CVE-2026-2806

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{"bugzilla": {"description": "firefox: thunderbird: Uninitialized memory in the Graphics: Text component", "id": "2442306", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442306"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N", "status": "draft"}, "details": ["Uninitialized memory in the Graphics: Text component. This vulnerability affects Firefox < 148 and Thunderbird < 148."], "name": "CVE-2026-2806", "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": "2026-02-24T13:33:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2806\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2806\nhttps://www.mozilla.org/security/advisories/mfsa2026-13/#CVE-2026-2806\nhttps://www.mozilla.org/security/advisories/mfsa2026-16/#CVE-2026-2806"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Low"}

{"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": "2026-04-15T16:02:28.278018+00:00", "value": {"mitigation_remediation": ["Update Firefox to version\u00a0148 or newer.", "Update Thunderbird to version\u00a0148 or newer.", "Verify that automatic updates are enabled and that no legacy extensions accessing the Graphics: Text component remain installed."], "summary": {"action": "Immediate Patch", "impact": "Data Leakage"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Thunderbird are affected by this flaw. All versions prior to Firefox 148 and Thunderbird 148 are vulnerable, as the issue was fixed in these releases. The advisory MFSA\u00a02026\u201113 and MFSA\u00a02026\u201116 reference the related bug (2006199).", "description_and_impact": "The vulnerability arises from uninitialized memory usage within the Graphics: Text component of Firefox and Thunderbird. This flaw can expose whatever garbage data happens to occupy the memory region, potentially leaking sensitive information or affecting the integrity of rendered content. The listed CWEs indicate that uninitialized variables and improper handling of input may allow exploitation. Depending on the environment, an attacker could manipulate rendered text to reveal internal data or cause unintended behavior.", "risk_and_exploitability": "The CVSS base score of 9.1 signifies a severe risk. The EPSS score of <1% indicates low but nonzero exploitation probability. The vulnerability is not listed in the KEV catalog. The likely attack vector is local or remote through the rendering of malicious content, as the flaw occurs within the Graphics: Text component. Exploitation would generally require the victim to load crafted text that triggers the use of the uninitialized memory."}}}}, "created": "2026-02-25T11:39:05.422970+00:00", "updated": "2026-04-15T17:00:07.087914+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$thunderbird"]}