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CVE-2026-34876

🗓️ 02 Apr 2026 00:00:00Reported by Debian Security Bug TrackerType 
debiancve
 debiancve🔗 security-tracker.debian.org👁 12 Views

CVE-2026-34876 disclosure in Mbed TLS 3.x before 3.6.6 due to an out-of-bounds access.

Related
Packages
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2026-34876
2 Apr 202600:00
–attackerkb
circl
Circl		CVE-2026-34876
3 Apr 202607:01
–circl
cnnvd
CNNVD		Mbed TLS 安全漏洞
2 Apr 202600:00
–cnnvd
cve
CVE		CVE-2026-34876
2 Apr 202600:00
–cve
cvelist
Cvelist		CVE-2026-34876
2 Apr 202600:00
–cvelist
freebsd
FreeBSD		Mbed TLS -- vulnerabilities
31 Mar 202600:00
–freebsd
euvd
EUVD		EUVD-2026-18356
2 Apr 202618:31
–euvd
nessus
Tenable Nessus		FreeBSD : Mbed TLS -- vulnerabilities (d77bd2f5-34f0-11f1-bc6d-3c7c3fba4204)
11 Apr 202600:00
–nessus
nessus
Tenable Nessus		Linux Distros Unpatched Vulnerability : CVE-2026-34876
4 Apr 202600:00
–nessus
mscve
Microsoft CVE		An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directly by applications. In Mbed TLS 4.x versions prior to the fix, the same missing validation exists in the internal implementation; however, the function is not exposed as part of the public API. Exploitation requires application-level invocation of the multipart CCM API.
7 May 202608:12
–mscve
Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Debian12allmbedtls2.28.3-1mbedtls_2.28.3-1_all.deb
Debian13allmbedtls3.6.5-0.1~deb13u1mbedtls_3.6.5-0.1~deb13u1_all.deb
Debian14allmbedtls3.6.6-0.1mbedtls_3.6.6-0.1_all.deb
Debian999allmbedtls3.6.6-0.1mbedtls_3.6.6-0.1_all.deb

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02 Apr 2026 00:00Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.17.5
EPSS0.0039
SSVC
cve-2026-34876mbed tlsout of boundssecurity flaw
12