CVE-2026-92391 curl_mime_free stack overflow by recursion
Not scored
Published
Updated
Check this codebase for CVE-2026-92391 and fix it if it is affected.
What it is: CVE-2026-92391 is a vulnerability in curl, published on 20 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-92391 in the wild and no public exploit code.
Affected product: curl. 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-2026-92391/ (Markdown: https://insights.sbomify.com/CVE-2026-92391/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-92391?
CVE-2026-92391 is a vulnerability in curl, published on 20 Oct 2026.
Official description
A deeply nested multipart MIME structure constructed via the public API causes a stack overflow in libcurl during normal cleanup operations. An excessive recursion depth within `curl_mime_free` leads to unbounded stack frame allocation during structure traversal, ultimately crashing the host process.
Which versions are affected by CVE-2026-92391?
How do I fix CVE-2026-92391?
Upgrade to a fixed version.
Is CVE-2026-92391 being exploited?
There is no known exploitation of CVE-2026-92391 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-92391, AZL-109902, AZL-109959, AZL-110040, AZL-110187, AZL-110229 and 8 more.