| Name | CVE-2026-34873 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1132577 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| mbedtls (PTS) | bookworm | 2.28.3-1 | vulnerable |
| trixie | 3.6.6-0.1~deb13u1 | fixed |
| forky, sid | 3.6.7-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| mbedtls | source | trixie | 3.6.6-0.1~deb13u1 | | | |
| mbedtls | source | (unstable) | 3.6.6-0.1 | | | 1132577 |
Notes
[bookworm] - mbedtls <no-dsa> (Minor issue)
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-client-impersonation-while-resuming-tls13-session/