CVE-2025-14327VulnerabilityPublished 9 Feb 2026Updated 13 Oct 2026

Red Hat Security Advisory: thunderbird security update

Affects Red Hat thunderbirdSource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2025-14327· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat thunderbird to 140.8.0 soon.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 140.8.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat thunderbird to 140.8.0.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=140.7.0 <140.8.0 SUSE aarch64 MozillaThunderbird-140.8.1-bp160.1.1.aarch64 MozillaThunderbird-openpgp-librnp-140.8.1-bp160.1.1.aarch64 MozillaThunderbird-translations-common-140.8.1-bp160.1.1.aarch64 Red Hat Red Hat Enterprise Linux Red Hat Enterprise Linux AppStream (v. 8) src thunderbird-0:140.7.0-1.el8_10.src	Fixed in 140.8.0

AI-suggested

An official security update is available from Red Hat for Thunderbird and Firefox packages in Red Hat Enterprise Linux 8. Users should apply the update to Thunderbird ESR 140.7 (and related Firefox ESR versions) as provided in advisory RHSA-2026:2220. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.

Description

This update for MozillaThunderbird fixes the following issues: Changes in MozillaThunderbird: - Mozilla Thunderbird 140.8.1 ESR * Add mail.openpgp.load_untested_gpgme_version to load untested GPGME version - Mozilla Thunderbird 140.8.0 ESR MFSA 2026-17 (boo#1258568) * CVE-2026-2757 (bmo#2001637) Incorrect boundary conditions in the WebRTC: Audio/Video component * CVE-2026-2758 (bmo#2009608) Use-after-free in the JavaScript: GC component * CVE-2026-2759 (bmo#2010933) Incorrect boundary conditions in the Graphics: ImageLib component * CVE-2026-2760 (bmo#2011062) Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component * CVE-2026-2761 (bmo#2011063) Sandbox escape in the Graphics: WebRender component * CVE-2026-2762 (bmo#2011649) Integer overflow in the JavaScript: Standard Library component * CVE-2026-2763 (bmo#2012018) Use-after-free in the JavaScript Engine component * CVE-2026-2764 (bmo#2012608) JIT miscompilation, use-after-free in the JavaScript Engine: JIT component * CVE-2026-2765 (bmo#2013562) Use-after-free in the JavaScript Engine component * CVE-2026-2766 (bmo#2013583) Use-after-free in the JavaScript Engine: JIT component * CVE-2026-2767 (bmo#2013741) Use-after-free in the JavaScript: WebAssembly component * CVE-2026-2768 (bmo#2014101) Sandbox escape in the Storage: IndexedDB component * CVE-2026-2769 (bmo#2014550) Use-after-free in the Storage: IndexedDB component * CVE-2026-2770 (bmo#2014585) Use-after-free in the DOM: Bindings (WebIDL) component * CVE-2026-2771 (bmo#2014593) Undefined behavior in the DOM: Core & HTML component * CVE-2026-2772 (bmo#2014827) Use-after-free in the Audio/Video: Playback component * CVE-2026-2773 (bmo#2014832) Incorrect boundary conditions in the Web Audio component * CVE-2026-2774 (bmo#2014883) Integer overflow in the Audio/Video component * CVE-2026-2775 (bmo#2015199) Mitigation bypass in the DOM: HTML Parser component * CVE-2026-2776 (bmo#2015266) Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software * CVE-2026-2777 (bmo#2015305) Privilege escalation in the Messaging System component * CVE-2026-2778 (bmo#2016358) Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component * CVE-2026-2779 (bmo#1164141) Incorrect boundary conditions in the Networking: JAR component * CVE-2026-2780 (bmo#2007829) Privilege escalation in the Netmonitor component * CVE-2026-2781 (bmo#2009552) Integer overflow in the Libraries component in NSS * CVE-2026-2782 (bmo#2010743) Privilege escalation in the Netmonitor component * CVE-2026-2783 (bmo#2010943) Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component * CVE-2026-2784 (bmo#2012984) Mitigation bypass in the DOM: Security component * CVE-2026-2785 (bmo#2013549) Invalid pointer in the JavaScript Engine component * CVE-2026-2786 (bmo#2013612) Use-after-free in the JavaScript Engine component * CVE-2026-2787 (bmo#2014560) Use-after-free in the DOM: Window and Location component * CVE-2026-2788 (bmo#2014824) Incorrect boundary conditions in the Audio/Video: GMP component * CVE-2026-2789 (bmo#2015179) Use-after-free in the Graphics: ImageLib component * CVE-2026-2790 (bmo#2008426) Same-origin policy bypass in the Networking: JAR component * CVE-2026-2791 (bmo#2015220) Mitigation bypass in the Networking: Cache component * CVE-2026-2792 (bmo#2008912, bmo#2010050, bmo#2010275, bmo#2012331) Memory safety bugs fixed in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 * CVE-2026-2793 (bmo#2015196, bmo#2016423, bmo#2016498) Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 - Mozilla Thunderbird 140.7.2 ESR MFSA 2026-11 (boo#1258231) * CVE-2026-2447 (bmo#2014390) Heap buffer overflow in libvpx - Mozilla Thunderbird 140.7.1 ESR MFSA 2026-08 (bsc#1257397) * CVE-2026-0818 (bmo#1881530) CSS-based exfiltration of the content from partially encrypted emails when allowing remote content - Support using system GnuPG with gpgme 2, boo#1253718 - Mozilla Thunderbird 140.7.0 ESR MFSA 2026-05 (bsc#1256340) * CVE-2026-0877 (bmo#1999257) Mitigation bypass in the DOM: Security component * CVE-2026-0878 (bmo#2003989) Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component * CVE-2026-0879 (bmo#2004602) Sandbox escape due to incorrect boundary conditions in the Graphics component * CVE-2026-0880 (bmo#2005014) Sandbox escape due to integer overflow in the Graphics component * CVE-2026-0882 (bmo#1924125) Use-after-free in the IPC component * CVE-2025-14327

Impact

The vulnerabilities collectively could allow an attacker to perform spoofing, bypass security mitigations, cause use-after-free memory corruption, escape sandbox restrictions, disclose sensitive information, and conduct clickjacking attacks. These impacts may lead to unauthorized code execution, privilege escalation, or information leakage within affected Thunderbird and Firefox components. The severity is rated as high by Red Hat Product Security.

Summary

This Red Hat security advisory (RHSA-2026:2220) addresses 13 distinct vulnerabilities impacting Mozilla Thunderbird and Firefox components packaged with Red Hat Enterprise Linux 8. The vulnerabilities include spoofing (CVE-2025-14327, CVE-2026-0890), use-after-free bugs (CVE-2026-0885, CVE-2026-0882, CVE-2026-0884), memory safety bugs (CVE-2026-0891), sandbox escapes due to incorrect boundary conditions and integer overflow in graphics components (CVE-2026-0878, CVE-2026-0879, CVE-2026-0880, CVE-2026-0886), information disclosure (CVE-2026-0883, CVE-2026-0887), mitigation bypass (CVE-2026-0877), and clickjacking (CVE-2026-0887). These issues affect Thunderbird ESR 140.7, Thunderbird 147, Firefox ESR 140.7, and Firefox 147. The advisory provides updated packages for Red Hat Enterprise Linux 8 on multiple architectures. No known exploits in the wild have been reported at the time of this advisory.

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Affected software

Description

AI analysisMachine-generated, updated 15 Jul 2026, 14:46 UTC

Technical details

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