CVE-2026-76891 Expired Pointer Dereference in Wireshark
Low 3.1
Published
Updated
Check this codebase for CVE-2026-76891 and fix it if it is affected.
What it is: CVE-2026-76891 is a low-severity vulnerability in Wireshark Wireshark, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-76891 in the wild and no public exploit code.
Affected product: Wireshark Wireshark. 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-2026-76891/ (Markdown: https://insights.sbomify.com/CVE-2026-76891/index.md)
An attacker can cause a denial of service in Wireshark's sharkd component by triggering an expired pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-76891?
CVE-2026-76891 is a low-severity vulnerability in Wireshark Wireshark, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Crash in sharkd in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
Weakness: CWE-825
Which versions are affected by CVE-2026-76891?
It affects 1 product.
Products include Wireshark Wireshark.
How do I fix CVE-2026-76891?
Upgrade to a fixed version.
Is CVE-2026-76891 being exploited?
There is no known exploitation of CVE-2026-76891 in the wild and no public exploit code.
Other vulnerabilities in Wireshark Wireshark
Sources
Also known as AZL-96825, DEBIAN-CVE-2026-76891, GHSA-wmqm-vgc4-jrp6, MINI-vqxj-9g75-6x9p, UBUNTU-CVE-2026-76891.