VDB-363018 · CVE-2026-8389 · EUVD-2026-29464

Mozilla Firefox up to 150.0.2 JIT memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.4	$5k-$25k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Mozilla Firefox up to 150.0.2. The impacted element is an unknown function of the component JIT. The manipulation results in an unknown weakness. This vulnerability was named CVE-2026-8389. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 150.0.2. Affected is an unknown code block of the component JIT. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. The impact remains unknown. CVE summarizes:

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

The advisory is available at bugzilla.mozilla.org. This vulnerability is traded as CVE-2026-8389 since 05/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 06/17/2026).

Upgrading to version 150.0.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-29464) and CERT Bund (WID-SEC-2026-1503). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

Debian Linux
Red Hat Enterprise Linux
SUSE Linux
Oracle Linux
IGEL OS
SUSE openSUSE
RESF Rocky Linux
Mozilla Firefox

Productinfo

Type

Web Browser

Vendor

Mozilla

Name

Firefox

Version

License

open-source

Website

Vendor: https://www.mozilla.org/
Product: https://www.mozilla.org/en-US/firefox/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 8.8
ADP CISA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 150.0.3

Timelineinfo

05/12/2026 Advisory disclosed
05/12/2026 +0 days CVE reserved
05/12/2026 +0 days VulDB entry created
06/17/2026 +36 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-8389 (🔒)
GCVE (CVE): GCVE-0-2026-8389
GCVE (VulDB): GCVE-100-363018
EUVD: 🔒
CERT Bund: WID-SEC-2026-1503 - Mozilla Firefox: Mehrere Schwachstellen

Entryinfo

Created: 05/12/2026 15:44
Updated: 06/17/2026 22:17
Changes: 05/12/2026 15:44 (54), 05/12/2026 16:10 (1), 06/06/2026 22:09 (13), 06/17/2026 22:17 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.