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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42040

18
FAUCET Score

Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the encode() function in lib/helpers/AxiosURLSearchParams.js contains a character mapping (charMap) at line 21 that reverses the safe percent-encoding of null bytes. After encodeURIComponent('\x00') correctly produces the safe sequence %00, the charMap entry '%00': '\x00' converts it back to a raw null byte. Primary impact is limited because the standard axios request flow is not affected. This vulnerability is fixed in 1.15.1 and 0.31.1.

First published: Apr 24, 2026Last modified: Apr 27, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.31.1CPE matchmatch criteria
cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*
>= 1.0.0, < 1.15.1CPE matchmatch criteria
cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
12.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 6th percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: axiosFixed in: 1.15.1
npmpatch availablevia ghsa
Product: axiosFixed in: 0.31.1

Vendor Advisories (1)

npmGHSA-xhjh-pmcv-23jwlow

Axios: Null Byte Injection via Reverse-Encoding in AxiosURLSearchParams

May 5, 2026

References

github.com / axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw
ExploitMitigationVendor Advisory