TI-2026-30564 Aliases CVE-2026-42248 GHSA-5fjh-wjgp-25ph

Missing Signature Verification for Updates in Ollama

LOW 37CWE-494Published 2026-04-29 · Updated 2026-04-29

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-494.

Summary

Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later executed by the application. Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness. Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00733 54th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ollama	Ollama	0.12.10 – 0.17.5	—	No fix listed	CNA

Ollama Vendorollama Affected 0.12.10 – 0.17.5 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:ollama:ollama::::::::	0.12.10 – 0.17.5	Vulnerable	ollama
cpe:2.3:o:microsoft:windows:-:::::::*	not specified by NVD	Running on	Microsoft

cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:* Versions 0.12.10 – 0.17.5 Vulnerable ·ollama
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-42248
2026-10-03 Alias added: GHSA-5fjh-wjgp-25ph

References

Advisory 1

https://cert.pl/en/posts/2026/04/CVE-2026-42248/

Other 1

https://ollama.com/

TI-2024-24572 Ollama before 0.1.34 does not validate the format of the digest (sha256 with 64 hex… CVSS 3.1HIGH 8.8
TI-2025-14153 Ollama Multi-Modal Model Image Processing NULL Pointer Dereference CVSS 4.0HIGH 8.7
TI-2024-26641 An issue was discovered in Ollama before 0.1.46. CVSS 3.1HIGH 8.2
TI-2025-41098 An issue in ollama v.0.12.10 allows a remote attacker to cause a denial of service via… CVSS 3.1HIGH 7.5
TI-2025-41097 An issue in ollama v.0.12.10 allows a remote attacker to cause a denial of service via the GGUF decoder CVSS 3.1HIGH 7.5
TI-2025-01720 Improper Validation of Array Index in ollama/ollama CVSS 3.0HIGH 7.5

See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences