CVE-2025-70887: Signify Signify Allows A Remote Attacker Vulnerability

HIGH
Advisory Identifier: GHSA-p4hh-mq57-gq8x
Share
CWE-269
Published
Advisory Summary

CVE-2025-70887 is a HIGH signify allows a remote attacker vulnerability (CWE-269: Improper Privilege Management) affecting Signify libraries in the PyPI ecosystem. The issue involves signify allows a remote attacker to escalate privileges via the signed_data.py and the context.py components. Remediation is available by upgrading affected packages to version 0.9.2.

CVE-2025-70887 at a Glance

CVE Identifier CVE-2025-70887
GHSA Identifier GHSA-p4hh-mq57-gq8x
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-269: Improper Privilege Management
Affected Product Signify
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2025-70887

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

signify fixed: 0.9.2 
pip install signify>=0.9.2
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 signify

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2025-70887, inspect your installed packages using pip:

pip show signify

Analyze the terminal output to locate any version of Signify in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.2), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. In Signify, 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

An issue in ralphje Signify before v.0.9.2 allows a remote attacker to escalate privileges via the signed_data.py and the context.py components

CVE-2025-70887 Affected Signify Versions

1 component(s)
Fixed Versions:
0.9.2
Product / Package Ecosystem Affected Versions Fixed Version
signify
pypi/signify
PyPI
< 0.9.2
0.9.2

References

NVD — CVE-2025-70887 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-70887
Signify Source Repository REPOSITORY
https://github.com/mtrojnar/osslsigncode/issues/475
Signify Source Repository REPOSITORY
https://github.com/ralphje/signify/issues/60
Signify Source Repository REPOSITORY
https://github.com/mtrojnar/osslsigncode/pull/477
Security Fix Commit FIX COMMIT
https://github.com/ralphje/signify/commit/64f21c0cc06cea0536370686ca3ba7a01e4adaa8
Signify Release RELEASE
https://github.com/mtrojnar/osslsigncode/releases/tag/2.11
Signify Source Repository REPOSITORY
https://github.com/ralphje/signify

Frequently Asked Questions

What is CVE-2025-70887?
CVE-2025-70887 is a security vulnerability in Signify involving Signify allows a remote attacker to escalate privileges via the signed_data.py and the context.py components under CWE-269: Improper Privilege Management.
Which Signify versions are affected?
Affected versions include releases prior to 0.9.2 across affected packages: signify.
What version fixes CVE-2025-70887?
Upgrading to 0.9.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is signify affected?
Yes, signify is affected in releases prior to 0.9.2. Upgrade your dependency to 0.9.2 or later.
What CWE is associated with CVE-2025-70887?
CVE-2025-70887 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check PyPI dependencies for CVE-2025-70887?
Run the dependency tree command: 'pip show signify'. 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-p4hh-mq57-gq8x",
  "modified" : "2026-03-27T19:50:18Z",
  "published" : "2026-03-25T21:30:35Z",
  "aliases" : [ "CVE-2025-70887" ],
  "summary" : "Signify allows a remote attacker to escalate privileges via the signed_data.py and the context.py components",
  "details" : "An issue in ralphje Signify before v.0.9.2 allows a remote attacker to escalate privileges via the signed_data.py and the context.py components",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "signify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-70887"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mtrojnar/osslsigncode/issues/475"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ralphje/signify/issues/60"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mtrojnar/osslsigncode/pull/477"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ralphje/signify/commit/64f21c0cc06cea0536370686ca3ba7a01e4adaa8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mtrojnar/osslsigncode/releases/tag/2.11"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ralphje/signify"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-27T19:50:18Z",
    "nvd_published_at" : "2026-03-25T19:16:28Z"
  }
}