VulnerabilityPublished 15 Sep 2026Updated 23 Sep 2026

CVE-2026-92031: Mozjs52 · Information disclosure in the Graphics: ImageLib component

Affects mozjs52Source GCVE Database

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Authoritative record:CVE-2026-92031· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 3.1 base score

6.5Medium

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
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: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within 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 15 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

ghsa-542f-vpqh-r4pj

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 24.04 LTSmozjs102`pkg:deb/ubuntu/mozjs102?arch=source&distro=noble`Other threats	Affected =102.15.1-1 =102.15.1-3ubuntu2	Fixed in–
Ubuntu 24.04 LTSmozjs115`pkg:deb/ubuntu/mozjs115?arch=source&distro=noble`Other threats	Affected 115.3.0-0ubuntu1 – 115.10.0-1 9 affected builds	Fixed in–
Ubuntu 22.04 LTSmozjs102`pkg:deb/ubuntu/mozjs102?arch=source&distro=jammy`Other threats	Affected 102.11.0-0ubuntu0.22.04.1 – 102.15.1-0ubuntu0.22.04.1 4 affected builds	Fixed in–
Ubuntu 22.04 LTSmozjs78`pkg:deb/ubuntu/mozjs78?arch=source&distro=jammy`Other threats	Affected =78.13.0-1 =78.15.0-2 =78.15.0-4ubuntu1	Fixed in–
Ubuntu 22.04 LTSmozjs91`pkg:deb/ubuntu/mozjs91?arch=source&distro=jammy`Other threats	Affected 91.5.1-0ubuntu1 – 91.10.0-0ubuntu1 5 affected builds	Fixed in–
Ubuntu 22.04 LTSthunderbird`pkg:deb/ubuntu/thunderbird?arch=source&distro=jammy`Other threats	Affected 1:91.1.2+build1-0ubuntu1 – 1:140.7.1+build1-0ubuntu0.22.04.1 39 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been released in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3. Users and administrators should update to these or later versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2026-92031 is an information disclosure vulnerability in the Graphics: ImageLib component of mozjs52. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3. The CVSS score is 6.5, indicating a medium severity issue. The vulnerability allows unauthorized disclosure of information but does not impact integrity or availability. Multiple specific affected versions are identified, including various Ubuntu package versions. No known exploits in the wild have been reported.

Impact

The vulnerability allows unauthorized disclosure of sensitive information, which could aid attackers in further attacks or reconnaissance. There is no impact on system integrity or availability. The medium severity rating reflects the potential confidentiality impact without direct system compromise. No active exploitation has been reported.

Summary

CVE-2026-92031 is an information disclosure vulnerability affecting the Graphics: ImageLib component in mozjs52. It was addressed by Mozilla in Firefox 156 and corresponding ESR and Thunderbird versions. The vulnerability allows an attacker to gain access to sensitive information without requiring privileges or user interaction beyond triggering the flaw. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, and high confidentiality impact with no integrity or availability impact. The vendor advisory confirms the fix in Firefox 156 and related versions.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Sep 2026, 07:48 UTC

Technical details

References

Community reviews

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