CVE-2025-25362: Spacy llm Spacy-LLM Server-Side Template Injection (SSTI) Vulnerability

HIGH
Advisory Identifier: GHSA-793v-gxfp-9q9h
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CVSS 9.8
CWE-94 CWE-1336
Published
Advisory Summary

CVE-2025-25362 is a HIGH (CVSS 9.8) spacy-llm server-side template injection (ssti) vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Spacy llm libraries in the PyPI ecosystem. The issue involves spacy-llm server-side template injection (ssti) vulnerability. Remediation is available by upgrading affected packages to version 0.7.3.

CVE-2025-25362 at a Glance

CVE Identifier CVE-2025-25362
GHSA Identifier GHSA-793v-gxfp-9q9h
Severity HIGH
CVSS v3.1 Base Score 9.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Spacy llm
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

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

How to Fix CVE-2025-25362

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

spacy-llm fixed: 0.7.3 
pip install spacy-llm>=0.7.3
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 spacy-llm

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2025-25362, inspect your installed packages using pip:

pip show spacy-llm

Analyze the terminal output to locate any version of Spacy llm in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.3), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Spacy llm, 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

A Server-Side Template Injection (SSTI) vulnerability in Spacy-LLM v0.7.2 allows attackers to execute arbitrary code via injecting a crafted payload into the template field.

CVE-2025-25362 Affected Spacy llm Versions

1 component(s)
Fixed Versions:
0.7.3
Product / Package Ecosystem Affected Versions Fixed Version
spacy-llm
pypi/spacy-llm
PyPI
< 0.7.3
0.7.3

References

NVD — CVE-2025-25362 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-25362
Spacy llm Source Repository REPOSITORY
https://github.com/explosion/spacy-llm/issues/492
Spacy llm Source Repository REPOSITORY
https://github.com/explosion/spacy-llm/pull/491
Security Fix Commit FIX COMMIT
https://github.com/explosion/spacy-llm/commit/8bde0490cc1e9de9dd2e84480b7b5cd18a94d739
Spacy llm Source Repository REPOSITORY
https://github.com/explosion/spacy-llm
Spacy llm Security Information SECURITY
https://www.hacktivesecurity.com/blog/2025/04/01/cve-2025-25362-old-vulnerabilities-new-victims-breaking-llm-prompts-with-ssti

Frequently Asked Questions

What is CVE-2025-25362?
CVE-2025-25362 is a security vulnerability in Spacy llm involving Spacy-LLM Server-Side Template Injection (SSTI) vulnerability under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Spacy llm versions are affected?
Affected versions include releases prior to 0.7.3 across affected packages: spacy-llm.
What version fixes CVE-2025-25362?
Upgrading to 0.7.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is spacy-llm affected?
Yes, spacy-llm is affected in releases prior to 0.7.3. Upgrade your dependency to 0.7.3 or later.
What is the CVSS score of CVE-2025-25362?
CVE-2025-25362 has a CVSS v3.1 base score of 9.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2025-25362?
CVE-2025-25362 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check PyPI dependencies for CVE-2025-25362?
Run the dependency tree command: 'pip show spacy-llm'. 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-793v-gxfp-9q9h",
  "modified" : "2025-04-02T22:59:09Z",
  "published" : "2025-03-05T21:32:13Z",
  "aliases" : [ "CVE-2025-25362" ],
  "summary" : "Spacy-LLM Server-Side Template Injection (SSTI) vulnerability",
  "details" : "A Server-Side Template Injection (SSTI) vulnerability in Spacy-LLM v0.7.2 allows attackers to execute arbitrary code via injecting a crafted payload into the template field.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "spacy-llm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.7.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.7.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-25362"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/explosion/spacy-llm/issues/492"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/explosion/spacy-llm/pull/491"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/explosion/spacy-llm/commit/8bde0490cc1e9de9dd2e84480b7b5cd18a94d739"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/explosion/spacy-llm"
  }, {
    "type" : "WEB",
    "url" : "https://www.hacktivesecurity.com/blog/2025/04/01/cve-2025-25362-old-vulnerabilities-new-victims-breaking-llm-prompts-with-ssti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1336", "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-05T22:21:46Z",
    "nvd_published_at" : "2025-03-05T21:15:19Z"
  }
}