Vulnerability details
CVE-2025-68121
Go standard library crypto/tls
Unexpected session resumption in crypto/tls
CVSS 3.1
9.1Critical
Official description
During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Go standard library | crypto/tls | v < 1.24.13 | CVEProject cvelistV5 (CNA) |
| Go standard library | crypto/tls | 1.25.0-0 ≤ v < 1.25.7 | CVEProject cvelistV5 (CNA) |
| Go standard library | crypto/tls | 1.26.0-rc.1 ≤ v < 1.26.0-rc.3 | CVEProject cvelistV5 (CNA) |
References and advisories
4
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Details
- Published
- 2026-02-05
- Last updated
- 2026-04-29
- State
- Published
- Assigner (CNA)
- Go
Exploit prediction (EPSS)
0.9%
Probability of exploitation in 30 days
59.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-295Improper Certificate Validation