CVE-2026-102989

CRITICALPre-NVD 9.39.3
EchelonGraph scoreHIGH confidence

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

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-15. A secondary CVSS source baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-98849 (ENISA EUVD) · GHSA-qx66-fv34-fjm8 (GitHub Security Advisories)Source: ENISA EUVD

9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

TanStack Router is a client-first, server-capable, fully type-safe router and full-stack framework for the web. From 1.143.12 until 1.169.39 for @tanstack/start-server-core, 1.168.60 for @tanstack/react-start, 1.168.57 for @tanstack/solid-start, and 1.168.56 for @tanstack/vue-start, an unauthenticated attacker can place non-public fields in a server-function request payload so that attacker-controlled middleware state reaches the error path and a response-shaped object is accepted as an HTTP response. A crafted server-function URL can therefore return attacker-controlled HTML from the application's origin; when a visitor opens the URL, the injected script can access same-origin data and issue requests with the visitor's authority. This issue is fixed in @tanstack/start-server-core 1.169.39, @tanstack/react-start 1.168.60, @tanstack/solid-start 1.168.57, and @tanstack/vue-start 1.168.56.

CVSS v3
9.3
EG Score
9.3CRITICALhigh confidence
EG Risk
42
EG Risk 42/100

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)
Severity93% × 45%
Impact severity (EG Severity): CVSS 9.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.5%
EPSS %ILE
45th
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 (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.

EG Severity
9.3 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

October 13, 2026

Last Modified

October 16, 2026

Advisory Details (4)

Auto-updated Oct 13, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
GitHub release Patch Available

Release 2026-09-30 17:47

Patch available: TanStack/router release-2026-09-30-1747

https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747
GitHub commit Patch Available

commit d521abd71c69 (TanStack/router)

Patch available: TanStack/router @tanstack/solid-router@1.170.40 (contains commit d521abd71c69)

https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb
GitHub pull request Patch Available

fix(start): align server function transport behavior

Patch available: TanStack/router @tanstack/solid-router@1.170.40 (PR #8573 merged 2026-09-30)

https://github.com/TanStack/router/pull/8573
GitHub advisoryMentions a patch (unverified)

Unauthenticated reflected XSS in TanStack Start server-function responses · Advisory · TanStack/router · GitHub

https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8

Vendor Advisories for CVE-2026-102989(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npm@tanstack/react-start @ 1.168.60 (fixes >= 1.143.12, < 1.168.60)—ghsa
npm@tanstack/solid-start @ 1.168.57 (fixes >= 1.143.12, < 1.168.57)—ghsa
npm@tanstack/start-server-core @ 1.169.39 (fixes >= 1.143.12, < 1.169.39)—ghsa
npm@tanstack/vue-start @ 1.168.56 (fixes >= 1.143.12, < 1.168.56)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 1 ecosystem)
npm(4)
PackageVulnerable rangeFix by version rangeDependents
@tanstack/react-start—
  • 1.143.12 up to 1.168.60: fixed in 1.168.60
—
@tanstack/solid-start—
  • 1.143.12 up to 1.168.57: fixed in 1.168.57
—
@tanstack/start-server-core—
  • 1.143.12 up to 1.169.39: fixed in 1.169.39
—
@tanstack/vue-start—
  • 1.143.12 up to 1.168.56: fixed in 1.168.56
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 45× 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.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-11-01 16:00 UTCGHSA enrichmentGHSA-qx66-fv34-fjm8 · GitHub severity CRITICAL · GitHub CVSS 9.3
  3. 2026-11-01 08:00 UTCGHSA enrichmentGHSA-qx66-fv34-fjm8 · GitHub severity CRITICAL · GitHub CVSS 9.3
  4. 2026-11-01 08:00 UTCEG score recompute
  5. 2026-10-31 17:50 UTCEG score recompute
  6. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  7. 2026-10-30 19:42 UTCEG score recompute
  8. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  9. 2026-10-29 21:30 UTCEG score recompute
  10. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  11. 2026-10-28 23:21 UTCEG score recompute
  12. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  13. 2026-10-28 01:10 UTCEG score recompute
  14. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  15. 2026-10-27 02:57 UTCEG score recompute
  16. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  17. 2026-10-26 00:45 UTCEG score recompute
  18. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  19. 2026-10-25 14:56 UTCEG score recompute
  20. 2026-10-25 02:32 UTCEG score recompute
  21. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-24 04:23 UTCEG score recompute
  23. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-23 06:13 UTCEG score recompute
  25. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 20 more
  1. 2026-10-22 08:02 UTCEG score recompute
  2. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-21 09:50 UTCEG score recompute
  4. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-20 11:41 UTCEG score recompute
  6. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-19 13:17 UTCEG score recompute
  8. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-18 05:10 UTCEG score recompute
  10. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-17 14:19 UTCEG score recompute
  12. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-16 00:17 UTCEG score recompute
  14. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-14 16:31 UTCEG score recompute
  17. 2026-10-14 15:27 UTCEG score recompute
  18. 2026-10-13 17:26 UTCEG score recompute
  19. 2026-10-13 16:23 UTCEG score recomputeFirst assessed: 9.3 CRITICAL
  20. 2026-10-13 16:19 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Same product

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npm:@tanstack/react-start

Frequently asked(5)

What is CVE-2026-102989?
CVE-2026-102989 is a critical-severity vulnerability; its CVE record was published on October 13, 2026. TanStack Router is a client-first, server-capable, fully type-safe router and full-stack framework for the web. From 1.143.12 until 1.169.39 for @tanstack/start-server-core, 1.168.60 for @tanstack/react-start, 1.168.57 for @tanstack/solid-start, and 1.168.56 for @tanstack/vue-start, an…
When was the CVE record for CVE-2026-102989 published?
The CVE record for CVE-2026-102989 was published on October 13, 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 October 16, 2026; the record at its source may have been updated since.
Is CVE-2026-102989 actively exploited?
CVE-2026-102989 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102989?
CVE-2026-102989 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102989?
A fix for CVE-2026-102989 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102989 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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