{"id":"CVE-2026-110249","title":"A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours","summary":"A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability …","severity":"medium","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:30:29.797","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-110249","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2077826","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110249.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-110249"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550754"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-110249"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110249"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/#CVE-2026-110249"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"ingestedAt":"2026-10-13T19:43:28.944Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9"],"cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"vendor","cwe":["CWE-770"],"epss":0.0018,"epssPercentile":0.0748,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-20T17:01:59.034534Z"},"scores":{"vendor":3.4,"adp":8.6},"slug":"CVE-2026-110249","body":"## Overview\n\nA malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110249.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":220105,"id":"CVE-2026-110249","ts":1791978545443,"field":"cvss","old":null,"new":"5.3"},{"seq":220104,"id":"CVE-2026-110249","ts":1791978545443,"field":"severity","old":"none","new":"medium"}]}