# CVE-2026-13593: CSS::Minifier::XS versions before 0.14 for Perl have a memory leak when the entire document is minified away

> A memory leak in the Perl CSS::Minifier::XS library allows attackers to cause denial of service by submitting documents consisting solely of removable characters.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** ALPINE-CVE-2026-13593, DEBIAN-CVE-2026-13593, GHSA-89gv-4m9m-97p2, MGASA-2026-0267, UBUNTU-CVE-2026-13593, openSUSE-SU-2026:11157-1

## What is CVE-2026-13593?

CVE-2026-13593 is a medium-severity denial of service vulnerability in GTERMARS CSS::Minifier::XS, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CSS::Minifier::XS versions before 0.14 for Perl have a memory leak when the entire document is minified away.

The minify function has a memory leak when processing a document containing only characters to be removed, such as comments and whitespace.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2026-13593?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `perl-CSS-Minifier-XS` | openSUSE:Tumbleweed | All versions | 0.140.0-1.1 |

## How do I fix CVE-2026-13593?

Upgrade to a fixed version.

## Is CVE-2026-13593 being exploited?

There is no known exploitation of CVE-2026-13593 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13593 and fix it if it is affected.

What it is: CVE-2026-13593 is a medium-severity denial of service vulnerability in GTERMARS CSS::Minifier::XS, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13593 in the wild and no public exploit code.

Affected product: GTERMARS CSS::Minifier::XS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-13593/ (Markdown: https://insights.sbomify.com/CVE-2026-13593/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13593
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13593
- OSV: https://osv.dev/vulnerability/CVE-2026-13593

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13593/
Summaries are generated and may contain mistakes; the official description above is the record.