Tor Browser 11.5.8 backports the following security updates from Firefox ESR 102.5 to to Firefox ESR 91.13 on Windows, macOS and Linux:

• CVE-2022-43680: In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
• CVE-2022-45403: Service Workers might have learned size of cross-origin media files
• CVE-2022-45404: Fullscreen notification bypass
• CVE-2022-45405: Use-after-free in InputStream implementation
• CVE-2022-45406: Use-after-free of a JavaScript Realm
• CVE-2022-45408: Fullscreen notification bypass via windowName
• CVE-2022-45409: Use-after-free in Garbage Collection
• CVE-2022-45410: ServiceWorker-intercepted requests bypassed SameSite cookie policy
• CVE-2022-45411: Cross-Site Tracing was possible via non-standard override headers
• CVE-2022-45412: Symlinks may resolve to partially uninitialized buffers
• CVE-2022-45416: Keystroke Side-Channel Leakage
• CVE-2022-45420: Iframe contents could be rendered outside the iframe
• CVE-2022-45421: Memory safety bugs fixed in Firefox 107 and Firefox ESR 102.5

Tor Browser 11.5.8 updates GeckoView on Android to Firefox ESR 102.5 and includes important security updates. Tor Browser 11.5.8 backports the following security updates from Firefox 107 to Firefox ESR 102.5 on Android:

• CVE-2022-45413: SameSite=Strict cookies could have been sent cross-site via intent URLs

The full changelog since Tor Browser 11.5.7 is:

• All Platforms
  • Update Translations
  • Update OpenSSL to 1.1.1s
  • Update NoScript to 11.4.12
  • Update tor to 0.4.7.11
  • Update zlib to 1.2.13
  • Bug tor-browser-build#40622: Update obfs4proxy to 0.0.14 in Tor Browser
• Windows + macOS + Linux
  • Bug tor-browser#31064: Letterboxing is enabled in priviledged contexts too
  • Bug tor-browser#32411: Consider adding about:tor and others to the list of pages that do not need letterboxing
  • Bug tor-browser#41413: Backup intl.locale.requested in 11.5.x
  • Bug tor-browser#41434: Letterboxing bypass through secondary tab (popup/popunder...)
  • Bug tor-browser#41456: Backport ESR 102.5 security fixes to 91.13-based Tor Browser
  • Bug tor-browser#41460: Migrate new identity and security level preferences in 11.5.8
  • Bug tor-browser#41463: Backport fix for CVE-2022-43680
• Android
  • Update GeckoView to 102.5.0esr
  • Bug tor-browser#41461: Backport Android-specific 107-rr security fixes to 102.5-esr based Geckoview
• Build
  • All Platforms
    • Update Go to 1.18.8
    • Bug tor-browser-build#40658: Create an anticensorship team keyring
    • Bug tor-browser-build#40690: Revert fix for zlib build break