# CVE-2026-13002: Dnsmasq: infinite loop dos in dnssec nsec/nsec3 type bitmap parsing

> An attacker controlling a DNSSEC-signed zone can cause an infinite loop in dnsmasq, denying DNS resolution for clients.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** AZL-96617, BELL-CVE-2026-13002, DEBIAN-CVE-2026-13002, ECHO-e07c-2fba-e60c, GHSA-gf7x-hg8h-x3gf, UBUNTU-CVE-2026-13002

## What is CVE-2026-13002?

CVE-2026-13002 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flow has been identified into dnssec.c library, causing an infinite loop to dnsmasq service. An attacker who controls any DNSSEC-signed zone can hang the dnsmasq process with a single crafted response, killing all DNS resolution for its clients.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2026-13002?

It affects 2 products.


Products: Redhat Enterprise Linux, Redhat Openshift Container Platform.

## How do I fix CVE-2026-13002?

No fix has been published for CVE-2026-13002 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13002 being exploited?

There is no known exploitation of CVE-2026-13002 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2018-14667](https://insights.sbomify.com/CVE-2018-14667/): Red Hat JBoss RichFaces Framework Expression Language Injection (critical 9.8, exploited in the wild)
- [CVE-2021-20325](https://insights.sbomify.com/CVE-2021-20325/): Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit (critical 9.8)
- [CVE-2018-25011](https://insights.sbomify.com/CVE-2018-25011/): Memory corruption in libwebp (critical 9.8)
- [CVE-2018-25014](https://insights.sbomify.com/CVE-2018-25014/): Other in libwebp (critical 9.8)
- [CVE-2014-3585](https://insights.sbomify.com/CVE-2014-3585/): Supply chain in redhat-upgrade-tool (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13002 and fix it if it is affected.

What it is: CVE-2026-13002 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13002 in the wild and no public exploit code.

Affected product: Redhat Enterprise Linux. 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-2026-13002/ (Markdown: https://insights.sbomify.com/CVE-2026-13002/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13002
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13002
- OSV: https://osv.dev/vulnerability/CVE-2026-13002

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13002/
Summaries are generated and may contain mistakes; the official description above is the record.