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Vulnerabilities

Vulnerability · RUSTSEC-2026-0346

impls for client session values expose TLS secrets

Published Oct 14, 2026 · catalog updated Oct 14, 2026 · RustSec Rust

Open the advisory

Exploitation likelihood is not on this record for RUSTSEC-2026-0346. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Medium4.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
crates.io rustls

The implementations of and were derived, and so included the TLS 1.2 master secret or TLS 1.3 resumption PSK in their output. Custom implementations that format these values with (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 output is redacted and is not affected.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • crates.io rustls0.21.0 → 0.23.46

How to fix RUSTSEC-2026-0346

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for RUSTSEC-2026-0346. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0.21.0 → 0.23.46. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · GitHub Advisory Database

    Detected

    The implementations of and were derived, and so included the TLS 1.2 master secret or TLS 1.3 resumption PSK in their output. Custom implementations that format these values with (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/

  2. Oct 14, 2026 · GitHub Advisory Database

    Fix available

    rustls fixed in 0.23.46

  3. Oct 14, 2026 · GitHub Advisory Database

    Fix available

    rustls fixed in 0.23.46

  4. Oct 14, 2026 · GitHub Advisory Database

    Updated

    The implementations of and were derived, and so included the TLS 1.2 master secret or TLS 1.3 resumption PSK in their output. Custom implementations that format these values with (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/

Sources

  • GitHub Advisory DatabasePackage advisoryGHSA-c8m5-c952-6cm4

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • OpenSSF OSV / OSV ScannerPackage advisoryRUSTSEC-2026-0346

    impls for client session values expose TLS secrets

    osv.dev
  • RustSec Advisory DBVendor advisoryRUSTSEC-2026-0346

    The implementations of and were derived, and so included the TLS 1.2 master secret or TLS 1.3 resumption PSK in their output. Custom implementations that format these values with (for example, when logging) could disclose these secrets to readers of the logs. This conflicts with

    crates.io

References

Freshness

Last verified in this catalog Oct 14, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.