CVE-2026-34876
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I. Basic Information for CVE-2026-34876
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 vendor: n/a
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Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service
V. Comments for CVE-2026-34876
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