Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via Debug

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123609
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-08 02:16:56 UTC
Updated2026-11-10 18:17:27 UTC
DescriptionRustls 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.

Risk And Classification

Primary CVSS: v4.0 4.1 MEDIUM from [email protected]

CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001010000 probability, percentile 0.009010000 (date 2026-11-09)

Problem Types: CWE-212 | CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary4.1MEDIUMCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS4.1MEDIUMCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
3.1[email protected]Secondary4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
3.1CNACVSS4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Attack Requirements
Present
Privileges Required
High
User Interaction
Passive
Confidentiality
High
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rustls Rustls affected 0.23.46 semver Not specified
CNA Rustls Rustls unaffected 0.23.46 semver Not specified
CNA Rustls Rustls affected 0.24.0-dev.1 0.24.0-dev.2 semver Not specified
CNA Rustls Rustls unaffected 0.24.0-dev.2 semver Not specified

References

ReferenceSourceLinkTags
www.vulncheck.com/advisories/rustls-before-0.23.46-and-0.24.0-dev.1-before-0.24... [email protected] www.vulncheck.com
github.com/rustls/rustls/security/advisories/GHSA-c8m5-c952-6cm4 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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