OSV-2026-301 Use-of-uninitialized-value in pcpp::IPv6Extension::getExtensionLen
Not scored
Published
Check this codebase for OSV-2026-301 and fix it if it is affected.
What it is: OSV-2026-301 is a vulnerability in pcapplusplus, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of OSV-2026-301 in the wild and no public exploit code.
Affected packages and fixed versions:
- pcapplusplus (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-2026-301/ (Markdown: https://insights.sbomify.com/OSV-2026-301/index.md)
An attacker can cause a denial of service by sending crafted IPv6 packets that trigger the use of an uninitialized value in the PcapPlusPlus library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2026-301?
OSV-2026-301 is a vulnerability in pcapplusplus, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=486705308
Crash type: Use-of-uninitialized-value
Crash state:
pcpp::IPv6Extension::getExtensionLen
pcpp::IPv6Layer::parseExtensions
pcpp::IPv6Layer::IPv6Layer
Which versions are affected by OSV-2026-301?
1 open source package ship an affected version, including pcapplusplus.
| Package | Affected | Fixed in |
|---|---|---|
pcapplusplus OSS-Fuzz | All versions | None |
How do I fix OSV-2026-301?
No fix has been published for OSV-2026-301 yet. Limit exposure of the affected software until one is available.
Is OSV-2026-301 being exploited?
There is no known exploitation of OSV-2026-301 in the wild and no public exploit code.