Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.

Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.

Mozilla: iframe sandbox rules did not apply to XSLT stylesheets Mozilla: Use-after-free in file picker dialog Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain thunderbird: Memory corruption when processing S/MIME messages Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3 Mozilla: Use-after-free in HTTP2 Session object

Mozilla: iframe sandbox rules did not apply to XSLT stylesheets Mozilla: Use-after-free in file picker dialog Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain thunderbird: Memory corruption when processing S/MIME messages Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3 Mozilla: Use-after-free in HTTP2 Session object

Affected: Ubuntu:18.04:LTS: thunderbird, Ubuntu:20.04:LTS: thunderbird

Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.