# CVE-2026-34708: InCopy | Stack-based Buffer Overflow (CWE-121)

> A stack-based buffer overflow in Adobe InCopy allows arbitrary code execution if a user opens a malicious file.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 9 Jun 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-xvhc-r5q4-hcgj

## What is CVE-2026-34708?

CVE-2026-34708 is a high-severity memory corruption vulnerability in Adobe Incopy, published on 9 Jun 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

InCopy versions 21.3, 20.5.3 and earlier are affected by a Stack-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-34708?

It affects 1 product.


Products: Adobe Incopy.

## How do I fix CVE-2026-34708?

No fix has been published for CVE-2026-34708 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34708 being exploited?

There is no known exploitation of CVE-2026-34708 in the wild and no public exploit code.

## Other vulnerabilities in Adobe Incopy

- [CVE-2021-21090](https://insights.sbomify.com/CVE-2021-21090/): Adobe InCopy DOCX file parsing directory traversal vulnerability could lead to remote code execution (high 8.8)
- [CVE-2026-34706](https://insights.sbomify.com/CVE-2026-34706/): InCopy | Out-of-bounds Write (CWE-787) (high 7.8)
- [CVE-2026-34707](https://insights.sbomify.com/CVE-2026-34707/): InCopy | Heap-based Buffer Overflow (CWE-122) (high 7.8)
- [CVE-2026-27287](https://insights.sbomify.com/CVE-2026-27287/): InCopy | Out-of-bounds Read (CWE-125) (high 7.8)
- [CVE-2026-34631](https://insights.sbomify.com/CVE-2026-34631/): InCopy | Out-of-bounds Write (CWE-787) (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34708 and fix it if it is affected.

What it is: CVE-2026-34708 is a high-severity memory corruption vulnerability in Adobe Incopy, published on 9 Jun 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: There is no known exploitation of CVE-2026-34708 in the wild and no public exploit code.

Affected product: Adobe Incopy. 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-2026-34708/ (Markdown: https://insights.sbomify.com/CVE-2026-34708/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34708
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34708
- OSV: https://osv.dev/vulnerability/CVE-2026-34708

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-34708/
Summaries are generated and may contain mistakes; the official description above is the record.