# CVE-2023-32665: Gvariant deserialisation does not match spec for non-normal data

> A crafted GVariant input causes excessive processing in GLib, leading to denial of service for applications using the library.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 14 Sep 2023
- **Updated:** 14 Oct 2026
- **Also known as:** AZL-28776, DEBIAN-CVE-2023-32665, GHSA-c9xj-rf55-c64g, JLSEC-2025-164, UBUNTU-CVE-2023-32665

## What is CVE-2023-32665?

CVE-2023-32665 is a medium-severity denial of service vulnerability in Fedora Extra Packages for Enterprise Linux, published on 14 Sep 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in GLib. GVariant deserialization is vulnerable to an exponential blowup issue where a crafted GVariant can cause excessive processing, leading to denial of service.

Weakness: CWE-502 (Deserialization of Untrusted Data), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2023-32665?

It affects 1 product.


Products: Gnome Glib.

## How do I fix CVE-2023-32665?

Apply the vendor's patch.

## Is CVE-2023-32665 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32665 exists.

## Other vulnerabilities in Fedora Extra Packages for Enterprise Linux

- [CVE-2020-35457](https://insights.sbomify.com/CVE-2020-35457/): Integer overflow in n/a (high 7.8)
- [CVE-2009-3289](https://insights.sbomify.com/CVE-2009-3289/): Privilege escalation in n/a (high 7.8)
- [CVE-2025-13601](https://insights.sbomify.com/CVE-2025-13601/): Glib: integer overflow in in g_escape_uri_string() (high 7.7)
- [CVE-2026-58016](https://insights.sbomify.com/CVE-2026-58016/): Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml" (high 7.5)
- [CVE-2025-4056](https://insights.sbomify.com/CVE-2025-4056/): Glib: glib crash after long command line (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-32665 and fix it if it is affected.

What it is: CVE-2023-32665 is a medium-severity denial of service vulnerability in Fedora Extra Packages for Enterprise Linux, published on 14 Sep 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32665 exists.

Affected product: Fedora Extra Packages for Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-32665/ (Markdown: https://insights.sbomify.com/CVE-2023-32665/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32665
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32665
- OSV: https://osv.dev/vulnerability/CVE-2023-32665

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-32665/
Summaries are generated and may contain mistakes; the official description above is the record.