Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / binwalk/PYSEC-2026-788
Advisory ID pypa/binwalk/PYSEC-2026-788
Aliases CVE-2021-4287
GHSA-8m3f-g62j-3vx8
PYSEC-2026-788
Summary binwalk vulnerable to UNIX Symbolic Link (Symlink) Following A vulnerability, which was classified as problematic, was found in ReFirm Labs binwalk up to 2.3.2. Affected is an unknown function of the file src/binwalk/modules/extractor.py of the component Archive Extraction Handler. The manipulation leads to symlink following. It is possible to launch the attack remotely. Upgrading to version 2.3.3 can address this issue. The name of the patch is fa0c0bd59b8588814756942fe4cb5452e76c1dcd. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216876.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 6.5 https://github.com/pypa/advisory-database/blob/main/vulns/binwalk/PYSEC-2026-788.yaml
Reference id Reference type URL
https://github.com/ReFirmLabs/binwalk
https://pypi.org/project/binwalk
556 Bug https://github.com/ReFirmLabs/binwalk/pull/556
?ctiid.216876 Other https://vuldb.com/?ctiid.216876
CVE-2021-4287 https://nvd.nist.gov/vuln/detail/CVE-2021-4287
fa0c0bd59b8588814756942fe4cb5452e76c1dcd Other https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd
GHSA-8m3f-g62j-3vx8 https://github.com/advisories/GHSA-8m3f-g62j-3vx8
?id.216876 Advisory https://vuldb.com/?id.216876
v2.3.3 Other https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://github.com/pypa/advisory-database/blob/main/vulns/binwalk/PYSEC-2026-788.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-11T14:42:13Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2021/4xxx/CVE-2021-4287.json

Source Advisory: vulnrichment/CVE-2021-4287

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]