CVE-2026-2791

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{"bugzilla": {"description": "firefox: Mitigation bypass in the Networking: Cache component", "id": "2442342", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442342"}, "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": ["No description is available for this CVE."], "name": "CVE-2026-2791", "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:6", "fix_state": "Out of support scope", "package_name": "firefox", "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:8", "fix_state": "Affected", "package_name": "firefox", "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"}], "public_date": "2026-02-24T13:33:22Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2791\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2791\nhttps://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2791"], "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": "[0,140.8)"}}], "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": "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"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.8)"}}], "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": "2026-04-15T16:06:33.369318+00:00", "value": {"mitigation_remediation": ["Upgrade to Firefox 148 or later, or to the ESR 140.8 release or newer, and similarly update Thunderbird to 148 or later, or its ESR 140.8 branch.", "Configure automated updates or a consistent patch\u2011deployment pipeline to ensure the fixed releases are installed promptly.", "If an upgrade is not immediately available, consult Mozilla\u2019s support or security advisories for guidance on temporary mitigations."], "summary": {"action": "Immediate Patch", "impact": "Bypass of Network Cache Mitigations"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Thunderbird are affected in all releases prior to Firefox 148 and Firefox ESR 140.8, and prior to Thunderbird 148 and Thunderbird ESR 140.8, respectively. Versions newer than those contain the patch and are not impacted.", "description_and_impact": "The flaw in the Networking: Cache component allows an attacker to circumvent safeguards that control the caching of web resources, potentially exposing cached data or manipulating request handling. This bypass can lead to confidentiality breaches, integrity violations, or denial\u2011of\u2011service conditions if attackers force malformed or repeated cache requests. The weakness is categorized as CWE\u2011288, pointing to a failure in limiting the impact of a denial\u2011of\u2011service attack.", "risk_and_exploitability": "The CVSS score of 9.8 indicates a critical severity, while the EPSS score of less than 1% suggests a low probability of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, implying no public exploits are known. The attack vector is not explicitly provided in the data; it is inferred to be remote, likely involving network traffic that the browser or client processes, such as malicious web content or tailored HTTP requests."}}}}, "created": "2026-02-25T11:39:20.185161+00:00", "updated": "2026-04-15T17:15:10.551170+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}