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Vulnerabilities / CVE-2026-34873

critical

CVE-2026-34873

mbedtls: Mbed TLS: Client impersonation during TLS 1.3 session resumption

Published Modified CWE 287
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

Red Hat10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by Red Hat.

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.

Affected packages and fixed versions

SourcePackageFixed in
debian 11mbedtlsno fix listed
debian 12mbedtlsno fix listed
debian 13mbedtls3.6.6-0.1~deb13u1
debian 14mbedtls3.6.6-0.1
echombedtls3.6.6
rapidfort debian 12mbedtls, rf-mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort debian 13mbedtls, rf-mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort fedora 43mbedtls, mbedtls-devel, mbedtls-doc3.6.6-1.fc43
rapidfort Oracle Linux 10mbedtls, mbedtls-devel, mbedtls-doc3.6.6-1.el10_3
root.io debian 12mbedtls, rootio-mbedtls2.28.3-1.root.io.16
Show all 17 entries from 10 sources
SourcePackageFixed in
debian 11mbedtlsno fix listed
debian 12mbedtlsno fix listed
debian 13mbedtls3.6.6-0.1~deb13u1
debian 14mbedtls3.6.6-0.1
echombedtls3.6.6
rapidfort debian 12mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort debian 12rf-mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort debian 13mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort debian 13rf-mbedtls0:3.6.6-0.1, 0:3.6.6-0.1~deb13u1
rapidfort fedora 43mbedtls3.6.6-1.fc43
rapidfort fedora 43mbedtls-devel3.6.6-1.fc43
rapidfort fedora 43mbedtls-doc3.6.6-1.fc43
rapidfort Oracle Linux 10mbedtls3.6.6-1.el10_3
rapidfort Oracle Linux 10mbedtls-devel3.6.6-1.el10_3
rapidfort Oracle Linux 10mbedtls-doc3.6.6-1.el10_3
root.io debian 12mbedtls2.28.3-1.root.io.16
root.io debian 12rootio-mbedtls2.28.3-1.root.io.16

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.