CVE-2026-113351 libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
High 8.2
Published
Updated
Check this codebase for CVE-2026-113351 and fix it if it is affected.
What it is: CVE-2026-113351 is a high-severity vulnerability in libexpat, published on 20 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-113351 in the wild and no public exploit code.
Affected product: libexpat. 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-2026-113351/ (Markdown: https://insights.sbomify.com/CVE-2026-113351/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113351?
CVE-2026-113351 is a high-severity vulnerability in libexpat, published on 20 Oct 2026.
Official description
libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
Weakness: CWE-909
Which versions are affected by CVE-2026-113351?
How do I fix CVE-2026-113351?
Upgrade to a fixed version.
Is CVE-2026-113351 being exploited?
There is no known exploitation of CVE-2026-113351 in the wild and no public exploit code.
Sources
Also known as AZL-109989, BELL-CVE-2026-113351, DEBIAN-CVE-2026-113351, ECHO-8447-5ec2-6e1c, GHSA-6r6q-9jmv-gg3h, ROOT-OS-DEBIAN-13-CVE-2026-113351 and 1 more.