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CVE-2026-34876

Quick assessment

Affected
n/a n/a
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mbed TLS是Mbed TLS开源的一个开源、可移植、易于使用、可读且灵活的 SSL 库。 Mbed TLS 3.6.6之前版本存在安全漏洞，该漏洞源于mbedtls_ccm_finish函数中tag_len参数缺少验证，可能导致越界读取。

AI Predicted 7.5 Difficulty: Easy EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions
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I. Basic Information for CVE-2026-34876

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mbed TLS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mbed TLS是Mbed TLS开源的一个开源、可移植、易于使用、可读且灵活的 SSL 库。 Mbed TLS 3.6.6之前版本存在安全漏洞，该漏洞源于mbedtls_ccm_finish函数中tag_len参数缺少验证，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- n/a n/a -

II. Public POCs for CVE-2026-34876

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III. Intelligence Information for CVE-2026-34876

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Vendor Advisories for CVE-2026-34876 (1)

Same Patch Batch · n/a · 2026-04-02 · 13 CVEs total

CVE-2026-30332 7.5 HIGH Etcher 安全漏洞
CVE-2026-5344 6.3 MEDIUM Textpattern XML-RPC TXP_RPCServer.php mt_uploadImage path traversal
CVE-2026-5342 5.3 MEDIUM LibRaw TIFF/NEF decoders_libraw.cpp nikon_load_padded_packed_raw out-of-bounds
CVE-2026-5331 4.7 MEDIUM OpenCart Extension Installer installer.php path traversal
CVE-2026-5318 4.3 MEDIUM LibRaw JPEG DHT losslessjpeg.cpp initval out-of-bounds write
CVE-2026-5360 3.7 LOW Free5GC aper type confusion
CVE-2026-25212 Percona PMM 安全漏洞
CVE-2026-26895 osTicket 安全漏洞
CVE-2026-30603 Qianniao QN-L23PA0904 安全漏洞
CVE-2026-34877 Mbed TLS 安全漏洞
CVE-2026-30252 Interzen Consulting ZenShare Suite 安全漏洞
CVE-2026-30251 Interzen Consulting ZenShare Suite 安全漏洞

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2026-34876

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