Security: backport libssh2/attr/acl CVE fixes from Debian forky

[naomi-robusta]

Summary

Patches the runner-image CVEs that have a fix available, documents the ones that don't, and fixes the unrelated Pre-commit checks failure that has been red on master since 08-23.

The runner image is Debian trixie (python:3.11-slim). Every reported package was checked against the Debian security tracker and against the actually-built image, rather than against the scan report alone — two of the reported findings turned out to be already fixed on master.

Patched (9 CVEs)

Debian trixie ships no fix for any of these ("vulnerable, no DSA" in the tracker); the patched packages only exist in forky/testing.

Package	trixie	→	CVEs
libssh2-1t64	1.11.1-1+deb13u1	1.11.1-6	CVE-2026-58050, CVE-2026-58051, CVE-2026-66032, CVE-2026-66033, CVE-2026-66034, CVE-2026-66035
libattr1 (attr)	1:2.5.2-3	1:2.6.0-1	CVE-2026-54371
libacl1 (acl)	2.3.2-2+b1	2.4.0-1	CVE-2026-54369, CVE-2026-54370

The upgrades are deliberately narrow. libssh2 stays on upstream 1.11.1 — the -6 Debian revision only adds the CVE patches — and attr/acl move to the first upstream releases carrying their fixes.

Only those three packages can come from forky: they get an explicit per-package pin at priority 990, and every other forky package is pinned to -1, which makes it uninstallable. apt-get -t forky is deliberately not used — a target release raises every forky package to 990 and defeats a Package: * pin, so apt would resolve a dependency by pulling forky's libc6 (2.43) or libssl3t64 into the runtime image. With the negative pin, trixie stays the only source for everything else, and an unsatisfiable dependency is an apt error instead. The testing sources are removed again in the same layer, so the shipped image has no testing repository configured.

libssh2 arrives via libcurl, which git and curl depend on; libattr1/libacl1 are coreutils dependencies. None of the three can be dropped from the image instead.

Also fixed: Pre-commit checks (red on master, not caused by this PR)

The job has failed on every master commit since 314f520 (2026-08-23); the last green master was acf0db9 on 08-16. The poetry-lock hook is pinned to Poetry 1.8.5, which writes lock-version = "2.0", but poetry.lock was committed as lock-version = "2.1" by Poetry 2.x — so the hook rewrote the file on every run and failed with files were modified by this hook.

Re-locked with Poetry 1.8.5 and --no-update, which is what the pinned hook expects, rather than bumping the hook past 1.8.5: the pin is the repo's stated toolchain, and the run_tests job installs Poetry 1.4.0, which shares the 2.0 format.

The change is format-only:

• No dependency drift — 169 packages before and after, identical name == version sets. content-hash unchanged (313f2e96…), since pyproject.toml is untouched.
• The diff is 169 groups = lines, 23 markers = lines, and reformatted extras strings — keys that only exist in the 2.1 format.
• poetry check --lock passes under 1.8.5, and re-running poetry lock --no-update produces no further change, so the hook is idempotent.
• pre-commit run --all-files passes locally. Confirmed in a scratch worktree that the same hooks fail on origin/master with exit 1 and the same 2.1 → 2.0 rewrite, so this is the cause.
• poetry install --extras all --dry-run under Poetry 1.4.0 plans the same 166 packages before and after, so unblocking run_tests doesn't change what it installs.

⚠️ run_tests needs a maintainer: the Slack test token is deactivated

run_tests is gated on needs: check, so it has been skipped, not passing, ever since the pre-commit breakage on 08-23. The last time it actually executed was master acf0db9 on 08-16. Fixing the gate above un-masked a second, pre-existing problem.

Every failure in the run is the same dead credential — 375 passed, and all 10 failures plus 1 error are Slack API auth:

slack_sdk.errors.SlackApiError: The request to the Slack API failed. (url: https://slack.com/api/auth.test)
The server responded with: {'ok': False, 'error': 'account_inactive'}

The affected tests (test_blocks.py, test_slack.py, test_slack_preview.py, and test_install.py::test_robusta_install via robusta gen-config --slack-api-key) authenticate against the live Slack API using secrets.PYTEST_SLACK_TOKEN / secrets.PYTEST_IN_CLUSTER_SLACK_TOKEN. account_inactive is Slack's response for a deactivated token/workspace — it cannot be produced by a code change on our side, and nothing in this PR touches Slack. slack-sdk is byte-identical in the lockfile before and after.

This needs someone with Slack admin access to rotate those two repository secrets. It is not something this PR can fix, and it is not a reason to hold the CVE patches.

Already covered on master — no change needed

• wheel CVE-2026-24049: the built image ships wheel 0.46.3 (/usr/local) and 0.48.0 (/venv). The reported 0.45.1 is stale — fixed by fix webhook sink #2078.
• cryptography CVE-2026-69247 / CVE-2026-69248 / CVE-2026-69249: all fixed at ≤50.0.0, and the image ships 50.0.0. The pin comment now names the two CVEs it didn't mention yet.

No fix available anywhere — documented in the Dockerfile

• perl CVE-2026-57433, CVE-2026-13221, CVE-2026-57432, CVE-2026-15534, CVE-2026-19487. No fixed perl in trixie. perl-base is an Essential package shipped by python:3.11-slim itself, so the finding can't be dropped by removing git either, and forky's perl 5.42 requires glibc 2.43 — i.e. replacing libc6 in the runtime image.
• openssl CVE-2026-14456. Fixed in the unreleased 3.5.8; no Debian suite has it, sid included. Upstream rates it Low, and it only affects an OpenSSL QUIC server (SSL listener object), which the runner never creates.
• go 1.25.12 (CVE-2026-39821, CVE-2026-33818, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859, CVE-2026-56860, CVE-2026-56862, CVE-2026-56864, CVE-2026-56865). This is kubectl, the only Go binary in the image. The unpinned v1.35 channel already advances it from go1.25.12 (kubectl 1.35.7) to go1.26.5 (kubectl 1.35.8). The fixes need go1.25.13/1.26.6, released 2026-08-13, and no Kubernetes patch is built with those yet (1.36.4 is also go1.26.5) — a rebuild after the next patch clears them, so there is nothing to pin.

Verification

Built the image before and after and diffed both package versions and the unit-test suite:

• Only the three intended packages changed. libc6 stayed on 2.41-12+deb13u3 and libssl3t64 on 3.5.6-1~deb13u2, and no forky sources remain in the shipped image.
• Unit tests inside both images: 348 passed / 20 failed, identical on both. The 20 are pre-existing environment failures (no cluster, path assertions).
• Smoke-tested the patched code paths specifically: git ls-remote https://… (libssh2 via libcurl), cp -a / tar / install (libacl1/libattr1), kubectl version, and import robusta.
• The apt pin was validated with apt-get -s: the plan is exactly the three packages, forky's libc6/libssl3t64 keep trixie as their candidate, an unpinned forky package is invisible, and a target package with an unsatisfiable dependency fails with E: Unable to correct problems rather than upgrading glibc.
• PR CI builds amd64 only (arm64 is release-time), so arm64 resolution was checked against the forky/trixie arm64 indexes: all three packages exist there with the same dependency floors, all satisfied by trixie arm64.

Two things reviewers should know

1. The scan report will stay red on libssh2/attr/acl. Scanners that key off the distro release (docker scout, trivy) match on "the trixie advisory carries no fixed version" and ignore the installed version — verified with trivy, which still reports status=affected against libssh2 1.11.1-6. The vulnerable code really is gone; verify with dpkg -l libssh2-1t64 libattr1 libacl1 rather than the scan output. These findings need scanner exceptions, not more patching. This is called out in the Dockerfile so it doesn't get re-litigated.
2. forky is a rolling suite, so the versions installed here drift over time. If a future forky rebuild raises the libc6 floor above what trixie ships, apt refuses the install and this layer fails loudly rather than silently pulling in a new glibc.

Out of scope, but worth a follow-up

Trivy also flags util-linux 2.41-5 with four HIGH CVEs (CVE-2026-53612/53613/53614/53615) whose fix is already in trixie-security (2.41.5-0+deb13u1) but isn't being picked up. Not part of the reported set this PR addresses, so it's untouched here.

https://claude.ai/code/session_01RzFd3mVwr4a3nn1apZZVPu

[github-actions]

✅ Docker image ready for 8ff23bb (built in 3m 2s)

• us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:8ff23bb

⚠️ Warning: does not support ARM (ARM images are built on release only - not on every PR)

Use this tag to pull the image for testing.

📋 Copy commands

⚠️ Temporary images are deleted after 30 days. Copy to a permanent registry before using them:

gcloud auth configure-docker us-central1-docker.pkg.dev
docker pull us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:8ff23bb
docker tag us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:8ff23bb me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:8ff23bb
docker push me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:8ff23bb

Patch Helm values in one line:

helm upgrade --install robusta robusta/robusta \
  --reuse-values \
  --set runner.image=me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:8ff23bb

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Walkthrough

The Dockerfile removes comments about package pinning and CVE status. The associated APT and kubectl installation commands remain unchanged.

Changes

Container documentation cleanup

Layer / File(s)	Summary
Vulnerability coverage documentation Dockerfile	Removes comments about forky package pinning and kubectl and Go CVEs. Installation and configuration commands remain unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to f3a5b

The PR makes localized dependency and lockfile updates, with no actionable merge-blocking risk remaining after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the primary change: targeted CVE fixes for libssh2, attr, and acl from Debian forky.
Description check	✅ Passed	The description directly explains the CVE backports, apt pinning, Poetry lockfile repair, verification, and known test limitations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests
• Commit unit tests in branch claude/robusta-runner-cves-gqvg45

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Actionable comments posted: 1

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Inline comments:
In `@Dockerfile`:
- Around line 98-100: Update the Dockerfile APT configuration to remove the
global “-t forky” target, explicitly pin only the three intended forky packages,
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