How severe is CVE-2026-39865?

CVE-2026-39865 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-39865 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39865?

CVE-2026-39865 affects Axios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39865?

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

Does CVE-2026-39865 have an EU (EUVD) identifier?

Yes. CVE-2026-39865 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20501.

When was CVE-2026-39865 published?

CVE-2026-39865 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39865

CVE-2026-39865 is a medium-severity vulnerability in Axios with a CVSS 3.x base score of 5.9. 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-400.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20501
Weakness: CWE-400
Affected product: Axios
Published: 2026-04-08
Last modified: 2026-06-17

Description

Axios is a promise based HTTP client for the browser and Node.js. Starting in version 1.13.0 and prior to 1.13.2, Axios HTTP/2 session cleanup logic contains a state corruption bug that allows a malicious server to crash the client process through concurrent session closures. The vulnerability exists in the Http2Sessions.getSession() method in lib/adapters/http.js. The session cleanup logic contains a control flow error when removing sessions from the sessions array. This vulnerability is fixed in 1.13.2.

Frequently asked questions

What is CVE-2026-39865?: Axios is a promise based HTTP client for the browser and Node.js. Starting in version 1.13.0 and prior to 1.13.2, Axios HTTP/2 session cleanup logic contains a state corruption bug that allows a malicious server to crash the client process through concurrent session closures. The vulnerability exists in the Http2Sessions.getSession() method in lib/adapters/http.js. The session cleanup logic contains a control flow error when removing sessions from the sessions array. This vulnerability is fixed in 1.13.2.
How severe is CVE-2026-39865?: CVE-2026-39865 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-39865 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39865?: CVE-2026-39865 affects Axios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39865?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39865 have an EU (EUVD) identifier?: Yes. CVE-2026-39865 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20501.
When was CVE-2026-39865 published?: CVE-2026-39865 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (1)

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

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Threat intelligence

Threat-intel indicators referencing this CVE:

157.66.35.106 (ipv4-addr)