CVE-2026-73422

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% (43rd 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
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: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/server/transition.ts; renderTransition passes sheet.toString() into markHTMLString(), while addAnimationProperty serializes duration through toTimeValue() and also handles easing, direction, delay, fillMode, and name. Exploitation requires an on-demand or server-rendered route to pass attacker-controlled data into a View Transition animation definition and can execute arbitrary JavaScript in the affected application's origin, allowing access to sensitive page data and authenticated actions available to the victim. This issue is fixed in version 7.1.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA 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%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

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

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

Exploitation public PoC (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

August 12, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 12, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

[email protected]

Patch available: withastro/astro [email protected]

https://github.com/withastro/astro/releases/tag/[email protected]
github_commit Patch Available

commit 092da560eea7 (withastro/astro)

Patch available: withastro/astro [email protected] (contains commit 092da560eea7)

https://github.com/withastro/astro/commit/092da560eea77ee63a3e2c583c80d8238544e42b
github_pr Patch Available

Add more escaping for rendered content

Patch available: withastro/astro [email protected] (PR #17393 merged 2026-07-15)

https://github.com/withastro/astro/pull/17393
githubMentions a patch (unverified)🟡 PoC Available

Reflected XSS via unescaped View Transition animation properties · Advisory · withastro/astro · GitHub

https://github.com/withastro/astro/security/advisories/GHSA-4g3v-8h47-v7g6

Vendor Advisories for CVE-2026-73422(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—
  • 2.9.0 up to 7.1.0: fixed in 7.1.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 43× 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. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-06 14:08 UTCEG score recompute
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-03 19:55 UTCEG score recompute
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 08:17 UTCEG score recompute
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-09-30 21:53 UTCEG score recompute
  13. 2026-09-29 15:24 UTCEPSS rescore
  14. 2026-09-29 08:26 UTCEG score recompute
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-28 09:09 UTCEG score recompute
  17. 2026-09-27 13:48 UTCEPSS rescore
  18. 2026-09-27 09:52 UTCEG score recompute
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-25 03:39 UTCEG score recompute
  21. 2026-09-23 20:53 UTCEG score recompute
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-22 21:08 UTCEG score recompute
  24. 2026-09-21 21:51 UTCEG score recompute
  25. 2026-09-21 21:09 UTCEPSS rescore
Show 74 more
  1. 2026-09-20 22:30 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-19 23:11 UTCEG score recompute
  4. 2026-09-18 23:51 UTCEG score recompute
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 00:31 UTCEG score recompute
  7. 2026-09-17 00:16 UTCEG score recompute
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 21:57 UTCEG score recompute
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-13 19:03 UTCEG score recompute
  13. 2026-09-12 19:39 UTCEG score recompute
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-11 20:21 UTCEG score recompute
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-10 20:45 UTCEG score recompute
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-09 05:52 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 06:35 UTCEG score recompute
  22. 2026-09-07 05:49 UTCEG score recompute
  23. 2026-09-06 13:48 UTCEPSS rescore
  24. 2026-09-06 06:31 UTCEG score recompute
  25. 2026-09-05 07:13 UTCEG score recompute
  26. 2026-09-04 07:53 UTCEG score recompute
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-03 05:55 UTCEG score recompute
  29. 2026-09-02 14:12 UTCEPSS rescore
  30. 2026-09-02 06:18 UTCEG score recompute
  31. 2026-09-01 13:54 UTCEPSS rescore
  32. 2026-09-01 06:55 UTCEG score recompute
  33. 2026-09-01 04:40 UTCEPSS rescore
  34. 2026-09-01 04:40 UTCEPSS rescore
  35. 2026-08-31 07:32 UTCEG score recompute
  36. 2026-08-30 19:18 UTCEPSS rescore
  37. 2026-08-30 19:17 UTCEPSS rescore
  38. 2026-08-30 07:55 UTCEG score recompute
  39. 2026-08-30 01:22 UTCEPSS rescore
  40. 2026-08-29 08:31 UTCEG score recompute
  41. 2026-08-28 21:42 UTCEPSS rescore
  42. 2026-08-27 16:29 UTCEG score recompute
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-26 16:27 UTCEG score recompute
  45. 2026-08-26 14:47 UTCEPSS rescore
  46. 2026-08-25 16:37 UTCEG score recompute
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-24 17:16 UTCEG score recompute
  49. 2026-08-23 17:00 UTCEG score recompute
  50. 2026-08-23 00:19 UTCEPSS rescore
  51. 2026-08-22 17:43 UTCEG score recompute
  52. 2026-08-21 23:49 UTCEPSS rescore
  53. 2026-08-21 18:24 UTCEG score recompute
  54. 2026-08-20 22:56 UTCEPSS rescore
  55. 2026-08-19 19:46 UTCEG score recompute
  56. 2026-08-19 17:04 UTCEPSS rescore
  57. 2026-08-18 20:28 UTCEG score recompute
  58. 2026-08-18 13:49 UTCEPSS rescore
  59. 2026-08-18 13:49 UTCEPSS rescore
  60. 2026-08-17 21:11 UTCEG score recompute
  61. 2026-08-17 13:47 UTCEPSS rescore
  62. 2026-08-16 21:54 UTCEG score recompute
  63. 2026-08-16 14:56 UTCEPSS rescore
  64. 2026-08-16 14:56 UTCEPSS rescore
  65. 2026-08-16 02:15 UTCEPSS rescore
  66. 2026-08-15 22:37 UTCEG score recompute
  67. 2026-08-15 01:31 UTCEPSS rescore
  68. 2026-08-14 23:19 UTCEG score recompute
  69. 2026-08-14 22:24 UTCEG score recompute
  70. 2026-08-14 19:56 UTCEG score recompute
  71. 2026-08-13 22:00 UTCEPSS rescore
  72. 2026-08-12 21:20 UTCEG score recompute
  73. 2026-08-12 20:41 UTCEG score recompute
  74. 2026-08-12 20:40 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-73422?
CVE-2026-73422 is a medium vulnerability published on August 12, 2026. Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such…
When was CVE-2026-73422 disclosed?
CVE-2026-73422 was first published on August 12, 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-2026-73422 actively exploited?
CVE-2026-73422 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73422?
CVE-2026-73422 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-2026-73422?
A fix for CVE-2026-73422 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73422 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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