---
title: "CVE-2026-13697\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-13697?format=md
keywords: index, follow
---

# CVE-2026-13697

Publication date 29 July 2026

Last updated 7 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.4 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-13697?format=md#impact-score)

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## Description

undici's cache interceptor mishandles malformed Cache-Control private
directives. In undici 7.0.0 up to before 7.29.0 and 8.0.0 up to before
8.9.0, a response carrying a degenerate qualified private directive, such
as private set to an empty value, can be stored in the default shared cache
and later served to a different caller with the same cache key, disclosing
private response bodies and headers including Set-Cookie. Separately, a
Cache-Control header that combines an unqualified private directive with a
qualified one triggers an uncaught TypeError in the cache-control parser,
which rejects the request and, depending on the consumer's error handling,
can terminate the process. Both issues affect applications using the cache
interceptor in shared mode, including the default configuration. The issues
are fixed in undici 7.29.0 and 8.9.0.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| node-undici | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.4 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.4 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-13697)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-13697)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-13697)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-13697)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-13697>
* <https://github.com/nodejs/undici/security/advisories/GHSA-4cwx-7wf7-3272>