# CVE-2025-4082: WebGL shader attribute memory corruption in Thunderbird for macOS

> Out-of-bounds read in WebGL shader attributes on macOS Thunderbird allows privilege escalation when chained with other vulnerabilities.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Apr 2025
- **Updated:** 13 Apr 2026
- **Also known as:** GHSA-xhhw-j3h4-3x9r

## What is CVE-2025-4082?

CVE-2025-4082 is a medium-severity memory corruption vulnerability in Mozilla Firefox, published on 29 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges.
*This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

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

## Which versions are affected by CVE-2025-4082?

It affects 2 products.


Products: Mozilla Firefox, Mozilla Thunderbird.

## How do I fix CVE-2025-4082?

Upgrade to a fixed version.

## Is CVE-2025-4082 being exploited?

There is no known exploitation of CVE-2025-4082 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Firefox

- [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild)
- [CVE-2010-3765](https://insights.sbomify.com/CVE-2010-3765/): Mozilla Multiple Products Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-4082 and fix it if it is affected.

What it is: CVE-2025-4082 is a medium-severity memory corruption vulnerability in Mozilla Firefox, published on 29 Apr 2025. 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-2025-4082 in the wild and no public exploit code.

Affected product: Mozilla Firefox. 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-2025-4082/ (Markdown: https://insights.sbomify.com/CVE-2025-4082/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-4082
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-4082
- OSV: https://osv.dev/vulnerability/CVE-2025-4082

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-4082/
Summaries are generated and may contain mistakes; the official description above is the record.