Medium severity · published Oct 12, 2026
CVE-2026-109295
Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
0.11.0 before 0.11.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109295
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109295
vendor-advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r
third-party-advisory
https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-redos-via-grep-knowledge-files-event-loop
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