Mozilla Foundation Security Advisory 2025-14

Security Vulnerabilities fixed in Firefox 136

Announced
March 4, 2025
Impact
high
Products
Firefox
Fixed in
  • Firefox 136

#CVE-2025-1930: AudioIPC StreamData could trigger a use-after-free in the Browser process

Reporter
dalmurino
Impact
high
Description

On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-after-free in the Browser process. This could have led to a sandbox escape.

References

#CVE-2025-1939: Tapjacking in Android Custom Tabs using transition animations

Reporter
Philipp Beer
Impact
high
Description

Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking.

References

#CVE-2025-1931: Use-after-free in WebTransportChild

Reporter
sherkito
Impact
high
Description

It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash.

References

#CVE-2025-1932: Inconsistent comparator in XSLT sorting led to out-of-bounds access

Reporter
Ivan Fratric of Google Project Zero
Impact
high
Description

An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-bounds access. Only affected version 122 and later.

References

#CVE-2025-1933: JIT corruption of WASM i32 return values on 64-bit CPUs

Reporter
Xiangwei Zhang and kkdong of Tencent Security YUNDING LAB
Impact
high
Description

On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type.

References

#CVE-2025-1940: Android Intent confirmation prompt tapjacking using Select options

Reporter
Shaheen Fazim
Impact
moderate
Description

A select option could partially obscure the confirmation prompt shown before launching external apps. This could be used to trick a user in to launching an external app unexpectedly.
This issue only affects Android versions of Firefox.

References

#CVE-2024-9956: Passkey phishing within Bluetooth range

Reporter
MasterSplinter
Impact
moderate
Description

Malicious pages could use Firefox for Android to pass FIDO: links to the OS and trigger the "hybrid" passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's computer into the target account.

References

#CVE-2025-1934: Unexpected GC during RegExp bailout processing

Reporter
Nils Bars
Impact
moderate
Description

It was possible to interrupt the processing of a RegExp bailout and run additional JavaScript, potentially triggering garbage collection when the engine was not expecting it.

References

#CVE-2025-1941: Lock screen setting bypass in Firefox Focus for Android

Reporter
Jurrie Overgoor
Impact
moderate
Description

Under certain circumstances, a user opt-in setting that Focus should require authentication before use could have been be bypassed (distinct from CVE-2025-0245).

References

#CVE-2025-1942: Disclosure of uninitialized memory when .toUpperCase() causes string to get longer

Reporter
anbu
Impact
moderate
Description

When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string

References

#CVE-2025-1935: Clickjacking the registerProtocolHandler info-bar

Reporter
Hafiizh
Impact
low
Description

A web page could trick a user into setting that site as the default handler for a custom URL protocol.

References

#CVE-2025-1936: Adding %00 and a fake extension to a jar: URL changed the interpretation of the contents

Reporter
Surya Dev Singh
Impact
low
Description

jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image.

References

#CVE-2025-1937: Memory safety bugs fixed in Firefox 136, Thunderbird 136, Firefox ESR 115.21, Firefox ESR 128.8, and Thunderbird 128.8

Reporter
the Mozilla Fuzzing Team, Andrew McCreight
Impact
high
Description

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. 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.

References

#CVE-2025-1938: Memory safety bugs fixed in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8

Reporter
Julien Wajsberg, the Mozilla Fuzzing Team
Impact
high
Description

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. 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.

References

#CVE-2025-1943: Memory safety bugs fixed in Firefox 136 and Thunderbird 136

Reporter
the Mozilla Fuzzing Team, Andrew McCreight, Sebastian Hengst, Randell Jesup
Impact
high
Description

Memory safety bugs present in Firefox 135 and Thunderbird 135. 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.

References