Bump undici, @nomicfoundation/hardhat-toolbox and hardhat

[dependabot]

Bumps undici to 6.28.0 and updates ancestor dependencies undici, @nomicfoundation/hardhat-toolbox and hardhat. These dependencies need to be updated together.

Updates undici from 5.29.0 to 6.28.0

Release notes

Sourced from undici's releases.

v6.28.0

⚠️ Security fixes

• GHSA-m8rv-5g2x-5cg5: a malicious type property on a duck-typed blob-like HTTP/1.1 request body could inject CRLF sequences into the generated content-type header. Undici now coerces and validates the value before adding it to the request. Fixed by 740a0b7c.
• GHSA-8xcm-r25x-g524: the retry interceptor could expose a stale Content-Length after resuming a partial response, potentially causing downstream response desynchronization, hangs, or corruption. Undici now rejects partial responses whose Content-Length is inconsistent with Content-Range. Fixed by cba3a52a, with corrected fixtures in 4fd5a0c6.
• GHSA-v3r7-h72x-cjcm: unsanitized domain and unparsed values passed to setCookie() could inject cookie attributes. Undici now validates cookie domains, paths, and unparsed attributes more strictly. Fixed by af748404.

GHSA-4cwx-7wf7-3272 and GHSA-jr45-8vmc-qm54 affect the cache interceptor in Undici v7 and v8; Undici v6 is not in their affected version ranges.

Full Changelog: nodejs/undici@v6.27.0...v6.28.0

v6.27.0

⚠️ Security Release

This release line addresses 4 security advisories.

Action required: Upgrade to undici 6.27.0 or later.

npm install undici@^6.27.0

Note on patched version: the v6 fixes shipped in v6.27.0, not 6.26.0 — v6.26.0 contains only the chunked-EOF fix (#5308) and the version bump, none of the security fixes below.

The v6 line is not affected by the SOCKS5 advisories (GHSA-vmh5-mc38-953g, GHSA-hm92-r4w5-c3mj), the shared-cache disclosure (GHSA-pr7r-676h-xcf6), or the 8.x-only WebSocket regression (GHSA-38rv-x7px-6hhq).

Summary

Advisory	CVE	Severity (CVSS)	Fixed in	Fix commit
GHSA-vxpw-j846-p89q	CVE-2026-12151	High (7.5)	6.27.0	b7f252e7
GHSA-p88m-4jfj-68fv	CVE-2026-9679	Moderate (5.9)	6.27.0	25efa447
GHSA-g8m3-5g58-fq7m	CVE-2026-11525	Low (3.7)	6.27.0	25efa447
GHSA-35p6-xmwp-9g52	CVE-2026-6733	Low (3.7)	6.27.0	f4c31d60

---

High severity

WebSocket DoS via fragment count bypass — CVE-2026-12151

GHSA-vxpw-j846-p89q · CWE-400, CWE-770 Fix: b7f252e7 Backport WebSocket maxPayloadSize fixes (#5423, backported to v6 in #5428)

A malicious WebSocket server can stream a large number of small or empty continuation frames. Undici enforced a limit on cumulative payload size but did

... (truncated)

Commits

• 01a912e Bumped v6.28.0 (#5591)
• 481ecfc Use Node 22 and npm 11 to release
• 740a0b7 fix: validate blob body content type
• 2698e49 fix: validate coerced header values for CRLF (#5579)
• 4fd5a0c test(retry): correct broken content-range fixtures in retry-handler.js
• cba3a52 fix(retry): reject partial content length mismatch
• af74840 fix: harden cookie domain, path, and unparsed attribute validation
• 551138c Bumped v6.27.0 (#5431)
• b7f252e Backport WebSocket maxPayloadSize fixes to v7.x (#5423) (#5428)
• 25efa44 fix(cookies): preserve values and parse SameSite strictly
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by GitHub Actions, a new releaser for undici since your current version.

Install script changes

This version modifies prepare script that runs during installation. Review the package contents before updating.

Updates @nomicfoundation/hardhat-toolbox from 4.0.0 to 7.0.0

Release notes

Sourced from @​nomicfoundation/hardhat-toolbox's releases.

@​nomicfoundation/hardhat-toolbox-viem@​5.0.7

Changes

• #8339 00720e8 Thanks @​alcuadrado! - The plugin now uses definePlugin from hardhat/plugins in its index.ts, so it participates in Hardhat's new "imported but unused plugin" warning when omitted from a project's plugins array.

• Updated dependencies:

  • hardhat@3.8.0

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

@​nomicfoundation/hardhat-toolbox-viem@​5.0.6

Changes

• #8264 8452f97 Thanks @​alcuadrado! - Export ./package.json so consumers can import the package's manifest.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

@​nomicfoundation/hardhat-toolbox-viem@​5.0.5

Changes

• #8191 2a4ae8e Thanks @​alcuadrado! - Update how type extensions are handled to optimize the bootstrap process of Hardhat.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

Changelog

Sourced from @​nomicfoundation/hardhat-toolbox's changelog.

7.0.0

Major Changes

• 09ae6db: Deprecate the latest npm tag and redirect users to migrate to Hardhat 3 or to the hh2 tag.

Commits

• 6372d08 Version Packages
• a26e822 Remove the npm tags from the README.md files
• 18bef56 Quote the package in the installation instructions of the readmes
• e5025ae Update the formatting and quote the package in the installation instructions ...
• ee34347 Update hardhat-toolbox
• 7ade974 Version Packages
• a7e4215 feat: bump minimum version of solidity-coverage to Osaka
• e4ad0ad chore: update package metadata for provenance
• f65ee74 Version Packages
• a4f1e27 Hardhat 2 documentation links updated to reflect the domain change to v2.hard...
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by GitHub Actions, a new releaser for @​nomicfoundation/hardhat-toolbox since your current version.

Updates hardhat from 2.26.5 to 3.14.0

Release notes

Sourced from hardhat's releases.

Hardhat v3.14.0

This is a small bug fix release, but includes a reworking of our EDR dependencies to be platform specific, reducing the install size of a Hardhat project's node_modules.

Changes

• #8540 99306ea Thanks @​kanej! - EDR now uses platform specific optionalDependencies, reducing Hardhat's install size.

• #8514 f7c6228 Thanks @​questfever! - Fixed Solidity resolver containment checks for paths whose names share a prefix with the project root, a package source-name root, or node_modules.

• #8540 99306ea Thanks @​kanej! - Fixed missing Solidity test stack trace when setUp() fails and stack traces are collected with CollectStackTraces::Always.

• #8500 54973b2 Thanks @​SnowingFox! - Fixed the format of fuzz test counterexamples: byte array values such as calldata, sender and address are now printed as hexadecimal strings (e.g. 0x3e2033b3...) instead of comma-separated byte lists.

• #8522 8640b4b Thanks @​JasonColapietro! - Remove Holesky testnet (chain id 17000) as a supported chain as it has been shut down.

• #8488 edd1069 Thanks @​ChristopherDedominici! - Stores gas snapshot cheatcode values as raw strings and calculates diffs using BigInt.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

Hardhat v3.13.0

This release adds two new features: a --tolerance option for --snapshot-check to allow for a small amount of drift between gas snapshots as you develop and default values for config variables in hardhat.config.ts, see the config docs for more details.

Changes

• #8453 38b9f2d Thanks @​ChristopherDedominici! - Add a fallback value for configVariable.

• #8487 7b7af19 Thanks @​ChristopherDedominici! - Added a --tolerance option to --snapshot-check in Solidity tests, allowing snapshot values to drift by a given percentage before the check fails.

• #8486 2ccd059 Thanks @​Kropiunig! - Fixed the EDR network config validation rejecting mining.interval: 0, a valid value which disables interval mining.

• #8490 22667f6 Thanks @​kanej! - Added detection and custom error for failed native binding loads (HHE27) of @nomicfoundation/edr or @nomicfoundation/solidity-analyzer.

• #8454 47793de Thanks @​ChristopherDedominici! - Only collect Solidity test stack traces at verbosity level 5 (-vvvvv) and above, fixing excessive memory usage when running large test suites with -vvv/-vvvv.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

Hardhat v3.12.0

This release includes two new features: negative test filtering with the --grep-exclude flag for both Solidity tests and Mocha test suite, and experimental Amsterdam "EIP-7843: SLOTNUM" support, see our Amsterdam support guide.

Changes

• #8442 4904c72 Thanks @​ChristopherDedominici! - Support test name filter negation (--grep-exclude) for Solidity and Mocha tests.

• #8472 2a66c2e Added experimental EIP-7843 support to the Amsterdam hardfork: blocks now include the slotNumber header field, and the SLOTNUM (0x4b) opcode returns it. EDR has no consensus layer, so the value is simulated: it increments by one per mined block, starting at 0 on a new chain, or from the forked block's slot number when forking.

• #8464 b2b69f7 Thanks @​nishant-uxs! - Prefer environment variables over configurationVariables hooks when resolving config vars.

• #8474 49cc2f0 Thanks @​Wodann! - Report chain type to Google Analytics

... (truncated)

Changelog

Sourced from hardhat's changelog.

3.14.0

Minor Changes

• #8540 99306ea Thanks @​kanej! - EDR now uses platform specific optionalDependencies, reducing Hardhat's install size.

Patch Changes

• #8514 f7c6228 Thanks @​questfever! - Fixed Solidity resolver containment checks for paths whose names share a prefix with the project root, a package source-name root, or node_modules.

• #8540 99306ea Thanks @​kanej! - Fixed missing Solidity test stack trace when setUp() fails and stack traces are collected with CollectStackTraces::Always.

• #8500 54973b2 Thanks @​SnowingFox! - Fixed the format of fuzz test counterexamples: byte array values such as calldata, sender and address are now printed as hexadecimal strings (e.g. 0x3e2033b3...) instead of comma-separated byte lists.

• #8522 8640b4b Thanks @​JasonColapietro! - Remove Holesky testnet (chain id 17000) as a supported chain as it has been shut down.

• #8488 edd1069 Thanks @​ChristopherDedominici! - Stores gas snapshot cheatcode values as raw strings and calculates diffs using BigInt.

3.13.0

Minor Changes

• #8453 38b9f2d Thanks @​ChristopherDedominici! - Add a fallback value for configVariable.

• #8487 7b7af19 Thanks @​ChristopherDedominici! - Added a --tolerance option to --snapshot-check in Solidity tests, allowing snapshot values to drift by a given percentage before the check fails.

Patch Changes

• #8486 2ccd059 Thanks @​Kropiunig! - Fixed the EDR network config validation rejecting mining.interval: 0, a valid value which disables interval mining.

• #8490 22667f6 Thanks @​kanej! - Added detection and custom error for failed native binding loads (HHE27) of @nomicfoundation/edr or @nomicfoundation/solidity-analyzer.

• #8454 47793de Thanks @​ChristopherDedominici! - Only collect Solidity test stack traces at verbosity level 5 (-vvvvv) and above, fixing excessive memory usage when running large test suites with -vvv/-vvvv.

3.12.0

Minor Changes

• #8442 4904c72 Thanks @​ChristopherDedominici! - Support test name filter negation (--grep-exclude) for Solidity and Mocha tests.

• #8472 2a66c2e Thanks @​kanej! - Added experimental EIP-7843 support to the Amsterdam hardfork: blocks now include the slotNumber header field, and the SLOTNUM (0x4b) opcode returns it. EDR has no consensus layer, so the value is simulated: it increments by one per mined block, starting at 0 on a new chain, or from the forked block's slot number when forking.

Patch Changes

• #8464 b2b69f7 Thanks @​nishant-uxs! - Prefer environment variables over configurationVariables hooks when resolving config vars.

• #8474 49cc2f0 Thanks @​Wodann! - Report chain type to Google Analytics

• #8458 0c60e08 Thanks @​schaable! - Fixed project initialization so that compilation and build output directories are never copied from a template into a new project.

... (truncated)

Commits

• e829113 Version Packages
• eedceb5 Merge pull request #8488 from NomicFoundation/fix-non-numeric-snapshot-diff
• 90cdf9e build: upgrade EDR to v0.17.0
• be8e931 fix copilot comment
• 06a354b fix copilot comment
• bcf8fb1 Merge branch 'main' of github.com:NomicFoundation/hardhat into fix-non-numeri...
• d8a2606 build: upgrade to @nomicfoundation/edr 0.16.0
• d84ce51 chore: bump eslint 9.25.1 → 9.39.5
• 1ae803f Merge pull request #8514 from questfever/main
• ec7a14d Merge pull request #8500 from SnowingFox/fix/fuzz-counterexample-hex
• Additional commits viewable in compare view

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