# CVE-2023-41104: Memory corruption in n/a

> Out-of-bounds memory access in libvmod-digest allows authentication bypass and information disclosure depending on VCL configuration.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Aug 2023
- **Updated:** 3 Oct 2024
- **Also known as:** GHSA-rrpc-jfj4-37w9

## What is CVE-2023-41104?

CVE-2023-41104 is a medium-severity memory corruption vulnerability in n/a, published on 23 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2023-41104?

It affects 2 products.


Products: Varnish-Software Varnish Enterprise, Varnish-Software Vmod Digest.

## How do I fix CVE-2023-41104?

No fix has been published for CVE-2023-41104 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-41104 being exploited?

There is no known exploitation of CVE-2023-41104 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2026-34475](https://insights.sbomify.com/CVE-2026-34475/): Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / (medium 5.4)
- [CVE-2025-30346](https://insights.sbomify.com/CVE-2025-30346/): Other in Varnish Cache (medium 5.4)
- [CVE-2026-40394](https://insights.sbomify.com/CVE-2026-40394/): Denial of service in Varnish Cache (medium 4.0)
- [CVE-2026-40395](https://insights.sbomify.com/CVE-2026-40395/): Denial of service in Varnish Enterprise (medium 4.0)
- [CVE-2025-30347](https://insights.sbomify.com/CVE-2025-30347/): Information disclosure in Varnish Enterprise (medium 4.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-41104 and fix it if it is affected.

What it is: CVE-2023-41104 is a medium-severity memory corruption vulnerability in n/a, published on 23 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-41104 in the wild and no public exploit code.

Affected product: n/a. 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-2023-41104/ (Markdown: https://insights.sbomify.com/CVE-2023-41104/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-41104
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-41104
- OSV: https://osv.dev/vulnerability/CVE-2023-41104

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-41104/
Summaries are generated and may contain mistakes; the official description above is the record.