# CVE-2020-35457: Integer overflow in n/a

> An integer overflow in GLib's option group handling may lead to an out-of-bounds write, potentially allowing code execution.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** AZL-6435, CLSA-2025-1758705181, CLSA-2025-1758709468, CLSA-2025-1763023946, CLSA-2026-1777391919, CLSA-2026-1777392531, DEBIAN-CVE-2020-35457, GHSA-2fcx-98cm-5x99, JLSEC-2025-155

## What is CVE-2020-35457?

CVE-2020-35457 is a high-severity vulnerability in n/a, published on 14 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

GNOME GLib before 2.65.3 has an integer overflow, that might lead to an out-of-bounds write, in g_option_group_add_entries. NOTE: the vendor's position is "Realistically this is not a security issue. The standard pattern is for callers to provide a static list of option entries in a fixed number of calls to g_option_group_add_entries()." The researcher states that this pattern is undocumented

Weakness: CWE-787 (Out-of-bounds Write), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2020-35457?

It affects 1 product.


Products: Gnome Glib.

## How do I fix CVE-2020-35457?

Upgrade to a fixed version.

## Is CVE-2020-35457 being exploited?

There is no known exploitation of CVE-2020-35457 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [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)
- [CVE-2019-13012](https://insights.sbomify.com/CVE-2019-13012/): Misconfiguration in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35457 and fix it if it is affected.

What it is: CVE-2020-35457 is a high-severity vulnerability in n/a, published on 14 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-35457 in the wild and no public exploit code.

Affected product: n/a. 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-2020-35457/ (Markdown: https://insights.sbomify.com/CVE-2020-35457/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35457
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35457
- OSV: https://osv.dev/vulnerability/CVE-2020-35457

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35457/
Summaries are generated and may contain mistakes; the official description above is the record.