Kong Gateway Enterprise: Cache key collision in proxy-cache plugins
Summary
The proxy-cache and proxy-cache-advanced plugins in Kong Gateway Enterprise and Kong AI Gateway do not escape separator characters when building the cache key. A remote attacker can cause a response cached for one request to be served for a different request on the same Route. This requires a Route with caching enabled and specific conditions; the CNA score is 6.3 (CVSS 4.0, Medium) with low integrity and availability impact.
Affected
- Kong Gateway Enterprise: 3.10.0.0 to before 3.10.0.20
- Kong Gateway Enterprise: 3.13.0.0 to before 3.13.0.12
- Kong Gateway Enterprise: 3.14.0.0 to before 3.14.0.17
- Kong Gateway Enterprise: 3.15.0.0 to before 3.15.0.7
- Kong Gateway Enterprise: 3.16.0.0 to before 3.16.0.2
- Kong AI Gateway: 2.2.0 to before 2.2.1
Fixed in
- Kong Gateway Enterprise: 3.10.0.20, 3.13.0.12, 3.14.0.17, 3.15.0.7, 3.16.0.2 (versions per CNA record; confirm the exact build per branch in the Kong changelog)
- Kong AI Gateway: 2.2.1 (per CNA record)
Workaround
- No vendor-published workaround. Unknown.
- Until patched, consider disabling proxy-cache and proxy-cache-advanced on sensitive Routes (own mitigation, not from the vendor).
Exploitation
- Not listed in the CISA KEV catalog at the time of research.
- No public exploit code found in the sources checked.
- Unknown whether real-world abuse has occurred.
Our recommendation
- Inventory all Kong Gateway Enterprise and Kong AI Gateway instances and check whether proxy-cache or proxy-cache-advanced is enabled on internet-facing Routes.
- Upgrade to the fixed versions; include the related CVEs CVE-2026-92545 and CVE-2026-92443 in the same update.
- If an upgrade cannot be done immediately, disable caching on sensitive Routes.
- Monitor logs for unexpected cache hits.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE record (CNA) www.cve.org
- Kong Gateway changelog developer.konghq.com
- Kong AI Gateway changelog developer.konghq.com
- OffSeq: CVE-2026-92558 overview radar.offseq.com
- OffSeq: exploitation status radar.offseq.com
- TheHackerWire: CVE-2026-92558 www.thehackerwire.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 13:56.
Original description (NVD)
The proxy-cache and proxy-cache-advanced plugins in Kong Gateway Enterprise and Kong AI Gateway do not escape separator characters when building the cache key, allowing a remote attacker to cause a response cached for one request to be served for a different request on the same Route.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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