GHSA-23JG-5F8M-GW8C

Vulnerability from github – Published: 2026-04-05 12:30 – Updated: 2026-04-08 00:06
VLAI?
Summary
PyBlade: SSTI/RCE via Bypassed AST Validation in sandbox.py
Details

A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _is_safe_ast of the file sandbox.py of the component AST Validation. Such manipulation leads to improper neutralization of special elements used in a template engine. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Severity ?
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyblade"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.8-alpha"
            },
            {
              "last_affected": "0.2.0-alpha"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5559"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-791"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T00:06:47Z",
    "nvd_published_at": "2026-04-05T11:16:55Z",
    "severity": "LOW"
  },
  "details": "A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _is_safe_ast of the file sandbox.py of the component AST Validation. Such manipulation leads to improper neutralization of special elements used in a template engine. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.",
  "id": "GHSA-23jg-5f8m-gw8c",
  "modified": "2026-04-08T00:06:47Z",
  "published": "2026-04-05T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5559"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntaresMugisho/PyBlade/issues/1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AntaresMugisho/PyBlade/issues/1#issue-4086730906"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/AntaresMugisho/PyBlade"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/782904"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/355329"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/355329/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PyBlade: SSTI/RCE via Bypassed AST Validation in sandbox.py"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.