-12 16:16 UTCEG score recompute
  19. 2026-10-11 19:58 UTCEG score recompute
  20. 2026-10-11 17:11 UTCEG score recompute
  21. 2026-10-11 14:41 UTCEG score recompute
  22. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  23. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Show 69 more
  1. 2026-10-08 12:54 UTCOSV refresh
  2. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  3. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  7. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  12. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-18 18:36 UTCOSV refresh
  15. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  26. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  27. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-08-30 21:34 UTCOSV refresh
  29. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  30. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  31. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  32. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  33. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  34. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  35. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  36. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  38. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  39. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  40. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  41. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  42. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  43. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  44. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  45. 2026-08-14 08:33 UTCEG score recompute
  46. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  47. 2026-08-13 01:15 UTCEG score recompute
  48. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  49. 2026-08-11 23:13 UTCEG score recompute
  50. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  51. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  52. 2026-08-10 10:14 UTCEG score recompute
  53. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  54. 2026-08-09 08:11 UTCEG score recompute
  55. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  56. 2026-08-07 20:01 UTCEG score recompute
  57. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  58. 2026-08-06 02:40 UTCEG score recompute
  59. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  60. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-08-04 02:30 UTCEG score recompute
  62. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  63. 2026-08-02 18:56 UTCEG score recompute
  64. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  65. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  66. 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  67. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  68. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  69. 2026-07-27 13:52 UTCEG score recomputeFirst assessed: 5.4 MEDIUM

Related CVEs(same product)

Frequently asked(5)

What is CVE-2026-29086?
CVE-2026-29086 is a medium-severity vulnerability; its CVE record was published on March 4, 2026. Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, the setCookie() utility did not validate semicolons (;), carriage returns (\r), or newline characters (\n) in the domain and path options when constructing the Set-Cookie header. Because…
When was the CVE record for CVE-2026-29086 published?
The CVE record for CVE-2026-29086 was published on March 4, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-29086 actively exploited?
CVE-2026-29086 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-29086?
CVE-2026-29086 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-29086?
A fix for CVE-2026-29086 is available: update to the fixed version the vendor names in its advisory.

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