CVE-2026-56315 json
picklescan - Remote Code Execution via Unblocked Standard Library Modules
published 8mo ago modified last mo. also EUVD-2026-38437 , GHSA-g38g-8gr9-h9xp , PYSEC-2026-4134
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, _osx_support, _aix_support, _pyrepl.pager, and imaplib) exposing eight functions that provide direct arbitrary command execution. Attackers can craft malicious pickle files importing these unblocked modules to achieve remote code execution while bypassing picklescan's safety validation entirely.
Patch / fix
Is CVE-2026-56315 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 4mo ago
Exploit prediction
1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/mmaitre314/picklescan/security/advisories/GHSA-g38g-8gr9-h9xp referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | picklescan | <1.0.4 |
1.0.4 |
Affected products
- picklescan picklescan
Classification
References
-
github.com
/mmaitre314/picklescan/commit/bf26452ae2e3204429762c2bb1aa9eacd40436bb
web
-
github.com
/mmaitre314/picklescan/security/advisories/GHSA-g38g-8gr9-h9xp
vendor-advisory, exploit, web
-
vulncheck.com
/advisories/picklescan-remote-code-execution-via-unblocked-standard-library-modules
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-56315
advisory
-
github.com
/mmaitre314/picklescan
package
-
pypi.org
/project/picklescan
package
-
github.com
/advisories/GHSA-g38g-8gr9-h9xp
advisory
Sources
- CVE List CVE-2026-56315
- GitHub Advisory GHSA-g38g-8gr9-h9xp
- NVD CVE-2026-56315
- OSV PYSEC-2026-4134
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.