# CVE-2026-107655: Cups: null pointer dereference via embedded job ticket comments allows remote denial of service

> An unauthenticated attacker can crash the CUPS print daemon by sending a crafted IPP request, causing a denial of service for printing services.

- **Severity:** Medium 4.0 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Oct 2026
- **Updated:** 12 Oct 2026
- **Also known as:** AZL-107966, BELL-CVE-2026-107655, DEBIAN-CVE-2026-107655, ECHO-1978-a125-c068, GHSA-58wv-9ffm-5w78, RHSA-2026:80679, UBUNTU-CVE-2026-107655

## What is CVE-2026-107655?

CVE-2026-107655 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in CUPS. When processing embedded job ticket comments within documents, the service improperly handles specific IPP attributes, causing an unhandled null pointer dereference. An unauthenticated attacker permitted to submit jobs to a shared printer queue can send a crafted Internet Printing Protocol (IPP) request to crash the print daemon, resulting in a temporary Denial of Service (DoS) for all printing services.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-107655?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `cups` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-client` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-devel` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-filesystem` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-ipptool` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-libs` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-lpd` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |
| `cups-printerapp` | Red Hat:hummingbird:1 | All versions | 0:2.4.19-4.4.hum1 |

## How do I fix CVE-2026-107655?

Apply the vendor's patch.

## Is CVE-2026-107655 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107655 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107655 and fix it if it is affected.

What it is: CVE-2026-107655 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-107655 exists.

Affected product: Red Hat Enterprise Linux 10. 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-2026-107655/ (Markdown: https://insights.sbomify.com/CVE-2026-107655/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107655
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107655
- OSV: https://osv.dev/vulnerability/CVE-2026-107655

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107655/
Summaries are generated and may contain mistakes; the official description above is the record.