CVE-2026-111618: CoAI through 4.0.0 Unauthenticated Path Traversal via Archive Download Endpoints

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-23
Weakness: CWE-22

Description

CoAI (Chat Nio) through 4.0.0 contains an unauthenticated path traversal vulnerability in the generation and article archive download endpoints via the hash query parameter. Attackers can supply ../ sequences in hash to download any readable .tar.gz or .zip file, including other users' generated archives.

Affected products

coaidev CoAI: through 4.0.0

References

https://github.com/coaidev/coai/blob/v4.0.0/addition/article/api.go#L25-L35
https://github.com/coaidev/coai/blob/v4.0.0/addition/generation/api.go#L19-L29
https://hackmd.io/@hieuPenguinnn/coai-chatnio-generation-article-download-path-traversal
https://www.vulncheck.com/advisories/coai-through-4.0.0-unauthenticated-path-traversal-via-archive-download-endpoints
https://hackmd.io/@hieuPenguinnn/coai-chatnio-generation-article-download-path-traversal

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