Axios is a promise-based HTTP client for the browser and Node.js. From 1.12.0 until 1.20.0, ResolveConfig reads inherited Symbol.toStringTag, append, and getHeaders properties while resolving FormData headers. A separate same-process prototype-pollution flaw supplies an array or non-plain class instance whose inherited properties make it appear FormData-like; plain objects are blocked. The inherited getHeaders function can return attacker-controlled headers that resolveConfig merges into a fetch adapter request. Attacker-controlled headers can alter authorization, cache, metadata-service, or application-specific request behavior. This issue is fixed in version 1.20.0.
CVE-2026-101900
MEDIUMPre-NVD 6.96.9—Trending — Patch released this weekElevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.9 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
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.9Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 6.9
- EG Score
- 6.9MEDIUMmedium confidence
- EG Risk
- 47EG Risk 47/100CISA 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 computedSeverity69% × 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
- 43rd
- 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
September 28, 2026
Last Modified
September 30, 2026
Advisory Details (4)
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/v1.20.0github_commit Patch Available
commit d19040bda7a8 (axios/axios)
Patch available: axios/axios v1.20.0 (contains commit d19040bda7a8)
https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39agithub_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/11141github Patch Available🟡 PoC Available
Fetch Adapter Header Injection via Inherited FormData getHeaders · Advisory · axios/axios · GitHub
https://github.com/axios/axios/security/advisories/GHSA-4hqw-qxg8-jxx2Vendor Advisories for CVE-2026-101900(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 / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | grafana12-4-main-12.4.12-0.3.hum1 | 2026-10-02 | redhat |
| redhat | grafana13-2-main-13.2.1-0.9.hum1 | 2026-10-02 | redhat |
| redhat | grafana13-1-main-13.1.6-0.6.hum1 | 2026-10-02 | redhat |
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)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| axios | — | 1.20.0 | — |
Weakness Classification(3)
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 13× in last 7d / 13× 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.
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-03 14:18 UTCEG score recompute
- 2026-10-03 14:18 UTCVendor advisory
- 2026-10-02 16:07 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescore
- 2026-09-30 19:44 UTCEG score recompute
- 2026-09-30 15:02 UTCEPSS rescore
- 2026-09-29 16:46 UTCEG score recompute
- 2026-09-29 15:20 UTCEPSS rescore
- 2026-09-28 18:20 UTCEG score recompute
- 2026-09-28 17:56 UTCEG score recompute
- 2026-09-28 17:27 UTCEG score recompute
- 2026-09-28 17:26 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownnpm:axios
Same vendor
10 shownredhat:RHSA-2026:74869
Same CWE
10 shownCWE-1321 · CWE-74
Frequently asked(5)
What is CVE-2026-101900?
CVE-2026-101900 is a medium vulnerability published on September 28, 2026. Axios is a promise-based HTTP client for the browser and Node.js. From 1.12.0 until 1.20.0, ResolveConfig reads inherited Symbol.toStringTag, append, and getHeaders properties while resolving FormData headers. A separate same-process prototype-pollution flaw supplies an array or non-plain class…
When was CVE-2026-101900 disclosed?
CVE-2026-101900 was first published on September 28, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101900 actively exploited?
CVE-2026-101900 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101900?
CVE-2026-101900 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101900?
A fix for CVE-2026-101900 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-101900 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-2026-101900
Is Your Infrastructure Affected by CVE-2026-101900?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.