CVE-2026-4725Disclosure(mozilla / firefox)

LOWCVSS 10.0 · CRITICAL

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch mozilla firefox systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

mozilla CVEs Back to dashboard

2.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://www.mozilla.org/security/advisories/mfsa2026-20/

Other references

Weakness type (CWE)

CWE-416

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

firefox

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
4 mentions across 2 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 1 signal
Technical details provided in 4 signals
Disclosure: 4 classified signals
Peaked 1d ago at 3 mentions (2026-03-24); latest day: 1
4 total mentions across 2 days

Affected systems

Vendors

mozilla

Products

firefox

Deep dive

Activity timeline4 mentions / 2d

Signal classification1 categories

Disclosure

4100.0%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-24	3	Disclosure3
2026-03-25	1	Disclosure1

Full discourse4 posts

maruomosquit@maru1151157197d
Disclosure
🚨 CVE-2026-4725 (CVSS: 10.0) FirefoxおよびThunderbirdのGraphics: Canvas2Dコンポーネントにおけるuse-after-freeによりサンドボックス回避が可能。Firefox <149およびThunderbird <149に影響。バージョン149以上に更新。 https://maruomosquit.com/vulnerability/CVE-2026-4725/ #脆弱性 #セキュリティ
Post summary
A critical use‑after‑free vulnerability (CVE‑2026‑4725) in Firefox and Thunderbird’s Canvas2D component has been disclosed, and users are advised to upgrade to version 149 or newer.
0002055
1.7K followersView on X
The Hacker Wire@TheHackerWire197d
Disclosure
🔴 CVE-2026-4725 - Critical Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox &lt; 149 and Thunderbird &lt; 149. https://www.thehackerwire.com/vulnerability/CVE-2026-4725/ https://t.co/jMc90UmVyc
Post summary
CVE-2026-4725 is a newly disclosed critical vulnerability causing a sandbox escape via a use‑after‑free in Firefox and Thunderbird’s Canvas2D component for versions prior to 149.
0000050
145 followersView on X
Vulmon Vulnerability Feed@VulmonFeeds197d
Disclosure
CVE-2026-4725 Use-After-Free Sandbox Escape in Firefox Canvas2D Before Version 149 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-4725
Post summary
This brief notice announces CVE-2026-4725, a Use-After-Free sandbox escape in Firefox Canvas2D before version 149, without references to PoC, exploit code, or mitigation.
0000043
4.0K followersView on X
CVE@CVEnew197d
Disclosure
CVE-2026-4725 Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149. https://www.cve.org/CVERecord?id=CVE-2026-4725
Post summary
The text announces CVE‑2026‑4725, describing a sandbox escape via use‑after‑free in Firefox’s Canvas2D component, with no PoC, exploit, active exploitation, or patch information provided.
00000105
56.8K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-

Explore more

Back to dashboard mozilla CVEs firefox vulnerabilities

What researchers are saying

CVE-2026-4725

maruomosquit[verified]@maru1151157Disclosure

A critical use‑after‑free vulnerability (CVE‑2026‑4725) in Firefox and Thunderbird’s Canvas2D component has been disclosed, and users are advised to upgrade to version 149 or newer.

The Hacker Wire@TheHackerWireDisclosure

CVE-2026-4725 is a newly disclosed critical vulnerability causing a sandbox escape via a use‑after‑free in Firefox and Thunderbird’s Canvas2D component for versions prior to 149.

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

This brief notice announces CVE-2026-4725, a Use-After-Free sandbox escape in Firefox Canvas2D before version 149, without references to PoC, exploit code, or mitigation.

CVE@CVEnewDisclosure

The text announces CVE‑2026‑4725, describing a sandbox escape via use‑after‑free in Firefox’s Canvas2D component, with no PoC, exploit, active exploitation, or patch information provided.