SB2026022446 - Multiple vulnerabilities in Mozilla Firefox
Published: February 24, 2026 Updated: February 25, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 51 secuirty vulnerabilities.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-2777)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to application does not properly impose security restrictions in the Messaging System component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
2) Use-after-free (CVE-ID: CVE-2026-2789)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error in the Graphics: ImageLib component. A remote attacker can trick the victim into visiting a specially crafted webpage and crash the browser.
3) Buffer overflow (CVE-ID: CVE-2026-2788)
The vulnerability allows a remote attacker to crash the browser
The vulnerability exists due to a boundary error in the Audio/Video: GMP component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
4) Use-after-free (CVE-ID: CVE-2026-2787)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error in the DOM: Window and Location component. A remote attacker can trick the victim into visiting a specially crafted webpage and crash the browser.
5) Buffer overflow (CVE-ID: CVE-2026-2778)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML code in the DOM: Core & HTML component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
6) Buffer overflow (CVE-ID: CVE-2026-2776)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the Telemetry component in External Software. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption to bypass sandbox restrictions and execute arbitrary code on the target system.
7) Buffer overflow (CVE-ID: CVE-2026-2757)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content in WebRTC: Audio/Video component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
8) Protection mechanism failure (CVE-ID: CVE-2026-2775)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the DOM: HTML Parser component. An attacker can trick the victim into visiting a specially crafted website and compromise the affected system.
9) Integer overflow (CVE-ID: CVE-2026-2774)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in the Audio/Video component. A remote attacker can trick the victim into visiting a specially crafted website, trigger an integer overflow and execute arbitrary code on the target system.
10) Buffer overflow (CVE-ID: CVE-2026-2773)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the Web Audio component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
11) Use-after-free (CVE-ID: CVE-2026-2772)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the Audio/Video: Playback component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
12) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2026-2771)
The vulnerability allows a remote attacker to execute arbitrary code on the system.
The vulnerability exists due to improper input validation in the DOM: Core & HTML component. A remote attacker can execute arbitrary JavaScript code in the browser leading to a system compromise.
13) Use-after-free (CVE-ID: CVE-2026-2770)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the DOM: Bindings (WebIDL) component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
14) Use-after-free (CVE-ID: CVE-2026-2769)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the Storage: IndexedDB component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
15) Use-after-free (CVE-ID: CVE-2026-2764)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript Engine: JIT component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
16) Use-after-free (CVE-ID: CVE-2026-2763)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript Engine component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
17) Buffer overflow (CVE-ID: CVE-2026-2761)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content in in the Graphics: WebRender component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption to bypass sandbox restrictions and execute arbitrary code on the target system.
18) Buffer overflow (CVE-ID: CVE-2026-2760)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content in in the Graphics: WebRender component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption to bypass sandbox restrictions and execute arbitrary code on the target system.
19) Buffer overflow (CVE-ID: CVE-2026-2759)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content in the Graphics: ImageLib component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
20) Use-after-free (CVE-ID: CVE-2026-2758)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in JavaScript: GC component. A remote attacker can trick the victim into visiting a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
21) Buffer overflow (CVE-ID: CVE-2026-2793)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
22) Buffer overflow (CVE-ID: CVE-2026-2792)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
23) Integer overflow (CVE-ID: CVE-2026-2781)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to integer overflow in the Libraries component in NSS. A remote attacker can trick the victim into visiting a specially crafted website, trigger an integer overflow and crash the browser.
24) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-2780)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Netmonitor component. A remote attacker can escalate privileges on the system.
25) Buffer overflow (CVE-ID: CVE-2026-2779)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a boundary error when processing HTML content in the Networking: JAR component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and crash the browser.
26) Protection mechanism failure (CVE-ID: CVE-2026-2768)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient implementation of security measures in the Storage: IndexedDB component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
27) Use-after-free (CVE-ID: CVE-2026-2767)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript: WebAssembly component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
28) Use-after-free (CVE-ID: CVE-2026-2766)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript Engine: JIT component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
29) Integer overflow (CVE-ID: CVE-2026-2762)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in the JavaScript: Standard Library component. A remote attacker can trick the victim into visiting a specially crafted website, trigger an integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
30) Use-after-free (CVE-ID: CVE-2026-2765)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript Engine component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
31) Protection mechanism failure (CVE-ID: CVE-2026-2791)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the Networking: Cache component. An attacker can bypass implemented security restrictions.
32) Protection mechanism failure (CVE-ID: CVE-2026-2790)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the Networking: JAR component. An attacker can bypass same-origin policy.
33) Use-after-free (CVE-ID: CVE-2026-2786)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error in the JavaScript Engine component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
34) Information disclosure (CVE-ID: CVE-2026-2783)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to JIT miscompilation in the JavaScript Engine: JIT component. A remote attacker can gain unauthorized access to sensitive information.
35) NULL pointer dereference (CVE-ID: CVE-2026-2785)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the JavaScript Engine component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
36) Protection mechanism failure (CVE-ID: CVE-2026-2784)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the DOM: Security component. An attacker can bypass implemented security restrictions.
37) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-2782)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions in the Netmonitor component. A remote attacker can escalate privileges on the system.
38) Use-after-free (CVE-ID: CVE-2026-2804)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error in the JavaScript: WebAssembly component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
39) Use-after-free (CVE-ID: CVE-2026-2799)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the DOM: Core & HTML component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
40) Use-after-free (CVE-ID: CVE-2026-2798)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the DOM: Core & HTML component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
41) Use-after-free (CVE-ID: CVE-2026-2797)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript: GC component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
42) Buffer overflow (CVE-ID: CVE-2026-2796)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the JavaScript: WebAssembly component. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
43) Use-after-free (CVE-ID: CVE-2026-2795)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the JavaScript: GC component. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
44) Out-of-bounds read (CVE-ID: CVE-2026-2794)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition. A remote attacker can trick the victim into visiting a specially crafted website, trigger an out-of-bounds read error and read contents of memory on the system.
45) Out-of-bounds read (CVE-ID: CVE-2026-2806)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in the Graphics: Text component. A remote attacker can trick the victim into visiting a specially crafted website and read parts of uninitialized memory.
46) Buffer overflow (CVE-ID: CVE-2026-2807)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
47) NULL pointer dereference (CVE-ID: CVE-2026-2805)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the DOM: Core & HTML component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
48) Protection mechanism failure (CVE-ID: CVE-2026-2803)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the Settings UI component. An attacker can bypass implemented security restrictions and gain access to sensitive information.
49) Buffer overflow (CVE-ID: CVE-2026-2801)
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a boundary error in the JavaScript: WebAssembly component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
50) Spoofing attack (CVE-ID: CVE-2026-2800)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in the WebAuthn component. A remote attacker can perform a spoofing attack.
51) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-2802)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to a race condition in the JavaScript: GC component. A remote attacker can bypass implemented security restrictions.
Remediation
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