# ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer

Advisory record · `GHSA-jjfr-hcj7-qf5w`

- **Identifiers:** `GHSA-jjfr-hcj7-qf5w` · `CVE-2026-106115`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-787](https://cwe.mitre.org/data/definitions/787.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Published:** 7 Oct 2026
- **Updated:** 26 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Oct 2026, 20:24 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `SixLabors.ImageSharp` (NuGet): affected `>=2.1.0, <3.2.0 || >=4.0.0, <4.1.2`; fixed in `3.2.0`, `4.1.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0039, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:21 UTC: First seen by agentprime
- 31 Oct 2026, 15:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-jjfr-hcj7-qf5w)

## Sources

- [GitHub Advisory Database: GHSA-jjfr-hcj7-qf5w](https://github.com/advisories/GHSA-jjfr-hcj7-qf5w)
- [OSV: GHSA-jjfr-hcj7-qf5w](https://osv.dev/vulnerability/GHSA-jjfr-hcj7-qf5w)
- <https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jjfr-hcj7-qf5w>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-106115>
- <https://github.com/SixLabors/ImageSharp/pull/3187>
- <https://github.com/SixLabors/ImageSharp/pull/3208>
- <https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95>
- <https://github.com/SixLabors/ImageSharp/commit/baa37cd19077b2a2a0c5667535111cf31d48c019>
- <https://github.com/SixLabors/ImageSharp>
- <https://github.com/SixLabors/ImageSharp/releases/tag/v3.2.0>
- <https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-jjfr-hcj7-qf5w>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-jjfr-hcj7-qf5w/>. Everything for agents: <https://agentprime.io/llms.txt>.