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  4. CVE 2026 123609 rustls before 02346 and 0240 dev1 before 0240
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Back to active CVEs
Medium · CVSS 4.1CVE-2026-123609

Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via DebugCVE-2026-123609

Answer in brief

CVE-2026-123609 records a Medium severity (CVSS 4.1) vulnerability in Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via Debug. The current sources do not mark it as known exploited. The current feed maps rustls/rustls (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps rustls/rustls (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
rustls/rustlsgeneric>=0 <0.23.46 || >=0.24.0-dev.1 <0.24.0-dev.20.23.46, 0.24.0-dev.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for rustls/rustls.
  2. 2Review the reported fix. Update rustls/rustls to 0.23.46 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 8, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • rustls before 0.23.46 Denial of Service via Brotli Certificate DecompressionSame rustls/rustls package
  • rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHelloSame rustls/rustls package
  • rustls 0.23.44 and 0.23.45 ECH Rejection Application Data DisclosureSame rustls/rustls package
  • Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level BypassSame rustls/rustls package

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-212
Source
CVE List V5
Source checked
Nov 8, 2026
References
2 linked sources
Open source record