CVE-2026-92790
Higress before 2.2.4 Rate Limit Bypass via Malformed Cookie Header
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 16, 2026
Description
Higress before 2.2.4 panics when processing a Cookie header segment without an equals sign, causing the plugin wrapper to recover and return a continue action that bypasses AI token rate limiting. Unauthenticated attackers can craft a malformed Cookie header to skip rate limit checks and exceed thresholds intended to restrict costly model backend calls.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-703 Improper Check or Handling of Exceptional Conditions
Affected Products
| Product | Versions |
|---|---|
higresshigress-group |
|
References
- GitHub Issue #4599issue-tracking
- https://github.com/higress-group/higressproduct
- ExtractCookieValueByKey indexes kv[1] without checking the split lengthtechnical-description
- 2.2.4 uses SplitN with a length guardpatch
- VulnCheck Advisory: Higress before 2.2.4 Rate Limit Bypass via Malformed Cookie Headerthird-party-advisory
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