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Fencer Vulns
high 8.2

CVE-2026-101903 json

Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)

published 2026-09-28 41 d ago modified 2026-09-30 39 d ago also EUVD-2026-88378 , GHSA-c29m-xwm3-cm6r

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm axios 1.20.0
  • axios axios 1.20.0
  • node-axios Debian 14 1.20.0-1

debian advisories DEBIAN-CVE-2026-101903

  • grafana12.4 hummingbird 1 12.4.12-0.3.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.9.hum1
  • grafana13.1 hummingbird 1 13.1.6-0.6.hum1

red hat advisories RHSA-2026:74871RHSA-2026:74872RHSA-2026:74869

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-101903 updated cvss 7.5

axios: Axios: Denial of Service via malformed data URLs

  • Red Hat Hardened Images grafana13.1 13.1.6-0.6.hum1, grafana13.2 13.2.1-0.9.hum1, grafana12.4 12.4.12-0.3.hum1
    fixed: vendor fix RHSA-2026:74871
  • Red Hat Hardened Images jaeger 2.20.0-0.11.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
41 d ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/axios/axios/security/advisories/GHSA-c29m-xwm3-cm6r referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CNA 4.0 8.2 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

Affected packages

ecosystem package affected fixed in
npm axios
>=1.16.1, <1.20.0
1.20.0

Affected products

  • axios axios

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.