---
id: "CVE-2026-117913"
kind: "vulnerability"
aliases: ["CVE-2026-117913"]
title: "Firefox: use-after-free in SVG component may allow code execution"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "runtime"]
not_affected_if: ["already-updated"]
published_at: "2026-10-27T14:16:46+00:00"
first_seen_at: "2026-10-27T14:32:22+00:00"
updated_at: "2026-10-27T14:37:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117913", "first_seen_at": "2026-10-27T14:32:22+00:00"}]
---

# Firefox: use-after-free in SVG component may allow code execution

A use-after-free bug in the SVG rendering component of Firefox was fixed in Firefox 159 and Firefox ESR 153.6. Memory reuse after free can let a crafted page corrupt memory and potentially run code in the browser.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Firefox version in the About Firefox dialog or with `firefox --version`
- Compare against unknown fixed-version threshold for ESR users: ESR 153.6 is the fixed line
- Check whether the version is below `159` for standard release or below `153.6` for ESR

## Fix

- Update Firefox to `159` or later
- Update Firefox ESR to `153.6` or later

## Timeline

- 2026-10-27T14:32:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117913

## From the sources

Use-after-free in the SVG component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

---

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