CVE-2026-3490 picklescan - Universal Blocklist Bypass via pkgutil.resolve_name
Attackers bypass picklescan's blocklist using pkgutil.resolve_name to execute arbitrary code via unsafe pickle deserialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3490?
CVE-2026-3490 is a critical code injection vulnerability in picklescan, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
picklescan before 1.0.4 fails to block pkgutil.resolve_name, allowing attackers to bypass the entire blocklist by resolving any dangerous function through indirect REDUCE calls. Remote attackers can invoke any blocked function such as os.system, builtins.exec, or subprocess.call to achieve remote code execution.
Weakness: CWE-183
Which versions are affected by CVE-2026-3490?
3 open source packages ship an affected version, including picklescan.
| Package | Affected | Fixed in |
|---|---|---|
picklescan PyPI | All versions | 1.0.4 |
picklescan PyPI | All versions | 1.0.4 |
picklescan PyPI | All versions | 1.0.4 |
How do I fix CVE-2026-3490?
Upgrade picklescan to 1.0.4 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-3490 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3490 exists.
Sources
Also known as GHSA-vvpj-8cmc-gx39, PYSEC-2026-456.