Improper Certificate Validation Affecting rust-rustls-webpki package, versions *


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.18% (9th percentile)

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  • Snyk IDSNYK-ECHOLATEST-RUSTRUSTLSWEBPKI-19946245
  • published19 Sept 2026
  • disclosed18 Sept 2026

Introduced: 18 Sep 2026

NewCVE-2026-93600  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest rust-rustls-webpki.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-rustls-webpki package and not the rust-rustls-webpki package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.

CVSS Base Scores

version 3.1