CVE-2026-32877 is a high-severity vulnerability (CVSS 8.2) affecting the Botan C++ cryptography library, specifically versions 2.3.0 through 3.10.x. This flaw allows a remote, unauthenticated attacker to cause a heap over-read of up to 31 bytes during SM2 decryption by sending an invalid ciphertext. The vulnerability stems from inadequate length validation of the C3 authentication code. This could lead to a denial of service (crash) or other undefined behavior, with a low confidentiality impact. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion regarding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.3.0, < 3.11.0CPE matchmatch criteria | cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.