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Mozilla Firefox CVE-2026-16350

| EUVDEUVD-2026-46190 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-rjxr-w76j-p937
Buffer Overflow Red Hat Mozilla
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Client-side media-decoding bug needs the victim to load malicious content (UI:R) and heap grooming for reliable exploitation (AC:H); no auth needed (PR:N) and memory corruption threatens full C/I/A within the content process (S:U).

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
CRITICAL
qualitative
Red Hat
7.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:16 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.8

DescriptionCVE.org

Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

AnalysisAI

Memory corruption in the cubeb audio/video library used by Mozilla Firefox arises from incorrect boundary conditions (CWE-119), and Mozilla fixed it in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13 (advisories MFSA2026-68/69/70). The input CVSS rates it 9.8 (network, no privileges, no user interaction), implying an unauthenticated remote attacker could corrupt memory in the browser and potentially achieve code execution, though as a media-processing flaw real exploitation almost certainly requires a victim to render attacker-controlled audio/video content. There is no public exploit identified at time of analysis and EPSS is low (0.15%, 5th percentile), and it is not in CISA KEV.

Technical ContextAI

cubeb is Mozilla's cross-platform audio input/output abstraction library that Firefox uses to route decoded audio streams to the operating system's audio backend (e.g., PulseAudio/ALSA on Linux, WASAPI on Windows, CoreAudio on macOS). The root cause is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), and the 'Buffer Overflow' tag confirms an out-of-bounds read/write driven by 'incorrect boundary conditions' - meaning size, offset, or channel/sample-count validation in the audio pipeline can be miscalculated, allowing memory adjacent to an audio buffer to be accessed. Because cubeb handles data derived from parsed/decoded media, malformed stream parameters (sample rate, channel count, buffer framing) are a plausible trigger surface. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* scopes the affected product to the Firefox application across versions prior to the fixed builds.

RemediationAI

Vendor-released patch: upgrade to Firefox 153, Firefox ESR 115.38, or Firefox ESR 140.13 depending on your channel; this is the primary and complete fix and should be applied via Firefox's built-in updater or your enterprise deployment tooling (ESR/MSI/policy). Confirm the exact fixed version for your branch against the matching advisory: MFSA2026-68/69/70 at https://www.mozilla.org/security/advisories/mfsa2026-68/ , /mfsa2026-69/ , and /mfsa2026-70/ . If immediate patching is not possible, compensating controls target the media-decoding trigger: disabling autoplay of audio/video reduces drive-by triggering (trade-off: minor usability loss), and deploying a content/ad blocker or restricting untrusted media-heavy sites lowers exposure to hostile streams. Because the flaw is in the audio subsystem, tightening OS-level sandboxing/least-privilege for the browser process limits blast radius, though none of these substitute for the update. Do not rely on workarounds long-term - the code fix in the listed versions is the authoritative remediation.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2023-4966 HIGH POC
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Same technique Buffer Overflow

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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
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CVE-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-16350 vulnerability details – vuln.today
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