# CVE-2026-18772: Denial of service in rlottie

> Attackers can cause denial of service via exponential data expansion in the rlottie library due to improper memory allocation controls.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-18772, GHSA-9hrp-c4q8-hf75, UBUNTU-CVE-2026-18772

## What is CVE-2026-18772?

CVE-2026-18772 is a medium-severity denial of service vulnerability in Samsung Open Source rlottie, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improperly controlled sequential memory allocation vulnerability in Samsung Open Source rlottie allows Exponential Data Expansion.

Weakness: CWE-1325 (Improperly Controlled Sequential Memory Allocation)

## Which versions are affected by CVE-2026-18772?

It affects 1 product.


Products: Samsung Rlottie.

## How do I fix CVE-2026-18772?

Upgrade to a fixed version.

## Is CVE-2026-18772 being exploited?

There is no known exploitation of CVE-2026-18772 in the wild and no public exploit code.

## Other vulnerabilities in Samsung Open Source rlottie

- [CVE-2026-19587](https://insights.sbomify.com/CVE-2026-19587/): Denial of service in rlottie (medium 6.5)
- [CVE-2026-19588](https://insights.sbomify.com/CVE-2026-19588/): Integer overflow in rlottie (medium 6.5)
- [CVE-2026-19517](https://insights.sbomify.com/CVE-2026-19517/): Denial of service in rlottie (medium 6.5)
- [CVE-2026-19518](https://insights.sbomify.com/CVE-2026-19518/): Integer overflow in rlottie (medium 6.5)
- [CVE-2026-15551](https://insights.sbomify.com/CVE-2026-15551/): Integer overflow in rlottie (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18772 and fix it if it is affected.

What it is: CVE-2026-18772 is a medium-severity denial of service vulnerability in Samsung Open Source rlottie, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-18772 in the wild and no public exploit code.

Affected product: Samsung Open Source rlottie. 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-2026-18772/ (Markdown: https://insights.sbomify.com/CVE-2026-18772/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18772
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18772
- OSV: https://osv.dev/vulnerability/CVE-2026-18772

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18772/
Summaries are generated and may contain mistakes; the official description above is the record.