Mozilla Foundation Security Advisory 2025-18

Security Vulnerabilities fixed in Thunderbird ESR 128.8

Announced
March 4, 2025
Impact
critical
Products
Thunderbird
Fixed in
  • Thunderbird 128.8

In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.

#CVE-2024-43097: Overflow when growing an SkRegion's RunArray

Reporter
Google Android
Impact
critical
Description

In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow

References

#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-2025-1931: 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-2025-1934: 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-2025-1935: 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