Medium severity · published Sep 7, 2026
CVE-2026-86289
Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow
4.3
CVSS
0.7%
EPSS
No
On KEV
Description
A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OL
Ollama · Ollama
0.31.0; 0.31.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86289
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86289
github.com
https://github.com/ollama/ollama/
github.com
https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b
github.com
https://github.com/ollama/ollama/issues/17033
github.com
https://github.com/ollama/ollama/pull/17062
github.com
https://github.com/ollama/ollama/releases/tag/v0.31.2-rc1
vuldb.com
https://vuldb.com/cve/CVE-2026-86289
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