# CVE-2026-101901: Axios: Denial of Service via Unhandled 'error' Event in HTTP/2 ClientHttp2Session Initialization

> An attacker can cause a Node.js process crash via unhandled errors in Axios HTTP/2 sessions, requiring HTTP/2 usage.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Sep 2026
- **Updated:** 1 Oct 2026
- **Also known as:** CLEANSTART-2026-FG90857, CLEANSTART-2026-HY63925, CLEANSTART-2026-TE72619, DEBIAN-CVE-2026-101901, ECHO-ee9d-b763-761c, GHSA-542g-h47m-68v8, MINI-3hrq-5v86-2pqj, MINI-692r-gwqr-vjg7, MINI-763g-8jjx-wmrj, MINI-cf64-9698-fxhw, MINI-f3gf-6vmr-mr84, MINI-f6p6-x7j8-63fj, MINI-h7gf-2x6v-7q75, MINI-hv5g-7pr2-rv62, MINI-jjxm-v427-46gr, MINI-qr24-8c9j-v553, MINI-rfhx-mqfg-jfrp, MINI-x5qf-rhqh-34w3, ROOT-APP-NPM-CVE-2026-101901, UBUNTU-CVE-2026-101901

## What is CVE-2026-101901?

CVE-2026-101901 is a high-severity denial of service vulnerability in axios, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Axios is a promise-based HTTP client for the browser and Node.js. From 1.13.0 until 1.20.0, Http2Sessions does not install adequate error handling for a ClientHttp2Session during Axios HTTP/2 session initialization or reuse. A request uses httpVersion: 2 and the ClientHttp2Session emits an error during session initialization or reuse. The unhandled session error escapes normal Promise rejection handling. The uncaught error can terminate the Node.js process and cause denial of service. This issue is fixed in version 1.20.0.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-101901?

2 open source packages ship an affected version, including axios.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `axios` | npm | From 1.13.0 | 1.20.0 |
| `axios` | npm | From 1.13.0 | 1.20.0 |

## How do I fix CVE-2026-101901?

Upgrade axios to 1.20.0 or later.

## Is CVE-2026-101901 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101901 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101901 and fix it if it is affected.

What it is: CVE-2026-101901 is a high-severity denial of service vulnerability in axios, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101901 exists.

Affected packages and fixed versions:
- axios (npm): affected from 1.13.0; fixed in 1.20.0
- axios (npm): affected from 1.13.0; fixed in 1.20.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-101901/ (Markdown: https://insights.sbomify.com/CVE-2026-101901/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101901
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101901
- OSV: https://osv.dev/vulnerability/CVE-2026-101901

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101901/
Summaries are generated and may contain mistakes; the official description above is the record.