How severe is CVE-2026-35213?

No CVSS score has been assigned to CVE-2026-35213 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-35213?

CVE-2026-35213 affects the following packages: @hapi/content (npm). Ecosystems affected: npm.

How do I fix CVE-2026-35213?

Update @hapi/content to 6.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-35213 is resolved across your whole dependency graph.

How do I detect CVE-2026-35213 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @hapi/content, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-35213 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2026-35213 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-35213 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-35213?

CVE-2026-35213 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 26th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-35213?

CVE-2026-35213 is classified as CWE-1333 (CWE-1333). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-35213 published, and has it been updated?

CVE-2026-35213 was published on April 6, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-35213 — @hapi/content

Fix: hapijs/content#38

CVE-2026-35213 is a CWE-1333 vulnerability in @hapi/content. A fix is available for @hapi/content — see the affected versions and patch details below.

Regular Expression Denial of Service (ReDoS) in @hapi/content HTTP header parsing

Also known asCVE-2026-115728 GHSA-jg4p-7fhp-p32p

Published

Apr 6, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-35213.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk+0.01%

Lower risk than most CVEs26th percentile — riskier than 26% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

11other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@hapi/contentnpm

2.1Mdownloads / week

Description

All versions of @hapi/content through 6.0.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via crafted HTTP header values. Three regular expressions used to parse Content-Type and Content-Disposition headers contain patterns susceptible to catastrophic backtracking. This has been fixed in v6.0.1.

Impact

Denial of Service. An unauthenticated remote attacker can cause a Node.js process to become unresponsive by sending a single HTTP request with a maliciously crafted header value.

Patches

Fixed by tightening all three regular expressions to eliminate backtracking.

Workarounds

There are no known workarounds. Upgrade to the patched version.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@hapi/content`	all versions	6.0.1`npm install @hapi/content@6.0.1`

Affected Products

1 product · 1 configurations

Application

contentcontent_project

< 6.0.1

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @hapi/content, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @hapi/content to 6.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-35213 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

All versions of `@hapi/content` through 6.0.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via crafted HTTP header values. Three regular expressions used to parse `Content-Type` and `Content-Disposition` headers contain patterns susceptible to catastrophic backtracking. This has been fixed in v6.0.1. ### Impact Denial of Service. An unauthenticated remote attacker can cause a Node.js process to become unresponsive by sending a single HTTP request with a maliciously crafted header value. ### Patches Fixed by tightening all three regular expressions to eliminate backtrackin

O3 Security · Impact-Aware SCA

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