# CVE-2026-1489: Glib: glib: memory corruption via integer overflow in unicode case conversion

> An integer overflow in GLib's Unicode case conversion allows attackers to trigger memory corruption and potential code execution via crafted strings.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 27 Jan 2026
- **Updated:** 2 Jun 2026
- **Also known as:** AZL-76469, AZL-76545, BELL-CVE-2026-1489, DEBIAN-CVE-2026-1489, ECHO-6af9-fc0c-2334, GHSA-9m4g-m3p5-p6gm, OESA-2026-1683, UBUNTU-CVE-2026-1489

## What is CVE-2026-1489?

CVE-2026-1489 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A flaw was found in GLib. An integer overflow vulnerability in its Unicode case conversion implementation can lead to memory corruption. By processing specially crafted and extremely large Unicode strings, an attacker could trigger an undersized memory allocation, resulting in out-of-bounds writes. This could cause applications utilizing GLib for string conversion to crash or become unstable.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-1489?


## How do I fix CVE-2026-1489?

Apply the vendor's patch.

## Is CVE-2026-1489 being exploited?

There is no known exploitation of CVE-2026-1489 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1489 and fix it if it is affected.

What it is: CVE-2026-1489 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-1489 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-1489/ (Markdown: https://insights.sbomify.com/CVE-2026-1489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1489
- OSV: https://osv.dev/vulnerability/CVE-2026-1489

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1489/
Summaries are generated and may contain mistakes; the official description above is the record.