What is the CVSS score of EUVD-2026-30906?

EUVD-2026-30906 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Mozilla Firefox are affected by EUVD-2026-30906?

A memory-safety vulnerability in Mozilla Firefox's audio/video component (CVE-2026-8954, CVSS 7.5) could allow remote attackers to compromise user confidentiality through crafted media files,…. A patch is available.

How to fix or mitigate EUVD-2026-30906?

Within 24 hours, conduct a complete inventory of Firefox installations and notify browser management teams to prepare for patching. Within 7 days, begin staged deployment of Firefox 151 (or Firefox ESR 140.11 for ESR-track systems) starting with a pilot group to confirm compatibility and stability. Complete full organizational deployment within 30 days, prioritizing high-use Firefox populations.

Mozilla Firefox EUVD-2026-30906

| CVE-2026-8954 HIGH

Buffer Overflow (CWE-119)

2026-05-19 mozilla

GHSA-4g4m-32hr-qwg6

Buffer Overflow Mozilla

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

vuln.today AI

6.5 MEDIUM

Remote crafted media over the network with no auth (AV:N/PR:N), but a browser must load the content so UI:R; NVD-consistent confidentiality-only memory disclosure (C:H/I:N/A:N).

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

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

SUSE

HIGH

qualitative

Red Hat

6.1 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Jul 23, 2026 - 17:43 vuln.today

CVE Published

May 19, 2026 - 12:29 nvd

UNKNOWN (no severity yet)

CVE Published

May 19, 2026 - 12:29 cve.org

HIGH 7.5

DescriptionCVE.org

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.

AnalysisAI

Memory-safety corruption in the Audio/Video component of Mozilla Firefox stems from incorrect boundary conditions combined with an integer overflow, and is fixed in Firefox 151 and Firefox ESR 140.11. Remote attackers can trigger the flaw by serving crafted media to an affected browser, with NVD scoring a high confidentiality impact (CVSS 7.5, C:H/I:N/A:N); there is no public exploit identified at time of analysis and EPSS is very low (0.03%, 10th percentile). CISA's SSVC framework marks exploitation status as none but flags the issue as automatable with partial technical impact.

Technical ContextAI

The defect lives in Firefox's Audio/Video media-handling pipeline, which decodes and processes untrusted audio and video streams delivered over the web. The root cause is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer): an integer overflow in size/length arithmetic produces an undersized or miscomputed allocation, and the subsequent bounds check is incorrect, allowing reads or writes outside the intended buffer. In C/C++ media parsers this typically arises when a length or dimension field from the container/codec is multiplied or added without overflow guards, wrapping to a small value that then governs buffer access. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* (all Firefox prior to the fixed builds), and the same engine underlies Firefox ESR and downstream rebuilds shipped by Red Hat and SUSE.

RemediationAI

Vendor-released patch: upgrade to Firefox 151 or Firefox ESR 140.11, which contain the fix per Mozilla's advisories (https://www.mozilla.org/security/advisories/mfsa2026-50/ and https://www.mozilla.org/security/advisories/mfsa2026-51/). Organizations running distribution-packaged builds should apply their vendor update, e.g. SUSE users install the fixed package from SUSE-SU-2026:2039 (https://www.suse.com/support/update/SUSE-SU-2026:2039/) and Red Hat users apply the corresponding erratum. If immediate patching is not possible, compensating controls specific to a media-parsing bug include disabling or restricting audio/video autoplay and media decoding where feasible, and deploying enterprise policy to limit browsing to trusted sites; note these degrade normal web functionality and do not fully close the vector, so they are stopgaps until the browser update is deployed. Because the flaw is reached through web content, prompt browser auto-update is the most reliable mitigation.

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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-2026-30906 vulnerability details – vuln.today

Back

Mozilla Firefox EUVD-2026-30906

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Mozilla

Same weakness CWE-119 – Buffer Overflow

Same technique Buffer Overflow

Vendor StatusVendor

SUSE

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External POC / Exploit Code