# CVE-2026-111677: Antiword through 0.37 Heap Out-of-Bounds Read via vGet8LstInfo in prop8.c

> Attackers can crash the application by providing a crafted Word document that triggers a heap out-of-bounds read in the Antiword parser.

- **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 18 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-111677, GHSA-v4mq-qwjh-99x8, UBUNTU-CVE-2026-111677

## What is CVE-2026-111677?

CVE-2026-111677 is a medium-severity memory corruption vulnerability in Adri van Os antiword, published on 16 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Antiword through 0.37 contains a heap out-of-bounds read vulnerability in vGet8LstInfo in prop8.c caused by an inverted bounds check on the PlcfLst record count. Attackers can supply a crafted Word 8 .doc file claiming up to 0xffff LSTF records in a tiny buffer, causing reads past the heap allocation that crash the process.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-111677?

It affects 1 product.


Products: Antiword Project Antiword.

## How do I fix CVE-2026-111677?

No fix has been published for CVE-2026-111677 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111677 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111677 exists.

## Other vulnerabilities in Adri van Os antiword

- [CVE-2014-8123](https://insights.sbomify.com/CVE-2014-8123/): Memory corruption in n/a (medium 5.0)
- [CVE-2026-111678](https://insights.sbomify.com/CVE-2026-111678/): Antiword through 0.37 Stack Out-of-Bounds Read via prop8.c FKP Parsing (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111677 and fix it if it is affected.

What it is: CVE-2026-111677 is a medium-severity memory corruption vulnerability in Adri van Os antiword, published on 16 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111677 exists.

Affected product: Adri van Os antiword. 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-2026-111677/ (Markdown: https://insights.sbomify.com/CVE-2026-111677/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111677
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111677
- OSV: https://osv.dev/vulnerability/CVE-2026-111677

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111677/
Summaries are generated and may contain mistakes; the official description above is the record.