CVE-2026-10512Network attack vector

Wrong X25519 shared secret via unmasked top bit

Published Jun 25, 2026 · Updated Jun 25, 2026

Incorrect calculation in wolfSSL 5.6.4 through 5.9.1 allows remote authenticated users to derive a wrong X25519 shared secret. The x64 and AVX2 final-reduction routines propagate a carry into bit 255 but fail to mask the high limb, leaving a non-canonical field element. Reachability requires an x86_64 build with the Intel assembly path enabled and inputs that trigger the final carry.

CVSS severity2.3
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect calculation in wolfSSL 5.6.4 through 5.9.1 allows remote authenticated users to derive a wrong X25519 shared secret. The x64 and AVX2 final-reduction routines propagate a carry into bit 255 but fail to mask the high limb, leaving a non-canonical field element. Reachability requires an x86_64 build with the Intel assembly path enabled and inputs that trigger the final carry.

The record

CVE
CVE-2026-10512
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-682
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.6.4 <=5.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

wolfSSL · wolfSSLversion=5.6.4 <=5.9.1

Published CVSS scores

2.3wolfSSL Inc.CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-682Incorrect Calculation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo