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Axios CVE-2026-101903

| EUVDEUVD-2026-88378 HIGH
Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)
2026-09-28 GitHub_M GHSA-c29m-xwm3-cm6r
Denial Of Service Node.js Axios JavaScript npm
8.2
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.2 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.9 MEDIUM

Network-reachable and unauthenticated, but AC:H because the app must route attacker-controlled data: URIs to fromDataURI; availability-only impact so C:N/I:N/A:H.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

6
POC Analysis Generated
Sep 28, 2026 - 19:23 vuln.today
Patch available
Sep 28, 2026 - 19:01 EUVD
Metadata Corrected
Sep 28, 2026 - 18:40 vuln.today
tag: JavaScript added
Metadata Corrected
Sep 28, 2026 - 18:40 vuln.today
tag: npm added
Analysis Generated
Sep 28, 2026 - 18:02 vuln.today
CVE Published
Sep 28, 2026 - 17:25 cve.org
HIGH 8.2

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 643 npm packages depend on axios (238 direct, 409 indirect)

Ecosystem-wide dependent count for version 1.16.1.

DescriptionCVE.org

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.

Articles & Coverage 1

News 15 New Node.js Vulnerabilities - 2 Critical, 13 High Severity Sep 29, 2026

AnalysisAI

Axios 1.16.1 through 1.19.x can be driven into catastrophic regular-expression backtracking through its data-URI parser, letting an unauthenticated remote attacker stall the Node.js event loop and cause a denial of service. The trigger is an attacker-controlled, malformed RFC 2397 data URL containing many slash characters on both sides of the media-type separator and no comma, which the fromDataURI / DATA_URL_PATTERN logic must exhaustively re-split before rejecting; because the parse is synchronous, the whole single-threaded process is blocked. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the affected application accept attacker-controlled URLs and permit the data: scheme, routing them into Axios's fromDataURI / DATA_URL_PATTERN parsing path - this is not the standard remote-HTTP request flow, so applications that never process data URIs via Axios are not exposed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a CWE-1333 ReDoS (regular-expression denial of service) in the Axios data-URI parser, affecting versions 1.16.1 through 1.19.x and fixed in 1.20.0. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: 1.20.0 - upgrade the axios dependency to 1.20.0 or later (npm install axios@^1.20.0), which rejects media types containing extra slash separators and removes the excessive backtracking; the change is carried by pull request 11141 and commit d19040bda7a8be2f82c3c6e1a5bc03917daee39a, with the release notes at https://github.com/axios/axios/releases/tag/v1.20.0 and the advisory at https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, determine exposure by inventorying all applications and services that depend on Axios in the 1.16.1 through 1.19.x range, and prioritise any that route untrusted inbound data into Axios's data: URI parsing path (fromDataURI / DATA_URL_PATTERN); where such routing exists, disable or bypass data-URI parsing for untrusted input immediately, enforce strict request body and URL length limits at the edge, and place a restart-on-hang watchdog plus event-loop-lag alerting on the affected Node.js processes so any stall is detected and recovered from in seconds rather than discovered by customers. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected
SUSE Linux Enterprise Micro 5.4 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected

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CVE-2026-101903 vulnerability details – vuln.today
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