OSV-2021-991 Dynamic-stack-buffer-overflow in fmt::v8::detail::dragonbox::umul192_upper64
Not scored
Published
Check this codebase for OSV-2021-991 and fix it if it is affected.
What it is: OSV-2021-991 is a memory corruption vulnerability in fmt, published on 14 Jul 2021.
Exploitation: There is no known exploitation of OSV-2021-991 in the wild and no public exploit code.
Affected packages and fixed versions:
- fmt (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-2021-991/ (Markdown: https://insights.sbomify.com/OSV-2021-991/index.md)
A dynamic stack buffer overflow in the fmt library's dragonbox implementation allows attackers to cause crashes or potentially execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-991?
OSV-2021-991 is a memory corruption vulnerability in fmt, published on 14 Jul 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36110
Crash type: Dynamic-stack-buffer-overflow WRITE 8
Crash state:
fmt::v8::detail::dragonbox::umul192_upper64
fmt::v8::detail::dragonbox::cache_accessor<double>::compute_mul
fmt::v8::detail::dragonbox::decimal_fp<double> fmt::v8::detail::dragonbox::to_de
Which versions are affected by OSV-2021-991?
1 open source package ship an affected version, including fmt.
| Package | Affected | Fixed in |
|---|---|---|
fmt OSS-Fuzz | All versions | None |
How do I fix OSV-2021-991?
No fix has been published for OSV-2021-991 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-2021-991 being exploited?
There is no known exploitation of OSV-2021-991 in the wild and no public exploit code.