OSV-2026-512 Heap-buffer-overflow in g_utf8_get_char
Not scored
Published
Check this codebase for OSV-2026-512 and fix it if it is affected.
What it is: OSV-2026-512 is a memory corruption vulnerability in glib, published on 3 Apr 2026.
Exploitation: There is no known exploitation of OSV-2026-512 in the wild and no public exploit code.
Affected packages and fixed versions:
- glib (OSS-Fuzz): affected all versions; no fix listed
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/OSV-2026-512/ (Markdown: https://insights.sbomify.com/OSV-2026-512/index.md)
A heap buffer overflow in GLib's UTF-8 character handling can cause a crash when processing malformed markup text.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2026-512?
OSV-2026-512 is a memory corruption vulnerability in glib, published on 3 Apr 2026.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=498475244
Crash type: Heap-buffer-overflow READ 1
Crash state:
g_utf8_get_char
g_markup_escape_text
fuzz_markup_escape_text.c
Which versions are affected by OSV-2026-512?
1 open source package ship an affected version, including glib.
| Package | Affected | Fixed in |
|---|---|---|
glib OSS-Fuzz | All versions | None |
How do I fix OSV-2026-512?
No fix has been published for OSV-2026-512 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2026-512 being exploited?
There is no known exploitation of OSV-2026-512 in the wild and no public exploit code.