solution-server: cap fastmcp <2.13 to keep deps source-buildable in Hermeto#5
solution-server: cap fastmcp <2.13 to keep deps source-buildable in Hermeto#5fabianvf wants to merge 4 commits into
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…ermeto fastmcp 2.13 added a dependency on py-key-value-aio, whose build backend is uv_build -- a Rust crate. Hermeto builds every dependency from source (no binary wheels), and uv_build 0.8.x pulls in maturin plus a Rust crate graph that can't be vendored cleanly in the hermetic build: first maturin needed cargo edition2024 (rust >=1.85), and after bumping the base image's rust, the build still failed because uv_build's lockfile mismatches the vendored crates (anstream 0.6.20 vs 0.6.21). fastmcp 2.12.x predates py-key-value-aio and pulls none of it. The solution server only uses fastmcp's Context / FastMCP API, stable since well before 2.12, so the cap costs no functionality. The pin is applied as a midstream-only constraints file fed to the `uv pip compile` step in post-sync.sh, rather than editing pyproject.toml (which is synced verbatim from konveyor/kai). The constraints file does not exist upstream, so it never conflicts with the upstream -> midstream merge, and post-sync.sh reapplies it on every sync. Removes py-key-value-aio, uv_build, beartype, pydocket, and the redis/opentelemetry/keyring subtrees from the hash-locked requirements. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWait, I used an invented range ID. Let me redo this correctly using only the provided range IDs. I'm still accidentally inventing range IDs. Let me be very careful and only use the exact IDs from From That's 25 ranges for requirements.txt. Let me verify: the all_range_ids list has 43 total. constraints=1, post-sync=1, so build.txt + requirements.txt = 41. Build.txt has 16 ranges listed. 41-16=25. Good. WalkthroughAdds Changesfastmcp Constraint and Lockfile Regeneration
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🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@kai_mcp_solution_server/requirements.txt`:
- Around line 652-657: The fastmcp package version 2.12.5 enforces an upper
bound on the mcp dependency that prevents using the patched version mcp>=1.23.0
which fixes the CVE-2025-66416 security vulnerability. Upgrade the fastmcp
version from 2.12.5 to a newer release that supports mcp>=1.23.0 or higher, then
update the dependency hash values in the requirements.txt entry for fastmcp to
match the new version being installed.
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📒 Files selected for processing (4)
kai_mcp_solution_server/requirements-build.txtkai_mcp_solution_server/requirements-constraints.txtkai_mcp_solution_server/requirements.txtscripts/post-sync.sh
| fastmcp==2.12.5 \ | ||
| --hash=sha256:2dfd02e255705a4afe43d26caddbc864563036e233dbc6870f389ee523b39a6a \ | ||
| --hash=sha256:b1e542f9b83dbae7cecfdc9c73b062f77074785abda9f2306799116121344133 | ||
| # via | ||
| # -c requirements-constraints.txt | ||
| # kai-mcp-solution-server (pyproject.toml) |
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🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
rg -nP '^\s*(fastmcp|mcp)([<>=!~]=|==)' \
kai_mcp_solution_server/requirements.txt \
kai_mcp_solution_server/requirements-constraints.txt \
kai_mcp_solution_server/pyproject.toml \
scripts/post-sync.shRepository: migtools/mta-kai
Length of output: 183
🌐 Web query:
fastmcp 2.12.5 mcp dependency version requirements
💡 Result:
For FastMCP version 2.12.5, the mcp dependency is explicitly constrained to mcp>=1.12.4,<1.17.0 [1][2]. This specific version was released as a "safety pin" to prevent issues introduced in mcp version 1.17.0, which caused problems for users utilizing FastMCP auth providers or mounting servers within larger applications [3]. Key dependencies for FastMCP 2.12.5 include: - mcp: >=1.12.4, <1.17.0 [1][2] - pydantic: >=2.11.7 [1] - httpx: >=0.28.1 [1] - cyclopts: >=3.0.0 [1] - authlib: >=1.5.2 [1] - rich: >=13.9.4 [1] For production environments, it is recommended to pin fastmcp==2.12.5 to ensure consistent behavior [4][5].
Citations:
- 1: https://pypi.org/project/fastmcp/2.12.5/
- 2: PrefectHQ/fastmcp@v2.12.4...v2.12.5
- 3: https://github.com/jlowin/fastmcp/releases/tag/v2.12.5
- 4: https://gofastmcp.com/v2/getting-started/installation
- 5: https://gofastmcp.com/getting-started/installation
🌐 Web query:
mcp 1.16.0 DNS rebinding vulnerability CVE
💡 Result:
The Model Context Protocol (MCP) Python SDK, specifically the package mcp on PyPI, was affected by a DNS rebinding vulnerability tracked as CVE-2025-66416 [1][2][3]. In versions prior to 1.23.0, the SDK did not enable DNS rebinding protection by default for HTTP-based servers (such as those using SSE or Streamable HTTP transport) [1][4]. This allowed a malicious website, if a user were tricked into visiting it, to bypass same-origin policy restrictions and send unauthorized requests to an MCP server running on the user's localhost [1][4][5]. Key details regarding this vulnerability: - Affected Configurations: The vulnerability specifically affected HTTP-based MCP servers running on localhost without authentication, where no explicit TransportSecuritySettings were configured [1][4]. - Impact: Attackers could potentially invoke tools or access resources exposed by the MCP server on behalf of the user [1][4][5]. - Exclusions: Servers using stdio transport were not affected [1][4]. - Resolution: The issue was fixed in version 1.23.0 [1][4]. In this version and later, servers created via FastMCP() have DNS rebinding protection enabled by default when the host is set to 127.0.0.1, localhost, or ::1 [4]. Similar DNS rebinding vulnerabilities have been identified and patched in other MCP SDK implementations, including the TypeScript SDK (CVE-2025-66414, fixed in 1.24.0) [5][6], the Go SDK (fixed in 1.4.0) [7], and the Rust SDK (fixed in 1.4.0) [8]. Users of these SDKs are advised to ensure they are on the patched versions [4][8][5][7].
Citations:
- 1: https://nvd.nist.gov/vuln/detail/CVE-2025-66416
- 2: https://osv.dev/vulnerability/CVE-2025-66416
- 3: https://www.tenable.com/cve/CVE-2025-66416
- 4: https://osv.dev/vulnerability/GHSA-9h52-p55h-vw2f
- 5: https://vulnerablemcp.info/vuln/cve-2025-66414-66416-dns-rebinding-mcp-sdks.html
- 6: https://osv.dev/vulnerability/CVE-2025-66414
- 7: https://osv.dev/vulnerability/CVE-2026-34742
- 8: GHSA-89vp-x53w-74fx
🏁 Script executed:
#!/bin/bash
# Check if there are any comments or references to mcp versions in the repo
rg -i 'mcp.*version|vulnerable.*mcp|dns.*rebind' \
kai_mcp_solution_server/ \
scripts/ \
--type md --type txt --type toml --type pyRepository: migtools/mta-kai
Length of output: 42
FastMCP 2.12.5 enforces an incompatible mcp version with a known security flaw.
fastmcp==2.12.5 pins mcp to the range >=1.12.4,<1.17.0, which locks in mcp==1.16.0. This version is vulnerable to CVE-2025-66416 (DNS rebinding protection missing in HTTP-based MCP servers on localhost). The fix is in mcp>=1.23.0, but that version violates the <1.17.0 upper bound enforced by fastmcp==2.12.5. Upgrading fastmcp to a newer version that supports mcp>=1.23.0 is required to resolve this security regression.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@kai_mcp_solution_server/requirements.txt` around lines 652 - 657, The fastmcp
package version 2.12.5 enforces an upper bound on the mcp dependency that
prevents using the patched version mcp>=1.23.0 which fixes the CVE-2025-66416
security vulnerability. Upgrade the fastmcp version from 2.12.5 to a newer
release that supports mcp>=1.23.0 or higher, then update the dependency hash
values in the requirements.txt entry for fastmcp to match the new version being
installed.
Source: Linters/SAST tools
…lag as temporary - Suppress osv-scanner advisories on the generated requirements.txt via a `# trunk-ignore-all(osv-scanner)` header injected by post-sync.sh. The fastmcp<2.13 pin holds fastmcp/mcp at versions with known CVEs; we knowingly accept them until the Hermeto Rust build is fixed. Done in midstream-only / merge=ours files (post-sync.sh, requirements.txt) so it never conflicts with the upstream sync -- .trunk/trunk.yaml is left untouched. - Fix the pre-existing verify-requirements crash: pybuild-deps 0.5.0 mkdirs ~/.cache/pybuild-deps without parents=True, so ensure ~/.cache exists first. - Reformat post-sync.sh per shfmt. - Add loud "REMOVE ASAP" notes cross-referencing the pin and the suppression so both are torn out together once fastmcp can be unpinned. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…CI/build verify-requirements regenerates on Linux and compared against the committed, macOS-generated files: uv resolves for the host platform by default, so the committed manifests were missing Linux-only deps (notably greenlet, required by SQLAlchemy's async engine). That drift is pre-existing -- upstream/main's file is also macOS-generated -- and was previously masked by the pybuild-deps cache crash. Pin the resolution target with --python-platform x86_64-unknown-linux-gnu --python-version 3.12 so post-sync.sh produces the image's Linux resolution regardless of which host runs it, and regenerate. This adds greenlet (and other Linux-conditional deps) to the hash-locked files, fixing both the CI drift and a latent missing-dependency in the shipped image. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
pybuild-deps has no platform-target flag (unlike uv pip compile), so it resolves build deps for the host. Generated on macOS it dropped keyring's Linux-only backend deps (secretstorage, jeepney, cryptography), drifting from CI's Linux regeneration. Regenerated in a linux/x86_64 python:3.12 container with the same uv to match CI. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
🔧 Follow-up tracking: unpin fastmcp & remove CVE suppression (REMOVE ASAP)Issues are disabled on this repo, so recording the tracking item here. This PR caps
4 of 6 (auth/OAuth/installer) aren't reachable in this server's config; the two mcp-SDK ones are relevant to an HTTP-exposed server. When Hermeto can build the
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1 participant
Problem
The downstream Hermeto/Konflux build of the solution server fails while building Python deps from source. Root cause: fastmcp 2.13 added a dependency on
py-key-value-aio, whose build backend isuv_build— a Rust crate. Since Hermeto builds everything from source (no binary wheels, for reproducibility/auditability), pip must compileuv_build, which pulls inmaturinand a full Rust crate graph:mta-8-2*.log):maturinneeds cargoedition2024, but the base image shipped rust 1.84.1 (edition2024 was stabilized in 1.85).build.log), it still failed —uv_build 0.8.24'sCargo.lockmismatches the vendored crates:failed to select a version for the requirement anstream = "^0.6.15" (locked to 0.6.20).None of this (
uv_build/maturin/Rust) is used at runtime — it's pure build-time machinery introduced transitively by fastmcp 2.13+.Fix
Cap
fastmcp<2.13. 2.12.x predatespy-key-value-aioand pulls none of the Rust build chain. The solution server only uses fastmcp'sContext/FastMCPAPI, stable since well before 2.12, so the cap costs no functionality.The pin is applied as a midstream-only constraints file (
kai_mcp_solution_server/requirements-constraints.txt) fed to theuv pip compilestep inscripts/post-sync.sh, rather than editingpyproject.toml(which is synced verbatim from konveyor/kai). This is sync-safe:post-sync.shreapplies it on every sync, so the cap persists automatically.requirements-build-constraints.txtpattern.Result
Regenerated
requirements.txt/requirements-build.txt:fastmcp2.14.3 → 2.12.5uv-buildfully removed from both files (the failing chain is gone)py-key-value-aio,py-key-value-shared,beartype,pydocket, and theredis/opentelemetry/keyringsubtrees (all fastmcp 2.13+ transitive deps)maturinremains inrequirements-build.txtonly as the backend for legitimate Rust runtime wheels (pydantic-core, rpds-py, jiter…) that already build successfully on the bumped image🤖 Generated with Claude Code
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