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Firefox CVE-2026-7320

| EUVDEUVD-2026-26057 HIGH
Buffer Overflow (CWE-119)
2026-04-28 mozilla
Buffer Overflow Information Disclosure Mozilla
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

6
Re-analysis Queued
Apr 28, 2026 - 20:23 vuln.today
cvss_changed
Analysis Generated
Apr 28, 2026 - 17:00 vuln.today
CVSS changed
Apr 28, 2026 - 16:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 28, 2026 - 14:30 euvd
EUVD-2026-26057
Analysis Generated
Apr 28, 2026 - 14:30 vuln.today
CVE Published
Apr 28, 2026 - 13:49 nvd
HIGH 7.5

DescriptionCVE.org

Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, and Firefox ESR 115.35.1.

AnalysisAI

Information disclosure in Mozilla Firefox, Firefox ESR 140, and Firefox ESR 115 allows remote unauthenticated attackers to extract sensitive data via incorrect boundary conditions in the Audio/Video component. The vulnerability permits network-based exploitation with low complexity and no user interaction (CVSS:3.1/AV:N/AC:L/PR:N/UI:N), enabling unauthorized access to high-confidentiality information. Mozilla released patches in Firefox 150.0.1, Firefox ESR 140.10.1, and Firefox ESR 115.35.1 (confirmed by vendor advisories MFSA2026-35/36/37). SSVC indicates automatable exploitation with partial technical impact, though no public exploit or active exploitation is identified at time of analysis.

Technical ContextAI

The vulnerability resides in Firefox's Audio/Video processing component and stems from incorrect boundary conditions (CWE-119), a class of buffer handling flaws where code fails to properly verify that data operations stay within allocated memory bounds. The 'Buffer Overflow' tag combined with CWE-119 suggests the boundary error may involve buffer length calculations during media codec operations, audio/video stream parsing, or multimedia container format processing. Affected products per CPE include Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) across three major release channels: mainline Firefox (<150.0.1), Extended Support Release 140 branch (<140.10.1), and ESR 115 long-term support branch (<115.35.1). The Audio/Video subsystem likely uses native code (C/C++) for performance-critical media decoding where boundary miscalculations can expose adjacent memory contents without causing a crash, enabling information leakage rather than code execution.

RemediationAI

Upgrade immediately to vendor-released patched versions: Firefox 150.0.1 for mainline users, Firefox ESR 140.10.1 for organizations on the 140 extended support channel, or Firefox ESR 115.35.1 for long-term support deployments. Download patches directly from https://www.mozilla.org/firefox/ or use enterprise update mechanisms. Verify installed version via Firefox menu → Help → About Firefox to confirm successful patching. For environments unable to patch immediately, implement compensating controls: configure Firefox Enterprise Policy to disable automatic media playback (DisableMediaPlayback=true in policies.json) which reduces but does not eliminate attack surface as users can still manually initiate media processing; restrict Firefox usage to trusted internal sites only via proxy whitelisting or network segmentation; or temporarily substitute alternative browsers for untrusted web browsing until patching is complete. Note that disabling media playback significantly degrades user experience for legitimate multimedia content and should be considered a short-term emergency mitigation only. Detailed technical guidance is available in Mozilla advisories MFSA2026-35/36/37.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Workstation Extension 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-7320 vulnerability details – vuln.today
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