CVE-2026-12565: BBOT Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-3vgw-585j-4m45
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CVSS 5.3
CWE-61 CWE-22
Published
Advisory Summary

CVE-2026-12565 is a MODERATE (CVSS 5.3) path traversal vulnerability (CWE-61: UNIX Symbolic Link (Symlink) Following) affecting BBOT libraries in the PyPI ecosystem. The issue involves path traversal (zip-slip) in unarchive module - incomplete fix for cve-2025-10284. Remediation is available by upgrading affected packages to version 2.8.5.

CVE-2026-12565 at a Glance

CVE Identifier CVE-2026-12565
GHSA Identifier GHSA-3vgw-585j-4m45
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-61: UNIX Symbolic Link (Symlink) Following
Affected Product BBOT
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-12565

To remediate this vulnerability, upgrade all affected BBOT dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

bbot fixed: 2.8.5 
pip install bbot>=2.8.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show bbot

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-12565, inspect your installed packages using pip:

pip show bbot

Analyze the terminal output to locate any version of BBOT in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.8.5), your application is affected.

Note: The pip show bbot command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-61: UNIX Symbolic Link (Symlink) Following, where the product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. this could allow an attacker to cause the product to operate on unauthorized files. In BBOT, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The `unarchive` internal module's archive extraction commands perform no code-level validation on extracted file paths, relying entirely on the behavior of external tools (e.g. GNU tar) which varies by platform. While CVE-2025-10284 addressed git-specific RCE vectors, the underlying archive extraction path traversal was never fixed. On systems with GNU tar < 1.34 (Ubuntu 20.04, Debian Buster, CentOS 7, many Docker base images), a malicious archive can write files outside the intended extraction directory.

CVE-2026-12565 Affected BBOT Versions

1 component(s)
Fixed Versions:
2.8.5
Product / Package Ecosystem Affected Versions Fixed Version
bbot
pypi/bbot
PyPI
≥ 2.3.1
< 2.8.5
2.8.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/blacklanternsecurity/bbot/security/advisories/GHSA-3vgw-585j-4m45
NVD — CVE-2026-12565 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12565
Security Fix Commit FIX COMMIT
https://github.com/blacklanternsecurity/bbot/commit/4fb38fd6e
BBOT Source Repository REPOSITORY
https://github.com/blacklanternsecurity/bbot

Frequently Asked Questions

What is CVE-2026-12565?
CVE-2026-12565 is a security vulnerability in BBOT involving Path traversal (Zip-Slip) in unarchive module - incomplete fix for CVE-2025-10284 under CWE-61: UNIX Symbolic Link (Symlink) Following.
Which BBOT versions are affected?
Affected versions include releases prior to 2.8.5 across affected packages: bbot.
What version fixes CVE-2026-12565?
Upgrading to 2.8.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bbot affected?
Yes, bbot is affected in releases prior to 2.8.5. Upgrade your dependency to 2.8.5 or later.
What is the CVSS score of CVE-2026-12565?
CVE-2026-12565 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-12565?
CVE-2026-12565 is classified under CWE-61: UNIX Symbolic Link (Symlink) Following (The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.).
How can I check PyPI dependencies for CVE-2026-12565?
Run the dependency tree command: 'pip show bbot'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3vgw-585j-4m45",
  "modified" : "2026-06-18T15:02:35Z",
  "published" : "2026-06-18T15:02:35Z",
  "aliases" : [ "CVE-2026-12565" ],
  "summary" : "BBOT: Path traversal (Zip-Slip) in unarchive module - incomplete fix for CVE-2025-10284",
  "details" : "The `unarchive` internal module's archive extraction commands perform no code-level validation on extracted file paths, relying entirely on the behavior of external tools (e.g. GNU tar) which varies by platform. While CVE-2025-10284 addressed git-specific RCE vectors, the underlying archive extraction path traversal was never fixed. On systems with GNU tar < 1.34 (Ubuntu 20.04, Debian Buster, CentOS 7, many Docker base images), a malicious archive can write files outside the intended extraction directory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "bbot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.3.1"
      }, {
        "fixed" : "2.8.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.8.4"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/blacklanternsecurity/bbot/security/advisories/GHSA-3vgw-585j-4m45"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12565"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/blacklanternsecurity/bbot/commit/4fb38fd6e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/blacklanternsecurity/bbot"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22", "CWE-61" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-18T15:02:35Z",
    "nvd_published_at" : "2026-06-17T23:17:02Z"
  }
}