# CVE-2026-35213: hapijs @hapi/content ReDoS in HTTP header parsing

Source: https://junglewise.ai/threats/cve-2026-35213-hapijs-hapi-content-redos-in-http-header-parsing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-06. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-35213 · Severity: high · CVSS 7.5 · Published 2026-04-06

@hapi/content is a utility library used by the Hapi web framework to process HTTP headers. A vulnerability in how it handles specific headers allows an attacker to crash or freeze the server by sending a single, specially crafted web request. This results in a denial-of-service (DoS) condition, making the application unavailable to legitimate users.

Technologies: [Hapi Content](https://junglewise.ai/threats/technologies/content), [@hapi/content (npm)](https://junglewise.ai/threats/technologies/hapi-content). Vendors: [Hapi](https://junglewise.ai/threats/vendors/hapi), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-35213 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35213 being exploited in the wild.

**How severe is CVE-2026-35213?** High severity, with a CVSS score of 7.5, published 6 April 2026.

**Which products and versions are affected?** Hapi Content <= 6.0.0; @hapi/content (npm) <= 6.0.0, SEMVER:introduced=0,fixed=6.0.1.

**Is there a fix for CVE-2026-35213?** Yes. @hapi/content (npm): upgrade to 6.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-35213 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-35213?** Check whether you run Hapi Content or @hapi/content (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @hapi/content (npm): upgrade to 6.0.1 or later

  ```sh
  npm install @hapi/content@6.0.1
  ```


## Technical details

The @hapi/content library contains three regular expressions used for parsing 'Content-Type' and 'Content-Disposition' headers that are susceptible to catastrophic backtracking (CWE-1333). An unauthenticated remote attacker can exploit this by sending a crafted HTTP request containing a malicious header value. Because Node.js is single-threaded, the resulting CPU exhaustion causes the event loop to block, leading to a complete process hang or denial of service. The issue is resolved in version 6.0.1 by tightening the regex patterns to eliminate inefficient backtracking.

## Affected products

- hapijs content <= 6.0.0

## Identifiers

- CVE-2026-35213
- GHSA-jg4p-7fhp-p32p

## Timeline

- 2026-04-02: patched: Fix merged in pull request #38 and version 6.0.1 released
- 2026-04-02: advisory: GitHub Security Advisory GHSA-jg4p-7fhp-p32p published
- 2026-04-06: disclosed: CVE-2026-35213 published to NVD

## References

- [https://github.com/hapijs/content/pull/38](https://github.com/hapijs/content/pull/38)
- [https://github.com/hapijs/content/security/advisories/GHSA-jg4p-7fhp-p32p](https://github.com/hapijs/content/security/advisories/GHSA-jg4p-7fhp-p32p)

## Related threats

- [@hapi/content ReDoS in Content-Disposition parsing](https://junglewise.ai/threats/cve-2026-119202-hapi-content-provides-http-content-header-parsing-from-3-0-6)
- [hapijs @hapi/content parameter smuggling in header parsing](https://junglewise.ai/threats/cve-2026-44974-hapijs-hapi-content-parameter-smuggling-in-header-parsing)
- [hapi @hapi/content denial of service in HTTP header parser](https://junglewise.ai/threats/hapi-hapi-content-denial-of-service-in-http-header-parser-d6ae9a5f)