OSV-2021-849 Negative-size-param in mrb_str_format
Not scored
Published
Check this codebase for OSV-2021-849 and fix it if it is affected.
What it is: OSV-2021-849 is a vulnerability in mruby, published on 11 Jun 2021.
Exploitation: There is no known exploitation of OSV-2021-849 in the wild and no public exploit code.
Affected packages and fixed versions:
- mruby (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-2021-849/ (Markdown: https://insights.sbomify.com/OSV-2021-849/index.md)
A negative size parameter in the string formatting function can cause a crash, leading to denial of service in applications using the library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2021-849?
OSV-2021-849 is a vulnerability in mruby, published on 11 Jun 2021.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35109
Crash type: Negative-size-param
Crash state:
mrb_str_format
mrb_f_sprintf
mrb_vm_exec
Which versions are affected by OSV-2021-849?
1 open source package ship an affected version, including mruby.
| Package | Affected | Fixed in |
|---|---|---|
mruby OSS-Fuzz | All versions | None |
How do I fix OSV-2021-849?
No fix has been published for OSV-2021-849 yet. Limit exposure of the affected software until one is available.
Is OSV-2021-849 being exploited?
There is no known exploitation of OSV-2021-849 in the wild and no public exploit code.