CVE-2026-32877— Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field
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I. Basic Information for CVE-2026-32877
Vulnerability Information
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Vulnerability Title
Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field
Source: NVD (National Vulnerability Database)
Vulnerability Description
Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
Botan 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Botan是Jack Lloyd个人开发者的一个C++加密库。 Botan 2.3.0至3.11.0之前版本存在缓冲区错误漏洞，该漏洞源于SM2解密过程中未检查认证码值的预期长度，可能导致堆过度读取，引发崩溃或其他未定义行为。
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
II. Public POCs for CVE-2026-32877
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Same Patch Batch · randombit · 2026-03-30 · 3 CVEs total
| CVE-2026-32883 | 5.9 MEDIUM | Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Byp |
| CVE-2026-32884 | 5.9 MEDIUM | Botan: Case-Insensitive CN Values Bypass DNS excludedSubtrees Name Constraints (RFC 5280 V |
IV. Related Vulnerabilities
Same product: botan
- CVE-2026-34582
Botan has a TLS 1.3 certificate authentication bypass - CVE-2026-34580
Botan has a certificate authentication bypass due to trust a - CVE-2026-32883
Botan: Missing OCSP Response Signature Verification Allows M - CVE-2026-32884
Botan: Case-Insensitive CN Values Bypass DNS excludedSubtree - CVE-2024-39312
Botan has an Authorization Error due to Name Constraint Deco
Same vendor: randombit
- CVE-2026-34582
Botan has a TLS 1.3 certificate authentication bypass - CVE-2026-34580
Botan has a certificate authentication bypass due to trust a - CVE-2026-32883
Botan: Missing OCSP Response Signature Verification Allows M - CVE-2026-32884
Botan: Case-Insensitive CN Values Bypass DNS excludedSubtree - CVE-2024-39312
Botan has an Authorization Error due to Name Constraint Deco
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2026-32877
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