---
title: "CVE-2026-69153\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-2026-69153?format=md
keywords: index, follow
---

# CVE-2026-69153

Publication date 3 August 2026

Last updated 7 August 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-69153?format=md#impact-score)

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## Description

PostCSS takes a CSS file and provides an API to analyze and modify its
rules by transforming the rules into an Abstract Syntax Tree. Prior to
8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to
read an unintended source-map file by supplying an absolute or
directory-traversal sourceMappingURL. The resulting map’s sources and
sourcesContent may then be exposed to the application. This issue is fixed
in version 8.5.19.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| node-postcss | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |

---

* [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 v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-69153?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-69153?format=md)

**Base score**

6.3 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | Present |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | Low |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | None |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.3 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-69153)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-69153)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-69153)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-69153)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-69153>
* <https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp>
* <https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8>
* <https://github.com/postcss/postcss/releases/tag/8.5.19>