CVE-2026-88002 json
Open WebUI: Any authenticated user can hang the server via a cyclic chat message history
published 2mo ago modified last mo. also EUVD-2026-75188 , GHSA-jqhh-cjmq-vmv6 , PYSEC-2026-3879
- 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
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).
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 Intel 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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.