EUVD-2026-38123
GHSA-hqgf-f82p-fjh7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/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
Network-reachable with no auth or interaction (AV:N/PR:N/UI:N); impact limited to file creation (I:L) and lock-file DoS (A:L); no confidentiality impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/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
Lifecycle Timeline
3DescriptionCVE.org
picklescan before 1.0.1 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to create arbitrary zero-byte files via logging.FileHandler class instantiation. Attackers can exploit this by crafting malicious pickle payloads to bypass RCE blocklists and create lock files or other filesystem artifacts, potentially causing denial of service or application disruption.
AnalysisAI
Unsafe pickle deserialization in picklescan before 1.0.1 allows unauthenticated remote attackers to create arbitrary zero-byte files on the server by crafting malicious pickle payloads that instantiate Python's standard-library logging.FileHandler class. This technique bypasses RCE-focused blocklists because it abuses legitimate standard library functionality rather than commonly blocked modules, making it a notable blocklist-evasion primitive. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target system must be running picklescan version below 1.0.1 and must accept or process pickle files from untrusted sources (e.g., user uploads, network-delivered scan targets). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L) scores 6.9, reflecting a moderate severity due to constrained impact - integrity and availability are both Low, and confidentiality is unaffected. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a specially crafted pickle file to any service or pipeline that invokes picklescan to analyze user-uploaded files. The malicious pickle uses the REDUCE opcode to call logging.FileHandler('maintenance.lock'), which picklescan deserializes during scanning; this creates a zero-byte maintenance.lock file in the working directory. … |
| Remediation | Upgrade picklescan to version 1.0.1 immediately; this is the vendor-confirmed fixed version per the GHSA advisory (https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r) and the upstream fix is available via commit 4d9bc9cd34bca8672dad3481cd4556d5ba747156 and pull request https://github.com/mmaitre314/picklescan/pull/60. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More from same product – last 7 days
Remote code execution against users of picklescan versions prior to 1.0.4 is achievable by smuggling any blocked functio
Arbitrary code execution in picklescan before 0.0.33 allows remote attackers to bypass the scanner's malicious-pickle de
Arbitrary file write in picklescan before 0.0.33 lets attackers bypass the tool's dangerous-call blocklist by abusing di
Remote code execution in picklescan before 0.0.33 enables attackers to bypass the tool's malicious-pickle detection by s
Detection bypass in picklescan versions prior to 0.0.27 allows attackers to smuggle malicious Python pickle files past t
Share
External POC / Exploit Code
Leaving vuln.today