🛡️ CVE-2023-29409
🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-400 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-400
Public Exploit ✅ No
Source NVD
Published 2023-08-02
Updated 2026-06-08
Modified 2024-11-21

Affected Packages

Software From version Fixed in
go — —
golang — —
stdlib — —

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