CVE-2026-6746VulnerabilityPublished 7 May 2026

SUSE · Security update for MozillaThunderbird

Affects SUSESource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2026-6746· High 7.5

Not known to be exploited · CVSS 7.5 High · patch available : patch SUSE soon.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 3.1 base score

7.5High

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

Patch: Available

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

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

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: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 21 Apr 2026
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

Affected software

Product	Affected	Fixed in
SUSE Product Security Team SUSE	Affected <150	Fixed in 150

Description

This update for MozillaThunderbird fixes the following issues Updated to Mozilla Thunderbird 140.10.1: MFSA 2026-34 (bsc#1262230): - CVE-2026-6746: Use-after-free in the DOM: Core & HTML component. - CVE-2026-6747: Use-after-free in the WebRTC component. - CVE-2026-6748: Uninitialized memory in the Audio/Video: Web Codecs component. - CVE-2026-6749: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. - CVE-2026-6750: Privilege escalation in the Graphics: WebRender component. - CVE-2026-6751: Uninitialized memory in the Audio/Video: Web Codecs component. - CVE-2026-6752: Incorrect boundary conditions in the WebRTC component. - CVE-2026-6753: Incorrect boundary conditions in the WebRTC component. - CVE-2026-6754: Use-after-free in the JavaScript Engine component. - CVE-2026-6757: Invalid pointer in the JavaScript: WebAssembly component. - CVE-2026-6759: Use-after-free in the Widget: Cocoa component. - CVE-2026-6761: Privilege escalation in the Networking component. - CVE-2026-6762: Spoofing issue in the DOM: Core & HTML component. - CVE-2026-6763: Mitigation bypass in the File Handling component. - CVE-2026-6764: Incorrect boundary conditions in the DOM: Device Interfaces component. - CVE-2026-6765: Information disclosure in the Form Autofill component. - CVE-2026-6766: Incorrect boundary conditions in the Libraries component in NSS. - CVE-2026-6767: Other issue in the Libraries component in NSS. - CVE-2026-6769: Privilege escalation in the Debugger component. - CVE-2026-6770: Other issue in the Storage: IndexedDB component. - CVE-2026-6771: Mitigation bypass in the DOM: Security component. - CVE-2026-6772: Incorrect boundary conditions in the Libraries component in NSS. - CVE-2026-6776: Incorrect boundary conditions in the WebRTC: Networking component. - CVE-2026-6785: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150. - CVE-2026-6786: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150. MFSA 2026-39 (bsc#1263110): - CVE-2026-7320: Information disclosure due to incorrect boundary conditions in the Audio/Video component. - CVE-2026-7321: Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. - CVE-2026-7322: Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. - CVE-2026-7323: Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Other updates and bugfixes: - Fixed: Newly translated strings were not available in Thunderbird.

GCVE source: db.gcve.eu
Csaf Category: csaf_security_advisory
Csaf Version: 2.0
Publisher: SUSE Product Security Team
Advisory ID: SUSE-SU-2026:1741-1
Vendor Severity: high
CVE Count: 29
Additional Cves: CVE-2026-6747, CVE-2026-6748, CVE-2026-6749, CVE-2026-6750, CVE-2026-6751, CVE-2026-6752, CVE-2026-6753, CVE-2026-6754, CVE-2026-6757, CVE-2026-6759, CVE-2026-6761, CVE-2026-6762, CVE-2026-6763, CVE-2026-6764, CVE-2026-6765, CVE-2026-6766, CVE-2026-6767, CVE-2026-6769, CVE-2026-6770, CVE-2026-6771, CVE-2026-6772, CVE-2026-6776, CVE-2026-6785, CVE-2026-6786, CVE-2026-7320, CVE-2026-7321, CVE-2026-7322, CVE-2026-7323

References

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