How easily can this vulnerability be exploited in real deployments?

Exploitation is straightforward if an attacker can send arbitrary SM2 ciphertext to a vulnerable decrypt() endpoint. By repeatedly sending malformed or undersized inputs, an attacker may consistently trigger panics and cause denial-of-service conditions.

Does an attacker need authenticated access to exploit this?

Not inherently. The key requirement is the ability to supply SM2 ciphertext to the affected decryption logic. In many designs, decryption occurs before or during authentication, so unauthenticated remote clients could potentially trigger the vulnerability if SM2 decryption is exposed.

What is the safest general fix pattern?

The safest pattern is to enforce strict input validation before performing any slice operations based on untrusted data. Ensure that all lengths, offsets, and structural assumptions about ciphertext and DER-encoded fields are checked, and return explicit errors on invalid input rather than panicking.

Severity:

HIGH RISK

(7.5)

Input Validation Flaw (CWE-20) in RustCrypto SM2 Public-Key Decryption

CVE-2026-22700

Published:

Jan 10, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20

Impact:

Denial of Service via Panic/Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20

Impact:

Denial of Service via Panic/Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Input Validation Flaw (CWE-20) in RustCrypto SM2 Public-Key Decryption

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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