CVE-2026-11703Network attack vector

Cross-host authentication reuse via unbound session resumption

Published Jun 25, 2026 · Updated Jun 25, 2026

Improper authentication in wolfSSL 3.15.0 through 5.9.1 allows remote authenticated users to reuse peer identity across TLS virtual hosts. Stateful session-ID resumption accepts a cached session without binding its original SNI and ALPN values to the new handshake, unlike ticket resumption. Exploitation requires a reusable authenticated session and differing client-authentication policies, enabling cached peer-authentication state to cross host or protocol contexts.

CVSS severity6.0
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in wolfSSL 3.15.0 through 5.9.1 allows remote authenticated users to reuse peer identity across TLS virtual hosts. Stateful session-ID resumption accepts a cached session without binding its original SNI and ALPN values to the new handshake, unlike ticket resumption. Exploitation requires a reusable authenticated session and differing client-authentication policies, enabling cached peer-authentication state to cross host or protocol contexts.

The record

CVE
CVE-2026-11703
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-287, T1550
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.15.0 <=5.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

wolfSSL · wolfSSLversion=3.15.0 <=5.9.1

Published CVSS scores

6.0wolfSSL Inc.CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1550Use Alternate Authentication Material

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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