CVE-2026-2801

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{"bugzilla": {"description": "firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component", "id": "2442289", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442289"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "details": ["Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148 and Thunderbird < 148."], "name": "CVE-2026-2801", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/thunderbird-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-24T13:33:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2801\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2801\nhttps://www.mozilla.org/security/advisories/mfsa2026-13/#CVE-2026-2801\nhttps://www.mozilla.org/security/advisories/mfsa2026-16/#CVE-2026-2801"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,148)"}}], "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": "generic", "value": "[0,148)"}}], "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": "2026-04-15T16:03:53.852531+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox and Thunderbird to version\u00a0148 or later to receive the fix.", "Until the upgrade can be applied, disable WebAssembly in the affected browsers; for Firefox set the about:config preference \\\"javascript.options.wasm\\\" to false, and use enterprise policy to disable the feature.", "Monitor browser activity for unexpected WebAssembly module loading and keep browsers up to date with the latest security patches from Mozilla."], "summary": {"action": "Apply patch", "impact": "Potential memory corruption that may allow code execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird are affected. Versions before 148 of each browser contain the vulnerability; any installation of these products on Windows, macOS, Linux, or mobile platforms that predates the fix is vulnerable.", "description_and_impact": "Incorrect boundary conditions were found in the JavaScript: WebAssembly component. The flaw causes the component to miscalculate array lengths or memory limits, which could corrupt memory. This corruption can in theory lead to arbitrary code execution, denial of service, or instability within the affected process. The description does not detail the full range of consequences, so the impact is limited to what is known about such boundary errors.", "risk_and_exploitability": "The CVSS base score of 7.5 indicates a high severity condition. The EPSS score is reported as less than 1\u202f%, suggesting that real\u2011world exploitation is unlikely at the moment. The vulnerability is not listed in the CISA KEV catalog. The description does not specify a precise attack vector; it is inferred that triggering the flaw would require a malicious WebAssembly module, but this inference is not confirmed by the official data."}}}}, "created": "2026-02-25T11:39:09.952029+00:00", "updated": "2026-04-15T17:00:07.092345+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$thunderbird"]}