CVE-2026-32877— Botan: Heap Buffer Over-read in SM2 Decryption via Undersized C3 Hash Field
Quick assessment
Affected
randombit botan
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.
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。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
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
| # | POC Description | Source Link | Shenlong Link |
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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
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CVE-2026-44378
Botan: Quadratic complexity decoding BER indefinite length e -
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
Same vendor: randombit
-
CVE-2026-44378
Botan: Quadratic complexity decoding BER indefinite length e -
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
Same weakness: CWE-125
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CVE-2026-81858
IBM i is Affected By A Denial of Service Vulnerability in Ho -
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Out-of-bounds read in Progress MarkLogic Server -
CVE-2026-109281
ImageMagick 7.1.0-21 before 7.1.2-32 Heap Buffer Over-Read v -
CVE-2026-109269
ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 Informa -
CVE-2026-109265
ImageMagick 7.1.1-7 before 7.1.2-32 Heap Buffer Over-Read vi
V. Comments for CVE-2026-32877
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