CVE-2026-71848

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st percentile of EPSS-scored CVEs). 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, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.0 to 4.12.33, the languageDetector middleware is vulnerable to algorithmic complexity denial of service when processing a crafted language tag containing a large number of hyphen separated subtags. To implement progressive language tag truncation, normalizeLanguage() repeatedly calls parts.slice(0, i).join('-') for every possible prefix, so the total amount of string processing grows quadratically with the number of subtags. Language values may come from a query parameter, cookie, Accept-Language header, or URL path, depending on the detector configuration, and the default detector order enables query string, cookie, and header detection, so applications using languageDetector() may expose this processing to unauthenticated requests. An attacker may repeatedly send requests containing long, hyphen separated language tags, causing excessive CPU consumption and preventing unrelated requests from being processed. This issue is fixed in version 4.12.34.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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

August 7, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 7, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v4.12.34

Patch available: honojs/hono v4.12.34

https://github.com/honojs/hono/releases/tag/v4.12.34
github_commit Patch Available

commit f70e2c316843 (honojs/hono)

Patch available: honojs/hono v4.12.34 (contains commit f70e2c316843)

https://github.com/honojs/hono/commit/f70e2c31684387b3231cc38512a31df6ca76a1c7
github Patch Available

Algorithmic Complexity DoS in Language Middleware · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-54fx-42gc-7vw4

Vendor Advisories for CVE-2026-71848(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—
  • 4.12.0 up to 4.12.34: fixed in 4.12.34
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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.

  1. 2026-10-05 08:13 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-04 05:43 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 09:32 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 22:55 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 05:45 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 17:08 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 04:21 UTCEG score recompute
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  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 01:55 UTCEG score recompute
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  19. 2026-09-21 21:09 UTCEPSS rescore
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  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-19 20:11 UTCEG score recompute
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  24. 2026-09-18 17:33 UTCEG score recompute
  25. 2026-09-17 15:10 UTCEG score recompute
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  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 11:08 UTCEG score recompute
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-15 06:34 UTCEG score recompute
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 04:46 UTCEG score recompute
  7. 2026-09-13 03:33 UTCEG score recompute
  8. 2026-09-12 15:02 UTCEPSS rescore
  9. 2026-09-12 02:19 UTCEG score recompute
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 01:03 UTCEG score recompute
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-09 06:00 UTCEG score recompute
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-07 17:43 UTCEG score recompute
  16. 2026-09-06 13:48 UTCEPSS rescore
  17. 2026-09-06 11:43 UTCEG score recompute
  18. 2026-09-05 10:31 UTCEG score recompute
  19. 2026-09-04 09:02 UTCEG score recompute
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-03 05:59 UTCEG score recompute
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 23:40 UTCEG score recompute
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-08-31 22:27 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescore
  28. 2026-08-30 11:40 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 10:22 UTCEG score recompute
  31. 2026-08-28 21:42 UTCEPSS rescore
  32. 2026-08-28 04:40 UTCEG score recompute
  33. 2026-08-27 03:25 UTCEG score recompute
  34. 2026-08-26 14:47 UTCEPSS rescore
  35. 2026-08-26 02:06 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescore
  37. 2026-08-25 00:53 UTCEG score recompute
  38. 2026-08-23 23:39 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 22:26 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 21:13 UTCEG score recompute
  43. 2026-08-20 22:56 UTCEPSS rescore
  44. 2026-08-19 18:47 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-18 17:25 UTCEG score recompute
  47. 2026-08-18 13:49 UTCEPSS rescore
  48. 2026-08-18 13:49 UTCEPSS rescore
  49. 2026-08-17 15:22 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 14:09 UTCEG score recompute
  54. 2026-08-16 02:15 UTCEPSS rescore
  55. 2026-08-15 12:56 UTCEG score recompute
  56. 2026-08-15 01:31 UTCEPSS rescore
  57. 2026-08-14 11:43 UTCEG score recompute
  58. 2026-08-13 22:00 UTCEPSS rescore
  59. 2026-08-13 10:30 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescore
  61. 2026-08-12 09:17 UTCEG score recompute
  62. 2026-08-11 08:03 UTCEG score recompute
  63. 2026-08-11 00:00 UTCEPSS rescore
  64. 2026-08-10 06:50 UTCEG score recompute
  65. 2026-08-09 13:47 UTCEPSS rescore
  66. 2026-08-09 05:37 UTCEG score recompute
  67. 2026-08-08 16:37 UTCEPSS rescore
  68. 2026-08-08 04:24 UTCEG score recompute
  69. 2026-08-08 03:27 UTCEG score recompute
  70. 2026-08-07 19:28 UTCEG score recompute
  71. 2026-08-07 18:47 UTCEG score recompute
  72. 2026-08-07 18:47 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-71848?
CVE-2026-71848 is a medium vulnerability published on August 7, 2026. Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.0 to 4.12.33, the languageDetector middleware is vulnerable to algorithmic complexity denial of service when processing a crafted language tag containing a large number of hyphen separated subtags. To…
When was CVE-2026-71848 disclosed?
CVE-2026-71848 was first published on August 7, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71848 actively exploited?
CVE-2026-71848 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71848?
CVE-2026-71848 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71848?
A fix for CVE-2026-71848 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71848 are linked in the Vendor Advisories panel on this page.

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