Out-of-bounds Read Affecting mbedtls package, versions [3.1.0,3.6.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-MBEDTLS-15929023
- published8 Apr 2026
- disclosed2 Apr 2026
- creditEva Crystal
Introduced: 2 Apr 2026
NewCVE-2026-34876 (opens in a new tab)How to fix?
Upgrade mbedtls to version 3.6.6 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the mbedtls_ccm_finish() function when the multipart CCM API is invoked with an oversized tag_len parameter. An attacker can access adjacent CCM context data by supplying a tag_len value that exceeds the size of the internal authentication buffer.