CVE-2026-88002 json
Open WebUI: Any authenticated user can hang the server via a cyclic chat message history
published 2026-09-09 1 mo ago modified 2026-09-14 55 d ago also GHSA-jqhh-cjmq-vmv6 , PYSEC-2026-3879 , EUVD-2026-75188
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.1, the message-chain reconstruction helper in backend/open_webui/utils/misc.py advanced through a chat history by map key but tracked visited entries using each message body's optional id field. An authenticated user could store id-less messages in a parent cycle and trigger a non-terminating walk that blocked the async event loop, grew memory until termination, and remained persistent across process restarts. This issue is fixed in version 0.11.1.
Patch / fix
- pypi open-webui 0.11.1
- openwebui open_webui 0.11.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 55 d ago
Exploit prediction
0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.5.0, <0.11.1 |
0.11.1 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-835 Loop with Unreachable Exit Condition
References
-
github.com
/open-webui/open-webui/pull/28034
web, issue-tracking, patch
-
github.com
/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6
web, exploit, vendor-advisory
-
github.com
/open-webui/open-webui/releases/tag/v0.11.1
web, release-notes
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-jqhh-cjmq-vmv6
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-88002
advisory
Sources
- CVE List CVE-2026-88002
- GitHub Advisory GHSA-jqhh-cjmq-vmv6
- NVD CVE-2026-88002
- OSV PYSEC-2026-3879
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.