CVE-2026-34873
mbedtls: An issue was discovered in Mbed TLS 3.5.0 through 4.0.0
CVE-2026-34873 is fixed in mbedtls on 1 platform, first by DEBIAN-CVE-2026-34873, released April 1, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Urgent
CVSS
9.1
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0025
16th percentile
An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mbedtls · Debian 13.5 (trixie) | 3.6.6-0.1~deb13u1 | DEBIAN-CVE-2026-34873 | Apr 1, 2026 |
| mbedtls · Debian 14 | 3.6.6-0.1 | DEBIAN-CVE-2026-34873 | Apr 1, 2026 |
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