How severe is CVE-2026-42040?

CVE-2026-42040 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-42040 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42040?

CVE-2026-42040 affects Axios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42040?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42040 have an EU (EUVD) identifier?

Yes. CVE-2026-42040 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25590.

When was CVE-2026-42040 published?

CVE-2026-42040 was published on 2026-04-24 and last updated on 2026-06-17.

CVE-2026-42040

CVE-2026-42040 is a low-severity vulnerability in Axios with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-116.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25590
Weakness: CWE-116
Affected product: Axios
Published: 2026-04-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-42040?: 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.
How severe is CVE-2026-42040?: CVE-2026-42040 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-42040 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42040?: CVE-2026-42040 affects Axios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42040?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42040 have an EU (EUVD) identifier?: Yes. CVE-2026-42040 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25590.
When was CVE-2026-42040 published?: CVE-2026-42040 was published on 2026-04-24 and last updated on 2026-06-17.

References

https://github.com/axios/axios/security/advisories/GHSA-xhjh-pmcv-23jw

Affected products (1)

cpe:2.3:a:axios:axios:*:*:*:*:*:node.js:*:*

More vulnerabilities in Axios

CVE-2025-62718 — Critical (CVSS 9.9): Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.0 and 0.31.0, Axios does not correctly…
CVE-2026-44494 — High (CVSS 8.7): Axios is a promise based HTTP client for the browser and Node.js. From 1.0.0 to before 1.16.0, the Axios library is…
CVE-2026-44492 — High (CVSS 8.6): Axios is a promise based HTTP client for the browser and Node.js. Prior to 0.32.0 and 1.16.0, Axios does not normalise…
CVE-2026-44496 — High (CVSS 7.5): Axios is a promise based HTTP client for the browser and Node.js. Axios versions before 0.32.0 on the 0.x line and…
CVE-2026-44488 — High (CVSS 7.5): Axios is a promise based HTTP client for the browser and Node.js. Axios versions 1.7.0 through 1.15.x did not enforce…
CVE-2026-44487 — High (CVSS 7.5): Axios is a promise based HTTP client for the browser and Node.js. Prior to 0.32.0 and 1.16.0, Axios’s Node.js HTTP…

All CVEs affecting Axios →

Other CWE-116 vulnerabilities

CVE-2025-55730 — Critical (CVSS 10.0): XWiki Remote Macros provides XWiki rendering macros that are useful when migrating content from Confluence. Starting in…
CVE-2025-55729 — Critical (CVSS 10.0): XWiki Remote Macros provides XWiki rendering macros that are useful when migrating content from Confluence. Starting in…
CVE-2023-47143 — Critical (CVSS 10.0): IBM Tivoli Application Dependency Discovery Manager 7.3.0.0 through 7.3.0.10 is vulnerable to HTTP header injection,…
CVE-2023-26472 — Critical (CVSS 9.9): XWiki Platform is a generic wiki platform. Starting in version 6.2-milestone-1, one can execute any wiki content with…
CVE-2022-41934 — Critical (CVSS 9.9): XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Any user with…
CVE-2022-36100 — Critical (CVSS 9.9): XWiki Platform Applications Tag and XWiki Platform Tag UI are tag applications for XWiki, a generic wiki platform.…

Browse all CWE-116 vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

157.66.35.106 (ipv4-addr)