What is the CVSS score of EUVD-2026-30896?

EUVD-2026-30896 has a CVSS 3.1 base score of 7.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. EPSS exploitation probability: 0.0%.

Which versions of Mozilla Firefox are affected by EUVD-2026-30896?

A memory corruption flaw in Firefox's core web rendering layer could allow attackers to compromise user systems or access sensitive data through malicious websites, affecting all Firefox users on…. A patch is available.

How to fix or mitigate EUVD-2026-30896?

Within 24 hours, inventory all Firefox browser deployments (standard Firefox, ESR 115.x, and ESR 140.x branches) across your organization and identify user populations requiring patches. Within 7 days, deploy Firefox 151 for users on standard track; ESR users on 115.x should update to ESR 115.36, and ESR 140.x users to ESR 140.11. Within 30 days, verify 100% of Firefox deployments are on the patched versions through configuration management or browser telemetry, and document compliance with patch policy.

Mozilla Firefox EUVD-2026-30896

| CVE-2026-8947 HIGH

Use After Free (CWE-416)

2026-05-19 mozilla

GHSA-6fhv-h367-4jc4

Information Disclosure Use After Free Memory Corruption Mozilla

7.3

CVSS 3.1 · Vendor: mozilla

Severity by source

Vendor (mozilla) PRIMARY

7.3 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

vuln.today AI

5.0 MEDIUM

Remote crafted content but victim must load the page (UI:R) and winning the use-after-free race is non-trivial (AC:H); no auth (PR:N) with partial C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

SUSE

HIGH

qualitative

Red Hat

7.5 HIGH

qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Jul 23, 2026 - 17:49 vuln.today

CVE Published

May 19, 2026 - 12:29 nvd

UNKNOWN (no severity yet)

CVE Published

May 19, 2026 - 12:29 cve.org

HIGH 7.3

DescriptionCVE.org

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.

AnalysisAI

Memory corruption in Mozilla Firefox's DOM Bindings (WebIDL) layer allows a remote attacker to trigger a use-after-free (CWE-416) by serving crafted web content, potentially leading to information disclosure or memory-corruption-based control-flow effects. The flaw affects Firefox before 151 and the ESR 115.x and 140.x branches, and is patched in Firefox 151, ESR 115.36, and ESR 140.11. No public exploit identified at time of analysis; EPSS probability is very low (0.05%) and CISA SSVC records no known exploitation.

Technical ContextAI

The vulnerability lives in Firefox's DOM Bindings (WebIDL) subsystem, the glue layer that maps JavaScript-visible DOM interfaces to their underlying C++ implementations. WebIDL-generated bindings manage object lifetimes and reference counting between the JS engine (SpiderMonkey) and native DOM objects; a use-after-free here (CWE-416) means an object is freed while a JavaScript-reachable reference still points at it, so subsequent access reads or writes reclaimed heap memory. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the desktop Firefox application as the affected product. Because bindings execute in the content process while parsing/scripting attacker-controlled pages, the trigger surface is any web page rendered by the browser.

RemediationAI

Vendor-released patch: upgrade to Firefox 151, Firefox ESR 115.36, or Firefox ESR 140.11 as appropriate for your channel, per the Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-46/ (and mfsa2026-47/48/50/51). Enterprise Linux users should apply the corresponding distribution updates: SUSE SUSE-SU-2026:2039 (https://www.suse.com/support/update/SUSE-SU-2026:2039/) and the Red Hat errata RHSA-2026:21378/21380/21381/21382/22325/22643 (https://access.redhat.com/errata/RHSA-2026:21378). Because the bug is in core DOM bindings there is no clean feature-level workaround; interim compensating controls until patching include restricting browsing to trusted sites, deploying strict content/JavaScript controls or an isolation/sandboxing layer (e.g., enterprise policy to limit untrusted content), all of which reduce usability and do not fully eliminate the exposure, so patching remains the only reliable fix.

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Vendor StatusVendor

SUSE

Severity: High

Product	Status
SUSE Linux Enterprise Server 12 SP5-LTSS	Fixed
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5	Fixed
openSUSE Tumbleweed	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS	Affected

EUVD-2026-30896 vulnerability details – vuln.today

Back

Mozilla Firefox EUVD-2026-30896

Severity by source

CVSS VectorVendor: mozilla

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Mozilla

Same weakness CWE-416 – Use After Free

Same technique Information Disclosure

Vendor StatusVendor

SUSE

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External POC / Exploit Code