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CVE-2026-76234— libcrux before 0.0.6 Cryptographic Implementation Bug Fixes

Quick assessment

Affected
celabshq libcrux-ecdh
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CE Labs libcrux是CE Labs组织的一款形式化验证的密码学库。 CE Labs libcrux 0.0.6之前版本、libcrux-ed25519 0.0.6之前版本和libcrux-psq 0.0.7之前版本存在加密问题漏洞，该漏洞源于加密实现错误，libcrux-ecdh在X25519密钥验证时未正确检查长度和clamping，libcrux-ed25519在密钥生成时重复执行clamping步骤，libcrux-psq发生panic而非传播AEADError。

CVSS 7.5 · High EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1552.005 · Cloud Instance Metadata API

Affected Version Matrix 6

VendorProduct Version RangeStatus
celabshq libcrux-ecdh < 0.0.6 affected
0.0.6 unaffected
celabshq libcrux-ed25519 < 0.0.6 affected
0.0.6 unaffected
celabshq libcrux-psq < 0.0.7 affected
0.0.7 unaffected
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I. Basic Information for CVE-2026-76234

Vulnerability Information
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Vulnerability Title
libcrux before 0.0.6 Cryptographic Implementation Bug Fixes
Source: CVE Program / CVE List V5
Vulnerability Description
libcrux-ecdh and libcrux-ed25519 before 0.0.6, and libcrux-psq before 0.0.7, contain cryptographic implementation bugs. libcrux-ecdh did not properly check length and clamping during X25519 secret validation (and had a broken clamping check for imported X25519 secret keys); libcrux-ed25519 performed a duplicated clamping step during key generation; and libcrux-psq panicked instead of propagating an AEADError. These were fixed in the respective patched releases.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
Vulnerability Title
CE Labs libcrux 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CE Labs libcrux是CE Labs组织的一款形式化验证的密码学库。 CE Labs libcrux 0.0.6之前版本、libcrux-ed25519 0.0.6之前版本和libcrux-psq 0.0.7之前版本存在加密问题漏洞，该漏洞源于加密实现错误，libcrux-ecdh在X25519密钥验证时未正确检查长度和clamping，libcrux-ed25519在密钥生成时重复执行clamping步骤，libcrux-psq发生panic而非传播AEADError。
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
celabshq libcrux-ecdh 0 ~ 0.0.6 -
celabshq libcrux-ed25519 0 ~ 0.0.6 -
celabshq libcrux-psq 0 ~ 0.0.7 -

II. Public POCs for CVE-2026-76234

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: libcrux-ecdh 0.0.5 X25519 secret validation bug confirmed - unclamped and wrong-length secrets accepted, PROOF_f4055944652a194e
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 8024 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-76234

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Vendor Advisories for CVE-2026-76234 (1)

Other References for CVE-2026-76234 (1)

IV. Related Vulnerabilities

Same weakness: CWE-347

V. Comments for CVE-2026-76234

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