Axios is a promise-based HTTP client for the browser and Node.js. From 1.16.1 until 1.20.0, the RFC 2397 regular expression allows slash characters on both sides of the media-type separator. An application passes an attacker-controlled malformed data URL containing many slash characters and no comma. the JavaScript regular-expression engine explores many separator placements before rejecting the URL. Synchronous excessive backtracking can block the Node.js event loop and cause denial of service. The affected identifiers are fromDataURI, DATA_URL_PATTERN, data:. This issue is fixed in version 1.20.0.
CVE-2026-101903
HIGHPre-NVD 8.28.2—Trending — Patch released this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 8.2
- EG Score
- 8.2HIGHmedium confidence
- EG Risk
- 42EG Risk 42/100CISA 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 computedSeverity82% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or 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
- 0.4%
- EPSS %ILE
- 29th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or 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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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
ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS) · Advisory · axios/axios · GitHub
https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6rVendor Advisories for CVE-2026-101903(4)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:74872Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:74871Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:74869Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- GHSA-c29m-xwm3-cm6rGitHub Security AdvisoriesHigh
Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)
Patch Availability(3)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | grafana13-1-main-13.1.6-0.6.hum1 | 2026-10-02 | redhat |
| 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 |
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(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 16× in last 7d / 16× 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.
- 2026-10-04 06:09 UTCVendor advisory
- 2026-10-03 18:23 UTCEG score recompute
- 2026-10-03 18:23 UTCVendor advisory
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-03 06:34 UTCVendor advisory
- 2026-10-02 18:47 UTCEG score recompute
- 2026-10-02 07:01 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescore
- 2026-09-30 17:40 UTCEG score recompute
- 2026-09-30 15:02 UTCEPSS rescore
- 2026-09-29 18:05 UTCEG score recompute
- 2026-09-29 15:20 UTCEPSS rescore
- 2026-09-29 06:05 UTCEG score recompute
- 2026-09-28 18:20 UTCEG score recompute
- 2026-09-28 17:40 UTCEG score recompute
- 2026-09-28 17:36 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownnpm:axios
Same vendor
10 shownredhat:RHSA-2026:74869
Frequently asked(5)
What is CVE-2026-101903?
CVE-2026-101903 is a high vulnerability published on September 28, 2026. Axios is a promise-based HTTP client for the browser and Node.js. From 1.16.1 until 1.20.0, the RFC 2397 regular expression allows slash characters on both sides of the media-type separator. An application passes an attacker-controlled malformed data URL containing many slash characters and no…
When was CVE-2026-101903 disclosed?
CVE-2026-101903 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-2026-101903 actively exploited?
CVE-2026-101903 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101903?
CVE-2026-101903 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-2026-101903?
A fix for CVE-2026-101903 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-101903 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-2026-101903
Is Your Infrastructure Affected by CVE-2026-101903?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.