CVE-2026-34873 is a critical vulnerability affecting Mbed TLS versions 3.5.0 through 4.0.0, allowing client impersonation during TLS 1.3 session resumption. Rated 9.1 CRITICAL, this vulnerability is network-exploitable with low attack complexity and requires no user interaction, potentially leading to high confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed on the CISA KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 3.5.0, < 3.6.6CPE matchmatch criteria | cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:* | ||
>= 4.0.0, < 4.1.0CPE matchmatch criteria | cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
No social media mentions found for this CVE.
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.