# mitmproxy v12.2.2 — mitmproxy 12.2.2

- Product: mitmproxy (https://whatsnew.fyi/product/mitmproxy)
- Vendor: mitmproxy
- Date: 2026-04-12
- Version: v12.2.2
- Original notes: https://github.com/mitmproxy/mitmproxy/releases/tag/v12.2.2
- Permalink: https://whatsnew.fyi/product/mitmproxy/releases/v12.2.2
- Labels: Platforms: Desktop

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **security** — Fix LDAP injection vulnerability
- **changed** — Reduce CERT_EXPIRY to 199 days
- **changed** — Switch all content-encoding compression algorithms to use fastest settings by default, significantly improving addon runtime performance when assigning to message.content
- **fixed** — Fix addon options not being included in --options output
- **fixed** — Fix view.settings.setval.toggle command to correctly use the provided key parameter instead of hardcoded "key" string
- **fixed** — Fix 400 Bad Request for HTTP requests with uppercase scheme
- **fixed** — Fix console command panel losing focus due to incoming traffic
- **fixed** — Fix failed CONNECT requests not being displayed in mitmdump
- **changed** — Reduce mitmweb FlowTable Redux subscriptions from O(rows) to O(1)
- **fixed** — Fix mitmweb editors not allowing content to be cleared to an empty string
- **changed** — Update optmanager value parsing exceptions to include the option name
- **changed** — Show intercept filter tag at the bottom for default options in mitmweb
- **fixed** — Fix mitmweb showing a blank page on Windows
- **changed** — Add number of selected flows in the mitmweb footer
- **fixed** — Fix modify_body crash when replacement strings contain backslash sequences
- **added** — Support adding and editing comments on individual flows in the mitmproxy console
- **added** — Allow hiding the Quick Help UI in the mitmproxy console with the 'H' key
- **removed** — Remove several dead functions

- [GHSA-527g-3w9m-29hv](https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hv):
  Fix LDAP injection vulnerability reported by @yueyueL.
  ([#8178](https://github.com/mitmproxy/mitmproxy/pull/8178), @mhils)
- Reduce `CERT_EXPIRY` to 199 days.
  ([#8142](https://github.com/mitmproxy/mitmproxy/pull/8142), @opstic)
- Switch all content-encoding compression algorithms to use fastest settings by default.
  This significantly improves addon runtime performance when assigning to `message.content`.
  ([#8055](https://github.com/mitmproxy/mitmproxy/pull/8055), @Prinzhorn)
- Fix addon options not being included in `--options` output.
  ([#4423](https://github.com/mitmproxy/mitmproxy/issues/4423), @emanuele-em)
- Fix `view.settings.setval.toggle` command to correctly use the provided key parameter instead of hardcoded "key" string.
  ([#8167](https://github.com/mitmproxy/mitmproxy/pull/8167), @nameearly)
- Fix 400 Bad Request for HTTP requests with uppercase scheme (e.g. `HTTP://`).
  ([#8174](https://github.com/mitmproxy/mitmproxy/pull/8174), @emanuele-em)
- Fix console command panel losing focus due to incoming traffic (e.g. websocket messages).
  ([#8173](https://github.com/mitmproxy/mitmproxy/pull/8173), @emanuele-em)
- mitmdump: Fix failed CONNECT requests not being displayed.
  ([#7083](https://github.com/mitmproxy/mitmproxy/issues/7083), @Prinzhorn)
- mitmweb: Reduce FlowTable Redux subscriptions from O(rows) to O(1).
  ([#8104](https://github.com/mitmproxy/mitmproxy/pull/8104), @ariel42)
- mitmweb: Fix editors not allowing content to be cleared to an empty string
  ([#8149](https://github.com/mitmproxy/mitmproxy/pull/8149), @ariel42)
- Update optmanager value parsing exceptions to include the option name
  ([#8016](https://github.com/mitmproxy/mitmproxy/pull/8016), @zdwg42)
- mitmweb: show intercept filter tag at the bottom for default options
  ([#8026](https://github.com/mitmproxy/mitmproxy/pull/8026), @xBZZZZ)
- Fix a bug where mitmweb would show a blank page on Windows.
  ([#8041](https://github.com/mitmproxy/mitmproxy/pull/8041), @Prinzhorn)
- mitmweb: Add number of selected flows in the footer
  ([#8057](https://github.com/mitmproxy/mitmproxy/pull/8057), @skrattara)
- Fix `modify_body` crash when replacement strings contain backslash sequences.
  ([#8046](https://github.com/mitmproxy/mitmproxy/pull/8046), @HueCodes)
- Added support for adding and editing comments on individual flows in the mitmproxy console.
  ([#7944](https://github.com/mitmproxy/mitmproxy/pull/7944), @lups2000)
- Allow hiding the Quick Help UI in the mitmproxy console with the 'H' key.
  ([#8095](https://github.com/mitmproxy/mitmproxy/pull/8095), @seroperson)
- Removed several dead functions using [Skylos](https://github.com/duriantaco/skylos).
  ([#8136](https://github.com/mitmproxy/mitmproxy/pull/8136), @duriantaco)