CVE-2026-5732

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{"bugzilla": {"description": "firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics: Text component", "id": "2455908", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455908"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nIncorrect boundary conditions, integer overflow in the Graphics: Text component"], "name": "CVE-2026-5732", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/thunderbird-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-07T12:43:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5732\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5732\nhttps://www.mozilla.org/security/advisories/mfsa2026-27/#CVE-2026-5732\nhttps://www.mozilla.org/security/advisories/mfsa2026-29/#CVE-2026-5732"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,149.0.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,140.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox ESR", "source": "cna", "vendor": "Mozilla"}, "product": "firefox_esr", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,149.0.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,140.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-13T16:08:01.852284+00:00", "value": {"mitigation_remediation": ["Apply the latest Firefox update (149.0.2 or newer) or the ESR update (140.9.1 or newer).", "Apply the latest Thunderbird update (149.0.2 or newer) or the ESR update (140.9.1 or newer).", "If updates cannot be applied immediately, avoid rendering untrusted text content in affected browsers or mail clients until a patch is available."], "summary": {"action": "Patch Now", "impact": "Potential for arbitrary code execution through a graphics rendering flaw"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Mozilla Firefox, including the main and ESR releases, as well as Mozilla Thunderbird. The affected versions are those prior to Firefox 149.0.2 and Firefox ESR 140.9.1, and prior to Thunderbird 149.0.2 and Thunderbird 140.9.1. Users running older releases of these browsers are at risk.", "description_and_impact": "An integer overflow in the Graphics: Text component allows an attacker to supply crafted content that can corrupt memory during text rendering. This flaw can lead to the execution of arbitrary code or cause the application to crash, denying service. The weakness is a classic integer overflow (CWE\u2011190) affecting how the bounds of a text buffer are calculated, potentially creating a vulnerability where the code runs with the privileges of the application.", "risk_and_exploitability": "The CVSS score of 8.8 indicates high severity, and the EPSS score of less than 1% suggests a low current exploitation probability. The vulnerability is not listed in the CISA KEV catalog. Likely exploitation would involve an attacker delivering malicious content\u2014such as a specially crafted webpage or mail\u2014rendered by the affected browser or mail client, triggering the integer overflow during text drawing. Without official exploitation evidence, the exact attack vector is inferred based on the component description."}}}}, "created": "2026-04-08T19:38:06.197668+00:00", "updated": "2026-04-14T16:41:03.306064+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}