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Mozilla Firefox CVE-2026-7322

| EUVDEUVD-2026-26059 HIGH
Buffer Overflow (CWE-119)
2026-04-28 mozilla
RCE Buffer Overflow Mozilla
7.3
CVSS 3.1 · Vendor: mozilla
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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
7.5 HIGH

Browser memory-corruption needs victim to load malicious content (UI:R) and significant exploit effort (AC:H), but successful RCE yields full high C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.8 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

4
Analysis Generated
Jul 24, 2026 - 04:24 vuln.today
CVSS changed
Apr 28, 2026 - 22:22 NVD
7.3 (HIGH)
EUVD ID Assigned
Apr 28, 2026 - 14:30 euvd
EUVD-2026-26059
CVE Published
Apr 28, 2026 - 13:49 nvd
HIGH 7.3

DescriptionCVE.org

Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0, Thunderbird ESR 140.10.0, Firefox 150.0.0 and Thunderbird 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, and Firefox ESR 115.35.1.

AnalysisAI

Memory corruption in Mozilla Firefox 150.0.0, Firefox ESR 140.10.0/115.35.0 and Thunderbird 150.0.0/140.10.0 arises from a collection of memory safety bugs (CWE-119) that Mozilla assesses could, with sufficient effort, be leveraged to run arbitrary code. This is a batch 'memory safety' advisory (MFSA 2026-35 through 2026-39) tracking ~19 internally-found Bugzilla issues rather than a single weaponized flaw. There is no public exploit identified at time of analysis, EPSS is very low (0.04%), and CISA SSVC records exploitation status as none.

Technical ContextAI

The affected component is the Firefox/Thunderbird browser engine (Gecko), which shares the same C/C++ rendering, JavaScript, and media-processing code across the desktop browser and the Thunderbird mail client. CWE-119 (improper restriction of operations within the bounds of a memory buffer) is the root-cause class covering buffer overflows, out-of-bounds reads/writes, and use-after-style corruption in native code that lacks memory-safety guarantees. Mozilla's memory-safety roll-up advisories aggregate multiple such defects found via fuzzing and internal auditing; some showed 'evidence of memory corruption,' which is Mozilla's standard phrasing for bugs that crash under conditions suggesting attacker-influenceable memory state. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the Firefox application as the primary affected product, though the advisory text and downstream Red Hat errata (RHSA-2026:19153 onward) extend the same fixes to Thunderbird and ESR channels.

RemediationAI

Vendor-released patch: upgrade to Firefox 150.0.1, Firefox ESR 140.10.1, or Firefox ESR 115.35.1 as listed in the Mozilla advisories (MFSA 2026-35/36/37/38/39). Thunderbird users on 150.0.0 / ESR 140.10.0 should apply the corresponding Thunderbird security update from the same advisory family; the CVE text names Firefox fix versions explicitly, so confirm the exact Thunderbird build via the Mozilla advisory before deploying. On Red Hat-family systems, apply the mapped errata (e.g., RHSA-2026:19153/19157/19348 and later) via your package manager. Because these are memory-safety bugs with no configuration-based trigger, there is no clean feature-level workaround; interim compensating controls are limited to reducing exposure to untrusted content - for Thunderbird, disabling remote content and JavaScript in message display lowers the mail-borne attack surface (trade-off: broken rendering of some HTML mail), and enforcing rapid auto-update across the fleet is the reliable mitigation. Advisory URL: https://www.mozilla.org/security/advisories/mfsa2026-35/.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2023-4966 HIGH POC
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CVE-2013-3660 HIGH POC
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Same technique RCE

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CVE-2023-3519 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2016-4117 CRITICAL POC
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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-2026-7322 vulnerability details – vuln.today
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