CVE-2026-59731

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (37th 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
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Astro is a web framework for content-driven websites. Version 6.4.7 performs authorization decisions on a partially decoded pathname after reaching the iterative URL decoder limit, while later rewrite route matching performs an additional decodeURI() operation and can resolve the request to a protected route. This issue is fixed in version 6.4.8.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100CISA 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
Severity82% × 45%
Exploitation40% × 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
38th
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 public PoC (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

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
githubMentions a patch (unverified)🟡 PoC Available

Astro 6.4.7 Authorization Bypass via Decode Iteration Limit and Rewrite Path Canonicalization Mismatch · Advisory · withastro/astro · GitHub

https://github.com/withastro/astro/security/advisories/GHSA-vj59-8hwv-xxmv
github_release Patch Available

[email protected]

Patch available: withastro/astro [email protected]

https://github.com/withastro/astro/releases/tag/[email protected]
github_pr

fix(core): encoded URLs

Fix merged in withastro/astro PR #17109 on 2026-06-17 — awaiting tagged release

https://github.com/withastro/astro/pull/17109
github_commit

commit 27c80ea92248 (withastro/astro)

Fix landed in withastro/astro commit 27c80ea92248 — awaiting tagged release

https://github.com/withastro/astro/commit/27c80ea92248993e5fce94b2c26d87d611ab6785

Vendor Advisories for CVE-2026-59731(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
astro—
  • 6.4.7 up to 6.4.8: fixed in 6.4.8
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 33× 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 141 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
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  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-10-01 16:11 UTCEG score recompute
  12. 2026-09-30 15:03 UTCEPSS rescore
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  15. 2026-09-28 13:22 UTCEG score recompute
  16. 2026-09-27 13:48 UTCEPSS rescore
  17. 2026-09-26 15:59 UTCEPSS rescore
  18. 2026-09-24 14:04 UTCEPSS rescore
  19. 2026-09-24 11:48 UTCEG score recompute
  20. 2026-09-23 17:54 UTCEPSS rescore
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  22. 2026-09-20 20:16 UTCEPSS rescore
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  24. 2026-09-18 05:43 UTCEG score recompute
  25. 2026-09-17 19:31 UTCEPSS rescore
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  1. 2026-09-16 14:08 UTCEPSS rescore
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  3. 2026-09-15 03:11 UTCEPSS rescore
  4. 2026-09-13 23:49 UTCEG score recompute
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-12 16:03 UTCEG score recompute
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  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 09:35 UTCEPSS rescore
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 14:03 UTCEG score recompute
  13. 2026-09-06 13:47 UTCEPSS rescore
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  15. 2026-09-04 05:07 UTCEPSS rescore
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  17. 2026-09-01 13:54 UTCEPSS rescore
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  19. 2026-08-30 20:03 UTCEG score recompute
  20. 2026-08-30 19:17 UTCEPSS rescore
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  22. 2026-08-30 01:22 UTCEPSS rescore
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  24. 2026-08-27 21:50 UTCEG score recompute
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  26. 2026-08-27 01:29 UTCEG score recompute
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  30. 2026-08-24 22:12 UTCEG score recompute
  31. 2026-08-24 09:42 UTCEG score recompute
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  34. 2026-08-22 05:13 UTCEG score recompute
  35. 2026-08-21 23:49 UTCEPSS rescore
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  37. 2026-08-20 22:55 UTCEPSS rescore
  38. 2026-08-20 01:59 UTCEG score recompute
  39. 2026-08-19 17:04 UTCEPSS rescore
  40. 2026-08-18 20:44 UTCEG score recompute
  41. 2026-08-18 13:48 UTCEPSS rescore
  42. 2026-08-17 14:42 UTCEG score recompute
  43. 2026-08-17 13:47 UTCEPSS rescore
  44. 2026-08-17 02:14 UTCEG score recompute
  45. 2026-08-16 14:56 UTCEPSS rescore
  46. 2026-08-16 13:46 UTCEG score recompute
  47. 2026-08-16 02:14 UTCEPSS rescore
  48. 2026-08-15 12:50 UTCEG score recompute
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  50. 2026-08-13 23:26 UTCEG score recompute
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  60. 2026-08-08 16:37 UTCEPSS rescore
  61. 2026-08-07 17:45 UTCEG score recompute
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  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-05 02:48 UTCEG score recompute
  67. 2026-08-04 15:10 UTCEPSS rescore
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  71. 2026-08-03 10:36 UTCEPSS rescore
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  74. 2026-08-01 11:28 UTCEG score recompute
  75. 2026-08-01 04:16 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-59731?
CVE-2026-59731 is a high vulnerability published on July 8, 2026. Astro is a web framework for content-driven websites. Version 6.4.7 performs authorization decisions on a partially decoded pathname after reaching the iterative URL decoder limit, while later rewrite route matching performs an additional decodeURI() operation and can resolve the request to a…
When was CVE-2026-59731 disclosed?
CVE-2026-59731 was first published on July 8, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59731 actively exploited?
CVE-2026-59731 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59731?
CVE-2026-59731 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59731?
A fix for CVE-2026-59731 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59731 are linked in the Vendor Advisories panel on this page.

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