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

Status: published. Published: 2026-10-30. Updated: 2026-11-04.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://projects.blender.org/blender/blender/pulls/164279
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: disclosure@vulncheck.com) — https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: disclosure@vulncheck.com) — https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: disclosure@vulncheck.com) — https://projects.blender.org/blender/blender/pulls/164279

## Affected products and versions

- Blender Foundation / Blender: ≥ 0; < 4.5.15 (affected, semver); ≥ 5.0.0; < 5.2.3 (affected, semver). Source: CNA: VulnCheck

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:blender:blender:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "4.5.15",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:blender:blender:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.2.3",
            "versionStartIncluding": "5.0.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 4.0: 8.5 (high); 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; source: CNA: VulnCheck

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.5 (high); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-04; percentile 4.80%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-190

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://projects.blender.org/blender/blender/pulls/164279 (CNA: VulnCheck; patch)

- https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08 (CNA: VulnCheck; patch)

- https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97 (CNA: VulnCheck; patch)

- https://projects.blender.org/blender/blender (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction (CNA: VulnCheck; third-party-advisory)

- https://projects.blender.org/blender/blender (disclosure@vulncheck.com; Product)

- https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97 (disclosure@vulncheck.com; Patch)

- https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08 (disclosure@vulncheck.com; Patch)

- https://projects.blender.org/blender/blender/pulls/164279 (disclosure@vulncheck.com; Issue Tracking, Patch)

- https://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction (disclosure@vulncheck.com; Third Party Advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-119719; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119719; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119719; retrieved 2026-11-04; source updated Not reported

Revision: 23bedc673592189a5602bae59831af81e418ed3d541198300caa8918a17e88fa

Canonical: https://y2.dev/cve/CVE-2026-119719

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