blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when…
Priority LOW 36CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space to write compressed data.
Why it matters now
EPSS 0.01201 68th percentileScored 2026-11-07
Fix Partial blosc2 (PyPI): 0.1.7Red Hat: 3 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | blosc2 (PyPI) | before 0.1.7 | 0.1.7 | Patch available | GHSA-8c7c-2c8j-3xfp |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- blosc2 (PyPI) Vendor— Affected before 0.1.7 Fixed in 0.1.7 Patch available GHSA-8c7c-2c8j-3xfp
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha2:*:*:*:*:*:* | 2.0.0 alpha2 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha3:*:*:*:*:*:* | 2.0.0 alpha3 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha4:*:*:*:*:*:* | 2.0.0 alpha4 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha5:*:*:*:*:*:* | 2.0.0 alpha5 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:beta1:*:*:*:*:*:* | 2.0.0 beta1 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:beta2:*:*:*:*:*:* | 2.0.0 beta2 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:beta3:*:*:*:*:*:* | 2.0.0 beta3 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:beta4:*:*:*:*:*:* | 2.0.0 beta4 | Vulnerable | Blosc |
| cpe:2.3:a:blosc:c-blosc2:2.0.0:beta5:*:*:*:*:*:* | 2.0.0 beta5 | Vulnerable | Blosc |
- cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha2:*:*:*:*:*:* Versions 2.0.0 alpha2 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha3:*:*:*:*:*:* Versions 2.0.0 alpha3 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha4:*:*:*:*:*:* Versions 2.0.0 alpha4 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:alpha5:*:*:*:*:*:* Versions 2.0.0 alpha5 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:beta1:*:*:*:*:*:* Versions 2.0.0 beta1 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:beta2:*:*:*:*:*:* Versions 2.0.0 beta2 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:beta3:*:*:*:*:*:* Versions 2.0.0 beta3 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:beta4:*:*:*:*:*:* Versions 2.0.0 beta4 Vulnerable ·Blosc
- cpe:2.3:a:blosc:c-blosc2:2.0.0:beta5:*:*:*:*:*:* Versions 2.0.0 beta5 Vulnerable ·Blosc
Remediation
- Fix · GHSA-8c7c-2c8j-3xfp blosc2 (PyPI) Fixed in 0.1.7 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 4 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 16.1 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-29367
- 2026-10-03 Alias added: GHSA-8c7c-2c8j-3xfp
References
Advisory 2
More Blosc C-blosc2 vulnerabilities
- TI-2024-03004 c-blosc2 ndlz4x4.c ndlz4_decompress heap-based overflow CVSS 3.1CRITICAL 9.8
- TI-2024-03003 c-blosc2 ndlz8x8.c ndlz8_decompress heap-based overflow CVSS 3.1CRITICAL 9.8
- TI-2023-18819 C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the… CVSS 3.1HIGH 7.5
- TI-2023-18822 C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the… CVSS 3.1HIGH 7.5
- TI-2023-18821 C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the… CVSS 3.1HIGH 7.5
- TI-2023-18820 C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference in… CVSS 3.1HIGH 7.5
Sources
- CVE-2020-29367 · CVE Program
- CVE-2020-29367 · NVD
- FIRST EPSS
- GHSA-8c7c-2c8j-3xfp · GitHub Advisory Database · CC BY 4.0
- CVE-2020-29367 · Red Hat security data · CC BY 4.0
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