---
id: "CVE-2026-119721"
kind: "vulnerability"
aliases: ["CVE-2026-119721"]
title: "Blender: crafted .blend file reads past heap buffer in file loader"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["3d-pipelines", "blender", "desktop-apps", "package"]
not_affected_if: ["blender-current-version", "only-internal-files"]
published_at: "2026-10-30T16:17:55+00:00"
first_seen_at: "2026-10-30T16:31:27+00:00"
updated_at: "2026-10-30T16:32:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119721", "first_seen_at": "2026-10-30T16:31:27+00:00"}]
---

# Blender: crafted .blend file reads past heap buffer in file loader

Blender's file reader reads ID fields from short blocks without checking their length, so a crafted .blend file can read past the end of a heap buffer. An attacker can use this to crash Blender or disclose heap memory when the file is browsed or appended from.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `blender --version` and compare against the fixed ranges below.
- Check whether any workflow opens or appends .blend files from untrusted sources.

## Fix

- Blender before `4.5.15` to `4.5.15`
- Blender 5.x before `5.2.3` to `5.2.3`

## Timeline

- 2026-10-30T16:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119721

## From the sources

Blender before 4.5.15 and 5.x before 5.2.3 contains an out-of-bounds read vulnerability in blo_bhead_id_* accessors in readfile.cc that read ID fields without block length checks. Attackers can supply a crafted .blend file with short ID blocks that, when browsed or appended from, causes heap over-reads leading to crashes or heap memory disclosure.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_