CVE-2026-21710 · cross-distro fix matrix

CVE-2026-21710: A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `proto` and the application accesses `req.headersDistinct`. When this occurs, `dest["proto"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to

Affects 4 Linux releases across 4 (distro × package) combinations.

Elevated exploitation risk

FIRST EPSS puts CVE-2026-21710's probability of exploitation in the next 30 days at 13% (96th percentile of all CVEs)— well above the noise floor. Prioritize it.

EPSS:13% · 30-day exploit probability96th percentile

Fix per ecosystem

Each block below is a distro release where CVE-2026-21710 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

nodejs→ fixed in18.20.4+dfsg-1~deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nodejs
```

Debian trixie

Source: Debian Security Tracker

nodejs→ fixed in20.19.2+dfsg-1+deb13u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nodejs
```

Alpine v3.21

Source: Alpine secdb

nodejs→ fixed in22.22.2-r0
```
apk update && apk add --upgrade nodejs
```

Alpine edge

Source: Alpine secdb

nodejs→ fixed in24.14.1-r0
```
apk update && apk add --upgrade nodejs
```

Are YOU affected by CVE-2026-21710?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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