CVE-2026-101909

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (26th 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
Trending — Patch released this weekElevated
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Axios is a promise-based HTTP client for the browser and Node.js. From 0.28.0 until 0.34.0 and 1.15.1 until 1.20.0, ToFormData processes inherited serialization options and visitor properties supplied through prototype pollution. A separate same-process prototype-pollution flaw supplies inherited dots, indexes, metaTokens, maxDepth, visitor, or Blob values before object serialization. The inherited options alter toFormData field naming and data interpretation, maxDepth can force request failure, Blob changes value handling, and a polluted visitor can execute when an attacker already has the stronger ability to inject a function. Serialized field naming and data interpretation can change, maxDepth can cause request failure, Blob can alter value handling, and a polluted visitor can execute under the stronger function-injection primitive. This issue is fixed in versions 0.34.0 and 1.20.0.

CVSS v3
8.3
EG Score
8.3HIGHmedium 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
Severity83% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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 total (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

September 28, 2026

Last Modified

October 1, 2026

Advisory Details (6)

Auto-updated Sep 28, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v1.20.0

Patch available: axios/axios v1.20.0

https://github.com/axios/axios/releases/tag/v1.20.0
github_release Patch Available

v0.34.0

Patch available: axios/axios v0.34.0

https://github.com/axios/axios/releases/tag/v0.34.0
github_commit Patch Available

commit d29be181f85f (axios/axios)

Patch available: axios/axios v0.34.0 (contains commit d29be181f85f)

https://github.com/axios/axios/commit/d29be181f85f6fe93397a07b1f69606d9622637b
github_commit Patch Available

commit d19040bda7a8 (axios/axios)

Patch available: axios/axios v1.20.0 (contains commit d19040bda7a8)

https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
github_pr Patch Available

fix: harden runtime option handling

Patch available: axios/axios v1.20.0 (PR #11141 merged 2026-08-12)

https://github.com/axios/axios/pull/11141
github Patch Available🟡 PoC Available

Prototype Pollution Gadget in axios toFormData Options · Advisory · axios/axios · GitHub

https://github.com/axios/axios/security/advisories/GHSA-x97p-jq2g-jp4f

Vendor Advisories for CVE-2026-101909(1)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgrafana13-1-main-13.1.6-0.6.hum12026-10-02redhat
redhatgrafana12-4-main-12.4.12-0.3.hum12026-10-02redhat
redhatgrafana13-2-main-13.2.1-0.9.hum12026-10-02redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
axios—0.34.0—

Weakness Classification(1)

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

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 19× in last 7d / 19× 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. 2026-10-04 08:47 UTCVendor advisory
  2. 2026-10-03 21:55 UTCEG score recompute
  3. 2026-10-03 21:55 UTCVendor advisory
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 10:57 UTCVendor advisory
  6. 2026-10-03 00:06 UTCEG score recompute
  7. 2026-10-03 00:06 UTCVendor advisory
  8. 2026-10-02 02:22 UTCEG score recompute
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-10-01 15:23 UTCEG score recompute
  11. 2026-10-01 14:51 UTCEG score recompute
  12. 2026-09-30 19:44 UTCEG score recompute
  13. 2026-09-30 15:02 UTCEPSS rescore
  14. 2026-09-29 16:02 UTCEG score recompute
  15. 2026-09-29 15:20 UTCEPSS rescore
  16. 2026-09-29 05:11 UTCEG score recompute
  17. 2026-09-28 18:20 UTCEG score recompute
  18. 2026-09-28 17:47 UTCEG score recompute
  19. 2026-09-28 17:46 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-101909?
CVE-2026-101909 is a high vulnerability published on September 28, 2026. Axios is a promise-based HTTP client for the browser and Node.js. From 0.28.0 until 0.34.0 and 1.15.1 until 1.20.0, ToFormData processes inherited serialization options and visitor properties supplied through prototype pollution. A separate same-process prototype-pollution flaw supplies inherited…
When was CVE-2026-101909 disclosed?
CVE-2026-101909 was first published on September 28, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101909 actively exploited?
CVE-2026-101909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101909?
CVE-2026-101909 has a CVSS base score of 8.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101909?
A fix for CVE-2026-101909 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-101909 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-101909

Explore →

Is Your Infrastructure Affected by CVE-2026-101909?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs