Vulnerability in picklescan (CVE-2026-56315)
Summary
Vulnerability in picklescan (CVE-2026-56315). Successful exploitation can lead to full system takeover. Exploitable via uuid. Mitigation: upgrade to 1.0.4 or later.
Original description
The description as published by the source.
Summary
picklescan v1.0.3 (latest) does not block at least 7 Python standard library modules that provide direct arbitrary command execution or code evaluation. A malicious pickle file importing these modules is reported as having 0 issues (CLEAN scan). This enables remote code execution that bypasses picklescan entirely.
Severity
Critical (CVSS 9.8) — Direct RCE with zero scanner detection. Affects all deployments relying on picklescan, including HuggingFace Hub.
Affected Versions
- picklescan <= 1.0.3 (all versions including latest)
Details
Unblocked RCE Modules
| Module | Function | RCE Mechanism | picklescan Result |
|---|---|---|---|
uuid |
_get_command_stdout(cmd, *args) |
subprocess.Popen((cmd,) + args) |
CLEAN |
_osx_support |
_read_output(cmdstring) |
os.system() via temp file |
CLEAN |
_osx_support |
_find_build_tool(toolname) |
Command injection via %s |
CLEAN |
_aix_support |
_read_cmd_output(cmdstring) |
os.system() |
CLEAN |
_pyrepl.pager |
pipe_pager(text, cmd) |
subprocess.Popen(cmd, shell=True) |
CLEAN |
_pyrepl.pager |
tempfile_pager(text, cmd) |
os.system(cmd + ...) |
CLEAN |
imaplib |
IMAP4_stream(command) |
subprocess.Popen(command, shell=True) |
CLEAN |
test.support.script_helper |
assert_python_ok(*args) |
Spawns python subprocess |
CLEAN |
All 8 functions are in Python's standard library and importable on all platforms.
#…
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-2026-56315 has been found in picklescan.
Attackers can target a specific entry point like uuid over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade picklescan to 1.0.4 or later.
If unsure, ask your IT team or search "picklescan CVE-2026-56315" on the vendor's site.
CVE-2026-56315 (picklescan) — CWE-184 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: uuid / _osx_support / _aix_support / _pyrepl.pager
Patched: 1.0.4 — 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.
A vulnerability (CWE-184) exists in picklescan. Attackers reach the vulnerable code path via uuid without authentication.
Check the vendor advisory for the affected versions of picklescan. Attack surface: uuid / _osx_support / _aix_support / _pyrepl.pager.
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.
Update to 1.0.4.
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 'picklescan' . 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 'picklescan' . | 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
picklescan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 picklescan to 1.0.4ステージング環境で 1.0.4 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
- advisory github.com
- package github.com
- package pypi.org
- web github.com
- web vulncheck.com
- web github.com
- web github.com