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CVE-2026-123609— Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via Debug

Quick assessment

Affected
rustls rustls
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rustls 0.23.46 之前的版本，以及 0.24.0-dev.1 到 0.24.0-dev.2 之前的版本，存在一个信息泄露漏洞。该漏洞源于客户端会话值的调试（Debug）格式化输出中暴露了密钥材料。任何对 或 进行日志记录的自定义 实现，都可能将 TLS 1.2 主密钥或 TLS 1.3 会话恢复预共享密钥（PSK）泄露给日志读取者。

CVSS 4.0 · Medium
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I. Basic Information for CVE-2026-123609

Vulnerability Information
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Vulnerability Title
Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via Debug
Source: CVE Program / CVE List V5
Vulnerability Description
Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 contains an information disclosure vulnerability where derived Debug formatting of client session values exposes secret key material. Custom ClientSessionStore implementations that log Tls12ClientSessionValue or Tls13ClientSessionValue can leak TLS 1.2 master secrets or TLS 1.3 resumption PSKs to log readers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的不恰当跨边界移除
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustls rustls 0 ~ 0.23.46 -

II. Public POCs for CVE-2026-123609

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III. Intelligence Information for CVE-2026-123609

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Other References for CVE-2026-123609 (2)

Same Patch Batch · rustls · 2026-11-08 · 5 CVEs total

CVE-2026-123613 5.3 MEDIUM Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass
CVE-2026-123610 3.7 LOW rustls before 0.23.46 Denial of Service via Brotli Certificate Decompression
CVE-2026-123611 3.7 LOW rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello
CVE-2026-123612 2.3 LOW rustls 0.23.44 and 0.23.45 ECH Rejection Application Data Disclosure

IV. Related Vulnerabilities

Same product: rustls
Same vendor: rustls
Same weakness: CWE-212