# CVE-2026-93653: Denial of service in Red Hat Enterprise Linux 10

> A crafted PDF can cause Poppler's Splash backend to enter an unbounded CPU loop, leading to denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-93653, ECHO-dbb5-4d25-3409, GHSA-84rg-5qf5-cx44, UBUNTU-CVE-2026-93653

## What is CVE-2026-93653?

CVE-2026-93653 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 18 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A denial of service flaw was found in Poppler's Splash backend. A crafted PDF with tiling-pattern geometry approaching the int32 boundary can cause SplashOutputDev::tilingPatternFill to compute an attacker-controlled repeat count that drives an excessively long loop in the pattern-fill scanline routine, without a corresponding memory allocation. An attacker could exploit this by supplying a malicious PDF to an application that renders it via Poppler's Splash backend, causing the rendering process to consume 100% CPU for an attacker-controlled, extended duration.

Weakness: CWE-606 (Unchecked Input for Loop Condition)

## Which versions are affected by CVE-2026-93653?


## How do I fix CVE-2026-93653?

No fix has been published for CVE-2026-93653 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93653 being exploited?

There is no known exploitation of CVE-2026-93653 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93653 and fix it if it is affected.

What it is: CVE-2026-93653 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 18 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-93653 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-93653/ (Markdown: https://insights.sbomify.com/CVE-2026-93653/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93653
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93653
- OSV: https://osv.dev/vulnerability/CVE-2026-93653

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93653/
Summaries are generated and may contain mistakes; the official description above is the record.