thunderbird: A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing...
CVE-2026-110249 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-110249, released October 21, 2026. It is not reported as exploited. Patch Radar priority: High.
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 was fixed in Thunderbird 158 and Thunderbird 153.5.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| MozillaThunderbird · sles 15.7 | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 | Nov 7, 2026 |
| thunderbird · Debian 12.15 (bookworm) | 1:153.5.1esr-1~deb12u1 | DEBIAN-CVE-2026-110249 | Oct 21, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:153.5.1esr-1~deb13u1 | DEBIAN-CVE-2026-110249 | Oct 21, 2026 |
| thunderbird · Debian 14 | 1:153.5.0esr-1 | DEBIAN-CVE-2026-110249 | Oct 21, 2026 |
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