CVE-2026-113869

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{"affected": [{"affectedData": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "153.*", "status": "unaffected", "version": "153.6", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "158.0.1", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message load could finish or be cancelled while the prompt was open. This freed the message decoder while it was still in use, causing a use-after-free and a potentially exploitable crash. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.6."}], "id": "CVE-2026-113869", "lastModified": "2026-10-27T19:17:10.433", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-113869", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-20T19:42:14.775611Z", "version": "2.0.3"}}]}, "published": "2026-10-20T20:17:19.860", "references": [{"source": "security@mozilla.org", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2075530"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-114/"}, {"source": "security@mozilla.org", "url": "https://www.mozilla.org/security/advisories/mfsa2026-122/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "thunderbird: thunderbird: Use-after-free via S/MIME decryption password prompt", "id": "2556402", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556402"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in Thunderbird. When requesting a security device password, such as a smartcard PIN or Primary Password, while decrypting a Secure/Multipurpose Internet Mail Extensions (S/MIME) message, the message loading process can finish or be canceled while the prompt remains open. This premature termination frees the message decoder while it is still in use, resulting in a use-after-free memory error. An attacker could exploit this vulnerability to cause an application crash, leading to a Denial of Service (DoS), or potentially execute arbitrary code."], "mitigation": {"lang": "en:us", "value": "--- CME Mitigation Guidance (2026-10-20) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\nThe highest-value action is to prevent premature deallocation of the S/MIME message decoder when message loading completes or is canceled while an interactive password prompt is open: upgrade to Thunderbird 158.0.1 (or the fixed Thunderbird builds), which prevents freeing the message decoder while it remains in use during active S/MIME security device password prompts, closing S/MIME encrypted message delivery triggering an interactive password prompt. Until patched, this is a concern on Thunderbird installations opening S/MIME encrypted messages across all supported platforms, so exercise caution when opening untrusted S/MIME messages and avoid canceling message load operations while smartcard PIN or Primary Password prompt dialogs are displayed. As a compensating measure, maintain Address Space Layout Randomization to randomize Thunderbird process memory and impede gadget predictability, deploy Endpoint Detection and Response agents to detect behavioral anomalies and post-exploitation activity, and enforce Non-Executable Memory (NX/XD bit) protections to block code execution from corrupted heap and data pages. These controls limit blast radius and contain exploitation, but they do not fix the underlying use-after-free defect \u2014 apply the upstream patch to fully remediate.\nHighest-impact CME: CME-101 ASLR (Address Space Layout Randomization) (medium)"}, "name": "CVE-2026-113869", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-20T19:14:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-113869\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-113869\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=2075530\nhttps://www.mozilla.org/security/advisories/mfsa2026-114/"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[158.0.1,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "created": "2026-10-20T20:45:14.112781+00:00", "updated": "2026-10-28T02:15:07.314923+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$thunderbird"], "weaknesses": ["CWE-416", "CWE-825"]}