CVE-2026-93493CWE-299

CVE-2026-93493

Medium · published September 18, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

A flaw was found in Netty's `netty-handler-ssl-ocsp` component. A remote attacker can exploit this vulnerability by providing an Online Certificate Status Protocol (OCSP) response that omits the optional `nextUpdate` field. This omission causes the OCSP validation to be silently skipped, leading to applications proceeding with an unvalidated certificate. This can result in a bypass of security controls where certificate validation is expected.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00218 · 11.6th percentile
Weakness
CWE-299 · Improper Check for Certificate Revocation
Published
2026-09-18T12:17Z
References (2)
https://access.redhat.com/security/cve/CVE-2026-93493 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2536897 · [email protected]
EPSS history
Timeline
  • 19 SEP 03:55Z
    EPSS moved — → 0%
    epss
  • 18 SEP 08:01Z
    Netty: netty-handler-ssl-ocsp: io.netty/netty-handler-ssl-ocsp: netty: ocsp validation silently skipped when a response omits the optional nextupdate field
    cvelistv5