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This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."}, {"lang": "es", "value": "Condiciones de contorno incorrectas en el componente Web Audio. Esta vulnerabilidad afecta a Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, y Thunderbird < 140.8."}], "id": "CVE-2026-2773", "lastModified": "2026-07-15T02:19:39.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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{"bugzilla": {"description": "firefox: Incorrect boundary conditions in the Web Audio component", "id": "2442319", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442319"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-2773", "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": "2026-02-24T13:33:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2773\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2773\nhttps://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2773"], "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": "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": "[0,115.33)"}}], "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": "[0,140.8)"}}], "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": "2026-04-15T15:32:59.495069+00:00", "value": {"mitigation_remediation": ["Apply Mozilla\u2019s official patch by upgrading to Firefox\u00a0148 or newer, or ESR\u00a0115.33/140.8, and upgrade Thunderbird to version\u00a0148 or newer, or ESR\u00a0140.8 or newer.", "If an immediate update is not possible, block or disable the Web Audio API through browser configuration (e.g., via about:config or policy) to prevent any scripts from creating AudioContext objects.", "Enforce a strict Content Security Policy that limits or disallows JavaScript that constructs audio contexts, and regularly review mail and web content handling settings to mitigate potential exploitation."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox users running any version prior to Firefox 148, including ESR builds older than versions 115.33 and 140.8, are impacted. Similarly, Thunderbird users on versions before Thunderbird\u00a0148, including ESR builds older than 140.8, are at risk.", "description_and_impact": "The flaw arises from incorrect boundary handling in the Web Audio component, creating a buffer over-read/write that can crash the browser or enable arbitrary code execution. This boundary error is catalogued as CWE-119 and can be leveraged by a malicious web page or email containing a crafted AudioContext to corrupt memory or trigger an exploit. As a result, an attacker could compromise the confidentiality, integrity, and availability of the affected system.", "risk_and_exploitability": "With a CVSS score of 9.8 the vulnerability is classified as critical, yet the EPSS score of less than 1% indicates a low likelihood of exploitation at this time. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities catalog. The likely attack vector is inferred to be a user accessing a malicious web page or opening a crafted email that exploits the Web Audio API; an attacker must first entice a vulnerable user to load the content. No mitigations are documented beyond remediation by an update, so the exposure persists until the affected products receive a patch or the component is disabled."}}}}, "created": "2026-02-25T11:39:35.264620+00:00", "updated": "2026-04-15T17:15:10.572212+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}