CVE-2026-33046: Indico Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-rm2q-f7jv-3cfp
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CWE-78 CWE-22
Published
Advisory Summary

CVE-2026-33046 is a HIGH remote code execution vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Indico libraries in the PyPI ecosystem. The issue involves indico discloses local files resulting in remote code execution through latex injection. Remediation is available by upgrading affected packages to version 3.3.12.

CVE-2026-33046 at a Glance

CVE Identifier CVE-2026-33046
GHSA Identifier GHSA-rm2q-f7jv-3cfp
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Indico
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-33046

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

indico fixed: 3.3.12 
pip install indico>=3.3.12
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 indico

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-33046, inspect your installed packages using pip:

pip show indico

Analyze the terminal output to locate any version of Indico in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.12), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Indico, 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

> [!NOTE] > If server-side LaTeX rendering is not in use (ie `XELATEX_PATH` was not set in `indico.conf`), this vulnerability does not apply. ### Impact Due to vulnerabilities in TeXLive and obscure LaTeX syntax that allowed circumventing Indico's LaTeX sanitizer, it is possible to use specially-crafted LaTeX snippets which can read local files or execute code with the privileges of the user running Indico on the server. ### Patches It is recommended to update to [Indico 3.3.12](https://github.com/indico/indico/releases/tag/v3.3.12) as soon as possible. See [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update. It is also strongly recommended to enable the containerized LaTeX renderer (using `podman`), which isolates it from the rest of the system. See [the docs](https://docs.getindico.io/en/stable/installation/upgrade/#upgrading-to-3-3-12) for details - it is very easy and from now on the only recommended/supported way of using LaTeX. ### Workarounds Remove the `XELATEX_PATH` setting from `indico.conf` (or comment it out or set it to `None`) and restart the `indico-uwsgi` and `indico-celery` services to disable LaTeX functionality. ### For more information For any questions or comments about this advisory: - Open a thread in [the forum](https://talk.getindico.io/) - Send an email to [indico-team@cern.ch](mailto:indico-team@cern.ch)

CVE-2026-33046 Affected Indico Versions

1 component(s)
Fixed Versions:
3.3.12
Product / Package Ecosystem Affected Versions Fixed Version
indico
pypi/indico
PyPI
< 3.3.12
3.3.12

References

GitHub Advisory / Wiki ADVISORY
https://github.com/indico/indico/security/advisories/GHSA-rm2q-f7jv-3cfp
NVD — CVE-2026-33046 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33046
Security Fix Commit FIX COMMIT
https://github.com/indico/indico/commit/0adb70f0ed66e129361d447868f5f3eb90dc5e96
Security Fix Commit FIX COMMIT
https://github.com/indico/indico/commit/1dbb12525b3de14229bf4d1ae192988068f975f6
Security Fix Commit FIX COMMIT
https://github.com/indico/indico/commit/5f24d23ce9c4b0e4b68b3d0b58987a948fc57c8a
Security Fix Commit FIX COMMIT
https://github.com/indico/indico/commit/fb169ced710c30cf792ce4b9f48688db0633cfd8
Indico Source Repository REPOSITORY
https://github.com/indico/indico
Indico Release RELEASE
https://github.com/indico/indico/releases/tag/v3.3.12

Frequently Asked Questions

What is CVE-2026-33046?
CVE-2026-33046 is a security vulnerability in Indico involving Indico discloses local files resulting in Remote Code Execution through LaTeX injection under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Indico versions are affected?
Affected versions include releases prior to 3.3.12 across affected packages: indico.
What version fixes CVE-2026-33046?
Upgrading to 3.3.12 (or the latest patched release for your respective branch) resolves the vulnerability.
Is indico affected?
Yes, indico is affected in releases prior to 3.3.12. Upgrade your dependency to 3.3.12 or later.
What CWE is associated with CVE-2026-33046?
CVE-2026-33046 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2026-33046?
Run the dependency tree command: 'pip show indico'. 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-rm2q-f7jv-3cfp",
  "modified" : "2026-03-25T20:46:37Z",
  "published" : "2026-03-23T20:43:43Z",
  "aliases" : [ "CVE-2026-33046" ],
  "summary" : "Indico discloses local files resulting in Remote Code Execution through LaTeX injection ",
  "details" : "> [!NOTE]\n> If server-side LaTeX rendering is not in use (ie `XELATEX_PATH` was not set in `indico.conf`), this vulnerability does not apply.\n\n### Impact\nDue to vulnerabilities in TeXLive and obscure LaTeX syntax that allowed circumventing Indico's LaTeX sanitizer, it is possible to use specially-crafted LaTeX snippets which can read local files or execute code with the privileges of the user running Indico on the server.\n\n### Patches\nIt is recommended to update to [Indico 3.3.12](https://github.com/indico/indico/releases/tag/v3.3.12) as soon as possible.\nSee [the docs](https://docs.getindico.io/en/stable/installation/upgrade/) for instructions on how to update.\n\nIt is also strongly recommended to enable the containerized LaTeX renderer (using `podman`), which isolates it from the rest of the system. See [the docs](https://docs.getindico.io/en/stable/installation/upgrade/#upgrading-to-3-3-12) for details - it is very easy and from now on the only recommended/supported way of using LaTeX.\n\n### Workarounds\nRemove the `XELATEX_PATH` setting from `indico.conf` (or comment it out or set it to `None`) and restart the `indico-uwsgi` and `indico-celery` services to disable LaTeX functionality.\n\n### For more information\nFor any questions or comments about this advisory:\n\n- Open a thread in [the forum](https://talk.getindico.io/)\n- Send an email to [indico-team@cern.ch](mailto:indico-team@cern.ch)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "indico"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.12"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/security/advisories/GHSA-rm2q-f7jv-3cfp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33046"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/commit/0adb70f0ed66e129361d447868f5f3eb90dc5e96"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/commit/1dbb12525b3de14229bf4d1ae192988068f975f6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/commit/5f24d23ce9c4b0e4b68b3d0b58987a948fc57c8a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/commit/fb169ced710c30cf792ce4b9f48688db0633cfd8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/indico/indico"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/indico/indico/releases/tag/v3.3.12"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22", "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-23T20:43:43Z",
    "nvd_published_at" : "2026-03-23T23:17:12Z"
  }
}