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🌮 TACO DAO Neuron

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HashEra

Change the set of elected GuestOS versions.

The version to elect (identified by the hash of the installation image) is added to the registry. Besides creating a record for that version, the proposal also appends that version to the list of elected versions that can be installed on nodes of a subnet.

Only elected GuestOS versions can be deployed.

Release Notes for [release-2026-09-18_03-28-base](https://github.com/dfinity/ic/tree/release-2026-09-18_03-28-base) (`2c2c7c99bd526d8c3da51df32aeeb977e852292d`)
This release is based on changes since [release-2026-09-10_03-28-base](https://dashboard.internetcomputer.org/release/dea4a9afe8bb2a6c324eb661e52204c6054d8e91) (`dea4a9afe8bb2a6c324eb661e52204c6054d8e91`).

Please note that some commits may be excluded from this release if they're not relevant, or not modifying the GuestOS image.
Additionally, descriptions of some changes might have been slightly modified to fit the release notes format.

To see a full list of commits added since last release, compare the revisions on [GitHub](https://github.com/dfinity/ic/compare/release-2026-09-10_03-28-base...release-2026-09-18_03-28-base).
## Features:
* [`9f34f23ba`](https://github.com/dfinity/ic/commit/9f34f23ba) Core Protocol: `CertifiedSlicePool::classify_advert()` ([#11601](https://github.com/dfinity/ic/pull/11601))
* [`2788b2b1b`](https://github.com/dfinity/ic/commit/2788b2b1b) Core Protocol: Export million_round_instructions_total in subnet_metrics ([#11587](https://github.com/dfinity/ic/pull/11587))
* [`a868b86f9`](https://github.com/dfinity/ic/commit/a868b86f9) Core Protocol: Don't gossip HTTPS outcalls responses that were already delivered ([#11546](https://github.com/dfinity/ic/pull/11546))
* [`6b6729b97`](https://github.com/dfinity/ic/commit/6b6729b97) Core Protocol: `CertifiedSlicePool`: highest seen peer headers ([#11545](https://github.com/dfinity/ic/pull/11545))
* [`4b629b496`](https://github.com/dfinity/ic/commit/4b629b496) Core Protocol: Backfill the canister-level monotonic consumed cycles ([#11490](https://github.com/dfinity/ic/pull/11490))
* [`e3dc82488`](https://github.com/dfinity/ic/commit/e3dc82488) Core Protocol: Strict XNet slice byte limits for suffix pulls ([#11536](https://github.com/dfinity/ic/pull/11536))
* [`50155e189`](https://github.com/dfinity/ic/commit/50155e189) Core Protocol: bump base64 ([#11487](https://github.com/dfinity/ic/pull/11487))
* [`554dfeadc`](https://github.com/dfinity/ic/commit/554dfeadc) Node: Refactor VSOCK ([#11322](https://github.com/dfinity/ic/pull/11322))
* [`6b75723f5`](https://github.com/dfinity/ic/commit/6b75723f5) Node: Build fast upgrade images ([#11506](https://github.com/dfinity/ic/pull/11506))
* [`763d0e53c`](https://github.com/dfinity/ic/commit/763d0e53c) Node: Support SEV firmware upgrades ([#11476](https://github.com/dfinity/ic/pull/11476))
* [`b75c0e59d`](https://github.com/dfinity/ic/commit/b75c0e59d) Node: bump lru, axum-extra & mockito ([#11530](https://github.com/dfinity/ic/pull/11530))
## Bugfixes:
* [`20c396cc0`](https://github.com/dfinity/ic/commit/20c396cc0) Core Protocol(replay): don't execute the replay target height as a checkpoint round ([#11203](https://github.com/dfinity/ic/pull/11203))
* [`e5b09f332`](https://github.com/dfinity/ic/commit/e5b09f332) Core Protocol: remove the ordering on CompoundCycles ([#11529](https://github.com/dfinity/ic/pull/11529))
* [`d8891e834`](https://github.com/dfinity/ic/commit/d8891e834) Node: some minor issues in `ic-boundary` ([#11563](https://github.com/dfinity/ic/pull/11563))
## Performance improvements:
* [`d60c570ae`](https://github.com/dfinity/ic/commit/d60c570ae) Core Protocol(dkg): iterate over less entries, stop cloning and simplify DKG pool purging ([#11492](https://github.com/dfinity/ic/pull/11492))
## Chores:
* [`1155b1c20`](https://github.com/dfinity/ic/commit/1155b1c20) Core Protocol: Add a metric counting HTTP outcalls submitted in the replicated state ([#11584](https://github.com/dfinity/ic/pull/11584))
* [`2e1f80121`](https://github.com/dfinity/ic/commit/2e1f80121) Core Protocol: bump ic-gateway & ic-bn-lib ([#11574](https://github.com/dfinity/ic/pull/11574))
* [`49395cfcc`](https://github.com/dfinity/ic/commit/49395cfcc) Core Protocol: Bump current certification version to V29 ([#11184](https://github.com/dfinity/ic/pull/11184))
* [`df047c055`](https://github.com/dfinity/ic/commit/df047c055) Core Protocol: rustc: 1.97.1 -> 1.98.1 ([#11534](https://github.com/dfinity/ic/pull/11534))
* [`6a7e0a3ef`](https://github.com/dfinity/ic/commit/6a7e0a3ef) Core Protocol,Node: cargo clippy fixes to prepare for the rustc upgrade: 1.97.1 -> 1.98.1 ([#11533](https://github.com/dfinity/ic/pull/11533))
* [`b1d1529d6`](https://github.com/dfinity/ic/commit/b1d1529d6) Node: Update Base Image Refs [2026-09-17-0806] ([#11598](https://github.com/dfinity/ic/pull/11598))
* [`b888ef401`](https://github.com/dfinity/ic/commit/b888ef401) Node: Update Base Image Refs [2026-09-16-0133] ([#11583](https://github.com/dfinity/ic/pull/11583))
* [`605a5396f`](https://github.com/dfinity/ic/commit/605a5396f) Node: Update Base Image Refs [2026-09-11-0131] ([#11539](https://github.com/dfinity/ic/pull/11539))
## Refactoring:
* [`dfecf2225`](https://github.com/dfinity/ic/commit/dfecf2225) Core Protocol: unify CUP verification and add some sanity checks ([#11556](https://github.com/dfinity/ic/pull/11556))
* [`9980b493f`](https://github.com/dfinity/ic/commit/9980b493f) Core Protocol: `ExpectedIndices::covered_header_begin` ([#11580](https://github.com/dfinity/ic/pull/11580))
* [`70b58ec08`](https://github.com/dfinity/ic/commit/70b58ec08) Core Protocol(recovery): prepare the recovery library for a subnet merging tool ([#11570](https://github.com/dfinity/ic/pull/11570))
* [`adc10687c`](https://github.com/dfinity/ic/commit/adc10687c) Core Protocol(recovery): move the reusable parts of subnet splitting into a crate of their own ([#11553](https://github.com/dfinity/ic/pull/11553))
## Tests:
* [`f746fe558`](https://github.com/dfinity/ic/commit/f746fe558) Core Protocol: Add pay-as-you-go HTTPS outcalls system tests ([#11327](https://github.com/dfinity/ic/pull/11327))
## Documentation:
Full list of changes (including the ones that are not relevant to GuestOS) can be found on [GitHub](https://github.com/dfinity/dre/blob/00dd5821a947eedd72754f4715dfbd4a582a8b6f/replica-releases/2c2c7c99bd526d8c3da51df32aeeb977e852292d.md).

# IC-OS Verification

To build and verify the IC-OS GuestOS disk image, after installing curl if necessary (`sudo apt install curl`), run:

```
# From https://github.com/dfinity/ic#verifying-releases
curl -fsSL https://raw.githubusercontent.com/dfinity/ic/2c2c7c99bd526d8c3da51df32aeeb977e852292d/ci/scripts/repro-check | python3 - -c 2c2c7c99bd526d8c3da51df32aeeb977e852292d --guestos
```

The two SHA256 sums printed above from a) the downloaded CDN image and b) the locally built image, must be identical, and must match the SHA256 from the payload of the NNS proposal.

While not required for this NNS proposal, as we are only electing a new GuestOS version here, you have the option to verify the build reproducibility of the HostOS by passing `--hostos` to the script above instead of `--guestos`, or the SetupOS by passing `--setupos`.


Elect new IC/GuestOS revision (commit 2c2c7c9)