CVE-2026-12330

Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2029326	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-58/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-59/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-61/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::esr:::*

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) Condiciones de contorno incorrectas en el componente de internacionalización. Esta vulnerabilidad fue corregida en Firefox ESR 140.12, Firefox ESR 115.37 y Thunderbird 140.12.

Information

Published : 2026-06-16 13:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-12330

Mitre link : CVE-2026-12330

CVE.ORG link : CVE-2026-12330

JSON object : View

Products Affected

mozilla

firefox
thunderbird

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

{"id": "CVE-2026-12330", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12330", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-16T15:09:18.818466Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@mozilla.org", "affectedData": [{"vendor": "Mozilla", "product": "Firefox", "versions": [{"status": "unaffected", "version": "115.37", "versionType": "rpm", "lessThanOrEqual": "115.*"}, {"status": "unaffected", "version": "140.12", "versionType": "rpm", "lessThanOrEqual": "*"}]}, {"vendor": "Mozilla", "product": "Thunderbird", "versions": [{"status": "unaffected", "version": "140.12", "versionType": "rpm", "lessThanOrEqual": "*"}]}]}], "published": "2026-06-16T13:16:33.747", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2029326", "tags": ["Permissions Required"], "source": "security@mozilla.org"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-58/", "tags": ["Vendor Advisory"], "source": "security@mozilla.org"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-59/", "tags": ["Vendor Advisory"], "source": "security@mozilla.org"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-61/", "tags": ["Vendor Advisory"], "source": "security@mozilla.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-119"}]}], "descriptions": [{"lang": "en", "value": "Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12."}, {"lang": "es", "value": "Condiciones de contorno incorrectas en el componente de internacionalizaci\u00f3n. Esta vulnerabilidad fue corregida en Firefox ESR 140.12, Firefox ESR 115.37 y Thunderbird 140.12."}], "lastModified": "2026-10-26T12:10:00.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "vulnerable": true, "matchCriteriaId": "60E86F4A-420C-4F69-8081-79D1F64411C7", "versionEndExcluding": "115.37.0"}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "vulnerable": true, "matchCriteriaId": "E539846C-B1B9-41D9-A589-F46AEF0BFCD6", "versionEndExcluding": "140.12.0", "versionStartIncluding": "140.0"}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "vulnerable": true, "matchCriteriaId": "8CDF58C2-CD62-4DAB-9B1C-B48CE10FB31C", "versionEndExcluding": "140.12.0", "versionStartIncluding": "140.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@mozilla.org"}