CVE-2026-123609 json
Rustls before 0.23.46 and 0.24.0-dev.1 before 0.24.0-dev.2 Secret Exposure via Debug
published 28d ago modified yesterday also EUVD-2026-119368 , GHSA-c8m5-c952-6cm4 , RUSTSEC-2026-0346
- cvss
- 4.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 0%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io rustls 0.23.46, 0.24.0-dev.2
- rustls rustls 0.23.46, 0.24.0-dev.2
- github.com/rustls/rustls@dcdb946 commit
- github.com/rustls/rustls@f5f7bf5 commit
- github.com/rustls/rustls#3299 pull request
- github.com/rustls/rustls#3354 pull request
- github.com/rustls/rustls/releases/tag/v/0.23.46 release
Is CVE-2026-123609 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- yesterday
Exploit prediction
0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 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 |
| CNA | 3.1 | 4.0 | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 4.0 | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N |
| CNA | 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/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 |
| OSV | 3.1 | 4.0 | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | rustls | <0.23.46 >=0.24.0-dev.1, <0.24.0-dev.2 >=0.21.0, <0.23.46 |
0.23.46 0.24.0-dev.2 |
Affected products
- rustls rustls
Classification
- Weakness
-
- CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer
References
-
github.com
/rustls/rustls/pull/3299
web
-
github.com
/rustls/rustls/pull/3354
web
-
github.com
/rustls/rustls/commit/dcdb9464d376f45f42a94a5f837cda1506449f23
web
-
github.com
/rustls/rustls/commit/f5f7bf5078a7edcbd81a9e82a97f2bd14dc1c855
web
-
github.com
/rustls/rustls/security/advisories/GHSA-c8m5-c952-6cm4
vendor-advisory, web
-
vulncheck.com
/advisories/rustls-before-0.23.46-and-0.24.0-dev.1-before-0.24.0-dev.2-secret-exposure-via-debug
third-party-advisory
-
github.com
/rustls/rustls
package
-
github.com
/rustls/rustls/releases/tag/v/0.23.46
web
-
rustsec.org
/advisories/RUSTSEC-2026-0346.html
web, advisory
-
crates.io
/crates/rustls
package
Sources
- CVE List CVE-2026-123609
- GitHub Advisory GHSA-c8m5-c952-6cm4
- NVD CVE-2026-123609
- OSV RUSTSEC-2026-0346
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.