CVE-2026-26365

Severity: medium (CVSS 4.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-23 · updated 2026-06-17
Weakness: CWE-444

Description

Akamai Ghost on Akamai CDN edge servers before 2026-02-06 mishandles processing of custom hop-by-hop HTTP headers, where an incoming request containing the header "Connection: Transfer-Encoding" could result in a forward request with invalid message framing, depending on the Akamai processing path. This could result in the origin server parsing the request body incorrectly, leading to HTTP request smuggling.

Affected products

Akamai Ghost: before 2026-02-06 — fixed in 2026-02-06

How to fix

Upgrade to a fixed version: Akamai Ghost 2026-02-06. Check the vendor advisory for mitigations.

References

https://www.akamai.com/blog/security-research/cve-2026-26365-incorrect-processing-connection-transfer-encoding

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