go.mod: bump the most-deps group with 6 updates

[dependabot]

Bumps the most-deps group with 6 updates:

Package	From	To
github.com/modelcontextprotocol/go-sdk	1.7.0	1.8.0
golang.org/x/crypto	0.55.0	0.57.0
golang.org/x/term	0.45.0	0.46.0
golang.org/x/text	0.41.0	0.42.0
golang.org/x/time	0.15.0	0.16.0
mvdan.cc/sh/v3	3.14.0	3.14.1

Updates github.com/modelcontextprotocol/go-sdk from 1.7.0 to 1.8.0

Release notes

Sourced from github.com/modelcontextprotocol/go-sdk's releases.

v1.8.0

This release is equivalent to v1.8.0-pre.2. Thank you to those who tested the pre-release.

In this release we introduce several fixes and improvements on top of v1.7.0. It adds no new protocol revision: the supported set is unchanged, and 2026-07-28 remains the newest version the SDK negotiates.

The bulk of the work is hardening the transports against resource exhaustion, closing session leaks, deadlocks and teardown hangs found by users running the new protocol at scale, and giving servers explicit control over which protocol versions they advertise.

Two behavior changes are guarded by new MCPGODEBUG flags; see the section below.

Hardening against resource exhaustion

Every decoding path that buffers incoming input is now bounded. JSON payloads are rejected past 1000 levels of nesting, before the parser recurses. Both SSE readers cap the bytes buffered for a single event via MaxEventSize on SSEClientTransport and StreamableClientTransport, and the stdio transport caps a single JSON-RPC frame via StdioTransport.MaxLineLength.

On the OAuth side, dynamic client registration responses are bounded to 1 MB, and the discovery code now validates metadata documents rather than trusting them.

• internal/json: json nesting depth check by @​yarolegovich (#1200)
• mcp: add an sse event size cap by @​yarolegovich (#1205)
• mcp: add a max request body size of the old transport by @​yarolegovich (#1224)
• oauthex: bound dcr read to 1mb by @​yarolegovich (#1206)
• oauthex: oauth discovery checks by @​yarolegovich (#1220)

Restricting the protocol versions a server supports

ServerOptions.SupportedProtocolVersions lets a server narrow the set of versions it advertises and negotiates. The list can only narrow, never widen; naming a version the SDK does not implement panics at construction. Relatedly, a stateful streamable handler receiving a 2026-07-28 request now returns that same JSON-RPC error instead of a plain-text 400, so the client can renegotiate down instead of losing the connection.

• mcp: allow restricting the protocol versions a server supports by @​guglielmo-san (#1199)
• mcp: return json-rpc error on stateful server serving protocolVersion20260728 requests by @​guglielmo-san (#1143)
• mcp: limit SSE discover supportedVersions to SSE-defined revisions by @​arimu1 (#1121)
• mcp: prefer the negotiated protocol version over the request context by @​gwyszynski-sa (#1163)
• mcp: export ClientSessionOptions.ProtocolVersion by @​arimu1 (#1127)

Per-request cache control

ServerOptions.SetCacheable is a new hook that decides the ttlMs and cacheScope fields of every result carrying them: server/discover, the four list methods, and resources/read. It runs once per result, after the handler returns, with the values that handler produced, so it can set a policy globally while still letting an individual handler override it. Anything left unset falls back to the protocol default of public.

• mcp: allow per request Cacheable customization by @​guglielmo-san (#1203)

Behavior changes guarded by MCPGODEBUG

Two new escape-hatch flags restore the previous behavior of the changes above. Both will be removed in v1.9.0.

• plaintextstatefulrejection=1 — restore the plain-text http.Error 400 body a stateful StreamableHTTPHandler previously returned for a request carrying per-request metadata. The default is now a JSON-RPC -32022 CodeUnsupportedProtocolVersion error with an UnsupportedProtocolVersionData payload advertising the legacy versions the server supports. Introduced by #1143.
• blockingcancelnotify=1 — restore the previous behavior where a cancelled call waits synchronously for notifications/cancelled to be delivered (up to 5s) before returning, joining any delivery error into the caller's error. The default now retires the call immediately and sends the notification asynchronously. Introduced by #1151.

Options below were removed, according to plan:

• seterroroverwrite
• enableoriginverification
• disablecontenttypecheck

... (truncated)

Commits

• 3f3b699 refactor: remove legacy MCPGODEBUG compatibility for new protocol release (#1...
• 830f0b7 mcp: update conformance tests (#1231)
• 12cbafe oauthex: oauth discovery checks (#1220)
• 3632967 mcp: add an sse event size cap (#1205)
• 0d3036f mcp: allow per request Cacheable customization (#1203)
• cb0de64 mcp: add a max request body size of the old transport (#1224)
• 2fdabde mcp: do not check metatada on notifications (#1215)
• 59185e6 build(deps): bump ossf/scorecard-action from 2.4.3 to 2.4.4 (#1217)
• a6764cf build(deps): bump golang/govulncheck-action from 1.0.4 to 1.1.0 (#1218)
• 8227246 fix: only subscribe when server advertises capability (#1221)
• Additional commits viewable in compare view

Updates golang.org/x/crypto from 0.55.0 to 0.57.0

Commits

• 3f62bf1 go.mod: update golang.org/x dependencies
• 86efde5 ssh: reject unexpected message types on established channels
• a6cdac6 ssh: drop traffic on undecided channels
• 39dc44e ssh: don't skip the source-address critical option in CheckCert
• afebf4c x509roots/fallback/bundle: make subjectsEqual stricter on Go 1.27+
• 89f4e9b x509roots/fallback: update bundle
• 71488c4 ssh/knownhosts: compare only public key portions for revocation
• 82adefa ssh: synchronize unexpected response test
• c757c98 all: upgrade go directive to at least 1.26.0 [generated]
• 593c81a ssh: correctly ignore pre-banner lines
• Additional commits viewable in compare view

Updates golang.org/x/term from 0.45.0 to 0.46.0

Commits

• 6226200 go.mod: update golang.org/x dependencies
• 7c2fb74 term: process bytes returned with a read error
• 3963fce all: upgrade go directive to at least 1.26.0 [generated]
• See full diff in compare view

Updates golang.org/x/text from 0.41.0 to 0.42.0

Commits

• fafe4a0 go.mod: update golang.org/x dependencies
• f53c316 unicode/norm: don't truncate runes in the recomposition map key
• 37867f6 unicode/norm: let any starter block composition in compose
• 0dd525f unicode/norm: compose non-Hangul runes after a Hangul syllable
• bac26e5 unicode/norm: avoid improper ErrShortDst return in Form.transform
• 4f55186 unicode/norm: simplify short source detection in Form.transform
• a1b6c10 unicode/norm: prevent decomposeSegment from moving backwards
• cd1cbc9 unicode/bidi: panic rather than log.Panicf
• a459614 internal/export/idna: fix conformance with optional validation disabled
• be70a61 internal/export/idna: drop trie field from Profiles
• Additional commits viewable in compare view

Updates golang.org/x/time from 0.15.0 to 0.16.0

Commits

• fb013b3 all: upgrade go directive to at least 1.26.0 [generated]
• See full diff in compare view

Updates mvdan.cc/sh/v3 from 3.14.0 to 3.14.1

Release notes

Sourced from mvdan.cc/sh/v3's releases.

v3.14.1

• syntax
  • Fix the indentation of heredocs nested inside command substitutions - #1403
  • Keep literal tabs in <<- heredoc bodies rather than replacing them with spaces
  • Don't indent heredocs without dashes nested in <<- ones, whose output no longer parsed
  • Zsh: don't drop the prefix in short forms like $#"$foo" and $+"$foo" - #1405
• interp
  • Fix the build on 32-bit FreeBSD and NetBSD
• expand
  • Don't let escaped characters such as \* act as glob metacharacters
• pattern
  • Treat unclosed extended operator groups like @(a as literals, avoiding a panic

Consider becoming a sponsor if you benefit from the work that went into this release!

Binaries built on go version go1.27.1 linux/amd64 with:

CGO_ENABLED=0 go build -trimpath -ldflags="-w -s"

Changelog

Sourced from mvdan.cc/sh/v3's changelog.

[3.14.1] - 2026-09-06

• syntax
  • Fix the indentation of heredocs nested inside command substitutions - #1403
  • Keep literal tabs in <<- heredoc bodies rather than replacing them with spaces
  • Don't indent heredocs without dashes nested in <<- ones, whose output no longer parsed
  • Zsh: don't drop the prefix in short forms like $#"$foo" and $+"$foo" - #1405
• interp
  • Fix the build on 32-bit FreeBSD and NetBSD
• expand
  • Don't let escaped characters such as \* act as glob metacharacters
• pattern
  • Treat unclosed extended operator groups like @(a as literals, avoiding a panic

Commits

• a3f0c75 CHANGELOG: add entry for v3.14.1
• 29855f3 interp: stop confirming a huge brace sequence against bash
• 39a9394 expand: keep escaped characters from acting as glob metacharacters
• a89e798 expand: add test cases for globbing with escaped metacharacters
• 755b3e5 pattern: treat unclosed extended operator groups as literals
• 63af908 fix: gitAtime build fail on 32-bit FreeBSD and NetBSD
• 671a5e2 syntax: count columns for bytes written via colCounter.Write
• 7c82969 syntax: don't indent heredocs without dashes nested in <<- ones
• 075feed syntax: keep literal tabs in <<- heredoc bodies intact
• 466c5e8 syntax: add test cases for literal tabs in <<- heredoc bodies
• Additional commits viewable in compare view

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