EUVD-2026-119368Published

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

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cve-program · CVE-2026-123609

Published

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 published: 8 Nov 2026 01:38:34 UTC
Source modified: 10 Nov 2026 17:56:51 UTC
Saved here: 10 Nov 2026 19:21:22 UTC
Source terms: CVE Program Terms of Use

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CVSS 4.0 · 4.1 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

CVSS 3.1 · 4.0 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

euvd · EUVD-2026-119368

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Nov 8, 2026, 1:38:34 AM

dateUpdated: Nov 10, 2026, 5:56:51 PM

1 related source bulletins · separate from aliases

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

CVE-2026-123609

Source published: Nov 8, 2026, 1:38:34 AM (timezone not stated)
Source modified: Nov 10, 2026, 5:56:51 PM (timezone not stated)
Saved here: 14 Nov 2026 11:58:42 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 4.1 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

nvd · CVE-2026-123609

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-212

Original publisher date fields

published: 2026-11-08T02:16:56.083

lastModified: 2026-11-12T20:28:31.817

Source published: 8 Nov 2026 02:16:56 UTC
Source modified: 12 Nov 2026 20:28:31 UTC
Saved here: 14 Nov 2026 12:57:57 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 4.0 · [email protected] · Secondary · 4.1 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 3.1 · [email protected] · Secondary · 4.0 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

osv · GHSA-c8m5-c952-6cm4

Published

### Summary Formatting a client session value with Debug exposes its TLS 1.2 master secret or TLS 1.3 resumption PSK. A custom session store that logs these values can disclose keys to readers of the logs. Ordinary connection and built-in cache diagnostics remain redacted, and the session-store interface already warns that its values are sensitive. ### Details Derived formatters traverse the session's secret-bearing fields. This conflicts with the project's explicit [key-material redaction policy](https://github.com/rustls/rustls/blob/99f2358cae2954837dbb866faf6727de75489ab9/SECURITY.md#boundary-public-api). ### Proof of concept Custom `ClientSessionStore` implementations could leak secret data by using the provided `Tls12ClientSessionValue` or `Tls13ClientSessionValue` in a way that triggers its implementation of the `Debug` trait. ### Impact Such store implementations could leak the master secret for the TLS connection. ### Acknowledgement Thanks to OpenAI [[email protected]](mailto:[email protected]) for the disclosure.

Source published: 27 Oct 2026 16:08:47 UTC
Source modified: 8 Nov 2026 10:55:36 UTC
Saved here: 8 Nov 2026 11:07:08 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

Publisher rating · MODERATE

osv · RUSTSEC-2026-0346

Published

The `Debug` implementations of `Tls12ClientSessionValue` and `Tls13ClientSessionValue` were derived, and so included the TLS 1.2 master secret or TLS 1.3 resumption PSK in their output. Custom `ClientSessionStore` implementations that format these values with `Debug` (for example, when logging) could disclose these secrets to readers of the logs. This conflicts with rustls's [key-material redaction policy](https://github.com/rustls/rustls/blob/99f2358cae2954837dbb866faf6727de75489ab9/SECURITY.md#boundary-public-api). Ordinary connection and built-in session cache `Debug` output is redacted and is not affected.

Source published: 14 Oct 2026 12:00:00 UTC
Source modified: 9 Nov 2026 09:21:20 UTC
Saved here: 9 Nov 2026 10:04:30 UTC
Source terms: OSV · upstream source license applies

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CVSS_V3 · CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N