Fedora 41 update for thunderbird

1) Unintended Proxy or Intermediary

EUVDB-ID: #VU102424

Risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0237

CWE-ID: CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to WebChannel API does not check the sending principal but rather accepted the principal being sent when transporting data across processes. A local user can perform confused deputy attack and escalate privileges on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU102422

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0238

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when breaking lines in text. A remote attacker can trick the victim into visiting a specially crafted webpage and execute arbitrary code on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Improper Certificate Validation

EUVDB-ID: #VU102425

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0239

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to Alt-Svc ALPN does not properly validate certificates when the original server is redirecting to an insecure site. A remote attacker can perform MitM attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Use-after-free

EUVDB-ID: #VU102426

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0240

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when parsing a JavaScript module as JSON. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Buffer overflow

EUVDB-ID: #VU102427

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0241

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Buffer overflow

EUVDB-ID: #VU102423

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0242

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

7) Buffer overflow

EUVDB-ID: #VU102428

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-0243

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 41

thunderbird: before 128.6.0-1.fc41

CPE2.3

External links

http://bodhi.fedoraproject.org/updates/FEDORA-2025-2f5b9ab47b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	High
Patch available	YES
Number of vulnerabilities	7
CVE-ID	CVE-2025-0237 CVE-2025-0238 CVE-2025-0239 CVE-2025-0240 CVE-2025-0241 CVE-2025-0242 CVE-2025-0243
CWE-ID	CWE-441 CWE-416 CWE-295 CWE-119
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Fedora Operating systems & Components / Operating system thunderbird Operating systems & Components / Operating system package or component
Vendor	Fedoraproject