Path Traversal in github.com/fission/fission (CVE-2026-50567)
Summary
Path traversal in github.com/fission/fission (CVE-2026-50567). Data can be tampered with by attackers. Exploitable via Unarchive. Mitigation: upgrade to 1.25.0 or later.
Original description
The description as published by the source.
Unarchive in pkg/utils/zip.go joined each archive entry name with the destination directory via filepath.Join and wrote the result without checking whether the resolved path stayed under the destination. A zip entry named
../../tmp/evil therefore landed at /tmp/evil. An attacker who could control a Package.Spec.Source.URL or Deployment.URL archive could induce the fetcher (running as the per-environment pod's fission-fetcher sidecar) to write
files anywhere that process could reach: into other tenants' /packages// directories, into mounted secret/config volumes, or into the fetcher's own binary.
Affected
- Project:
github.com/fission/fission - Versions: all up to and including v1.24.0
- Audited commit:
647c141 - Component:
pkg/utils/zip.go(Unarchive) - Configuration: default; triggered when the fetcher downloads and extracts a zip archive
Fix section (paste into the Fix / Patches field)
Fixed in v1.25.0 by:
- PR #3444 (commit
55704aca) —Unarchivenow opens anos.Rooton the destination, validates each
archive entry name (rejects absolute paths and..traversal), and refuses symlink entries up front. Theos.Rootconfines everymkdir/createto the destination in the kernel.
Regression coverage: `TestUnarchiveZ…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-50567 has been found in github.com/fission/fission.
Attackers can target a specific entry point like Unarchive over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.7/10.
What to do: upgrade github.com/fission/fission to 1.25.0 or later.
If unsure, ask your IT team or search "github.com/fission/fission CVE-2026-50567" on the vendor's site.
CVE-2026-50567 (github.com/fission/fission) — CWE-22 / CVSS v3 7.7
Attack vector: remote (network-reachable) / no user interaction
Attack surface: Unarchive / filepath.Join / Package.Spec.Source.URL / Deployment.URL
Patched: 1.25.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in github.com/fission/fission. Attackers reach the vulnerable code path via Unarchive.
Check the vendor advisory for the affected versions of github.com/fission/fission. Attack surface: Unarchive / filepath.Join / Package.Spec.Source.URL / Deployment.URL.
Severity: High (CVSS 7.7/10). Data can be tampered with by attackers.
Update to 1.25.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/fission/fission' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/fission/fission' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/fission/fissionを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/fission/fission to 1.25.0ステージング環境で 1.25.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com