OSV-2025-433 Null-dereference READ in _libssh2_packet_add
Not scored
Published
Check this codebase for OSV-2025-433 and fix it if it is affected.
What it is: OSV-2025-433 is a vulnerability in libssh2, published on 5 Jun 2025. It can be exploited over the network, with no action from the victim.
Exploitation: There is no known exploitation of OSV-2025-433 in the wild and no public exploit code.
Affected packages and fixed versions:
- libssh2 (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-2025-433/ (Markdown: https://insights.sbomify.com/OSV-2025-433/index.md)
A null pointer dereference in libssh2's packet handling can cause a denial of service when processing malformed network packets.
- Exploited in the wild
- Not known
- Login needed
- Not stated
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2025-433?
OSV-2025-433 is a vulnerability in libssh2, published on 5 Jun 2025. It can be exploited over the network, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=422217191
Crash type: Null-dereference READ
Crash state:
_libssh2_packet_add
fullpacket
_libssh2_transport_read
Which versions are affected by OSV-2025-433?
1 open source package ship an affected version, including libssh2.
| Package | Affected | Fixed in |
|---|---|---|
libssh2 OSS-Fuzz | All versions | None |
How do I fix OSV-2025-433?
No fix has been published for OSV-2025-433 yet. Limit exposure of the affected software until one is available.
Is OSV-2025-433 being exploited?
There is no known exploitation of OSV-2025-433 in the wild and no public exploit code.