CVE-2025-68121Network attack vector

Authentication bypass via stale session trust state

Published Feb 5, 2026 · Updated Feb 5, 2026

Improper certificate validation in Go crypto/tls allows remote attackers to resume TLS sessions against changed trust settings. Session resumption retains the earlier handshake trust decision instead of rechecking mutated ClientCAs or RootCAs in Config.Clone or GetConfigForClient configurations. Exposure requires an application to change those trust pools between the initial and resumed handshakes, allowing a previously accepted peer to bypass the new trust policy.

CVSS severity10.0
Critical
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Go crypto/tls allows remote attackers to resume TLS sessions against changed trust settings. Session resumption retains the earlier handshake trust decision instead of rechecking mutated ClientCAs or RootCAs in Config.Clone or GetConfigForClient configurations. Exposure requires an application to change those trust pools between the initial and resumed handshakes, allowing a previously accepted peer to bypass the new trust policy.

The record

CVE
CVE-2025-68121
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
Go
Product
crypto/tls
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 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=0 <1.24.13
  2. Affected versionversion=1.25.0-0 <1.25.7
  3. Affected versionversion=1.26.0-rc.1 <1.26.0-rc.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go · crypto/tlsversion=0 <1.24.13; version=1.25.0-0 <1.25.7; version=1.26.0-rc.1 <1.26.0-rc.3

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

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

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Your stack

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