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CVE-2026-87732

Quick assessment

Affected
OCaml mirage-crypto
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.

在 OCaml 的 mirage-crypto 软件包 2.2.0 版本之前存在一个安全漏洞。该漏洞涉及 和 函数：这两个函数在验证认证标签之前，就已经将解密后的明文写入调用方提供的缓冲区。当遇到伪造的认证标签时，函数虽然会返回 表示认证失败，但目标缓冲区中已经包含了完整的解密明文。这意味着即使认证失败，攻击者仍可能从缓冲区中获取敏感数据，从而构成信息泄露风险。

CVSS 6.2 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-87732

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then compares the tag. On a forged tag, the functions returns false, but the destination buffer already holds the full plaintext.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OCaml mirage-crypto 0 ~ 2.2.0 -

II. Public POCs for CVE-2026-87732

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III. Intelligence Information for CVE-2026-87732

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Other References for CVE-2026-87732 (1)

Same Patch Batch · OCaml · 2026-09-09 · 7 CVEs total

CVE-2026-87734 7.5 HIGH OCaml utcp 0.0.6 前 远程拒绝服务
CVE-2026-87733 6.2 MEDIUM OCaml mirage-crypto-ec 2.2.0前ECDSA签名伪造
CVE-2026-87737 5.9 MEDIUM mirage-crypto-ec 2.4.0前时序侧信道漏洞
CVE-2026-57825 5.7 MEDIUM OCaml opam 2.5.2前沙箱保护绕过漏洞
CVE-2026-87736 4.3 MEDIUM mirage-crypto-ec 2.3.0前 椭圆曲线公钥越界读取
CVE-2026-87735 4.3 MEDIUM ocaml mirage-crypto-pk<2.3.0 异常处理缺陷

IV. Related Vulnerabilities

Same vendor: OCaml
Same weakness: CWE-347

V. Comments for CVE-2026-87732

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