DEBIAN-CVE-2026-34876
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-34876
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34876.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-34876
- Upstream
- Published
- 2026-04-02T16:16:26Z
- Modified
- 2026-09-14T17:03:30Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Debian:12 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source&distro=trixie
Debian:14 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source&distro=forky