---
id: "CVE-2026-117926"
kind: "vulnerability"
aliases: ["CVE-2026-117926"]
title: "Firefox: incorrect boundary checks in SVG component, fixed in 159"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "desktop", "firefox", "runtime"]
not_affected_if: ["already-on-fixed-version"]
published_at: "2026-10-27T14:16:48+00:00"
first_seen_at: "2026-10-27T14:32:23+00:00"
updated_at: "2026-10-27T14:37:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117926", "first_seen_at": "2026-10-27T14:32:23+00:00"}]
---

# Firefox: incorrect boundary checks in SVG component, fixed in 159

Firefox's SVG rendering code has incorrect boundary conditions, a memory-safety class of flaw. The sources do not say what an attacker can achieve beyond that, so the exact impact is unknown.

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

## How to check

- Check the installed Firefox version in About Firefox or with `firefox --version`; releases before `159`, `115.44` ESR, or `153.6` ESR are in scope.

## Fix

- Update Firefox to `159` or to ESR `115.44` or `153.6`.

## Timeline

- 2026-10-27T14:32:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117926

## From the sources

Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.

---

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