CVE-2026-2781

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{"bugzilla": {"description": "firefox: Integer overflow in the Libraries component in NSS", "id": "2442292", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442292"}, "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": ["No description is available for this CVE."], "name": "CVE-2026-2781", "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": "2026-02-24T13:33:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2781\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2781\nhttps://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2781"], "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": "[0,140.8)"}}], "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": "2026-04-22T03:42:49.622168+00:00", "value": {"mitigation_remediation": ["Upgrade to Firefox 148 or later, or Firefox ESR 140.8 or later, to receive the NSS security fix.", "Upgrade to Thunderbird 148 or later, or Thunderbird ESR 140.8 or later, to apply the same patch.", "If upgrading immediately is not possible, monitor for official workarounds; avoid using applications that rely on the vulnerable NSS component until a patch is available."], "summary": {"action": "Apply Patch", "impact": "Potential Integrity Violation"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions prior to 148 and Firefox ESR 140.8, as well as Mozilla Thunderbird versions prior to 148 and Thunderbird ESR 140.8, all use the vulnerable NSS library. Updated releases contain the fix and are therefore unaffected.", "description_and_impact": "An integer overflow exists in the Libraries component of NSS, which can corrupt memory or lead to unintended behavior. This weakness is classified as CWE\u2011190, indicating that improper handling of arithmetic operations may allow an attacker to influence program flow or data. The description does not confirm a remote code execution, but the high severity suggests that successful exploitation could compromise integrity or allow privilege escalation within the affected application or system. The vulnerability has been fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.", "risk_and_exploitability": "The CVSS score of 8.8 classifies the issue as high severity, yet the EPSS score of less than 1% indicates a very low likelihood of real\u2011world exploitation at this time. The vulnerability is not listed in the CISA KEV catalogue. Based on the description, it is inferred that attackers would need to deliver malicious data that triggers the overflow via the affected NSS component, which is likely to occur in a client\u2011side scenario such as browsing or email processing. Because the impact can be severe if exploited, vigilance is warranted despite the low exploitation probability."}}}}, "created": "2026-02-25T11:39:28.770087+00:00", "updated": "2026-04-22T03:45:06.988150+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}