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Medium 5.3Published Jul 8, 2026
CVE-2026-42505Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.
Updated under an hour ago ()
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It affects golang go. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-201
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
golang go golang:go | from 1.23.0 before 1.25.12; from 1.26.0 before 1.26.5; 1.27 | NVD |
References
- https://go.dev/cl/775960patch
- https://go.dev/issue/79282issue-tracking, patch
- https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Scmailing-list, release-notes, vendor-advisory
- https://pkg.go.dev/vuln/GO-2026-5856vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.