Security readout for executives and security teams
Plain-English summary
CVE-2026-22698 weakens encryption in RustCrypto SM2-PKE pre-release packages. A coding mistake makes encryption use far too little randomness, so protected messages may be decryptable from the public key and ciphertext. This matters mainly if your software uses the affected SM2 Rust crate versions.
Executive priority
Prioritize quickly if your products use RustCrypto SM2-PKE. The flaw directly undermines confidentiality, but scope appears narrow to two pre-release crate versions. If not in use, document non-exposure and monitor vendor guidance.
Technical view
RustCrypto elliptic-curves SM2-PKE versions 0.14.0-pre.0 and 0.14.0-rc.0 generate an ephemeral nonce with 32 bits of randomness instead of 256 bits. The advisory describes this as reducing effective security to a practical level for ciphertext decryption. CWE-331 applies. The issue is reported patched in commit e4f7778.
Likely exposure
Exposure is limited to applications or services that depend on RustCrypto SM2-PKE through sm2 0.14.0-pre.0 or 0.14.0-rc.0. Stable versions are not listed as affected in the provided sources.
Exploitation context
The CVSS vector indicates network attackability, low complexity, no privileges, and no user interaction. The source bundle does not cite active exploitation, and KEV is false. Impact is confidentiality-focused: ciphertext confidentiality may fail where affected SM2-PKE encryption was used.
Researcher notes
Focus review on SM2-PKE encryption paths and dependency provenance. The core issue is entropy under-request during nonce generation. Sources name commit e4f7778 as the patch; avoid assuming a fixed crate release unless confirmed by RustCrypto or crates.io.
Mitigation direction
- Inventory Rust projects for sm2 0.14.0-pre.0 or 0.14.0-rc.0 dependencies.
- Move off affected pre-release or release-candidate versions per RustCrypto guidance.
- If pinning source, ensure the fix from commit e4f7778 is included.
- Re-encrypt sensitive data protected with affected versions where business impact warrants it.
Validation and detection
- Review Cargo.lock and dependency manifests for affected sm2 versions.
- Check transitive dependencies with your standard Rust dependency audit tooling.
- Confirm builds use a version or source revision containing the patched nonce fix.
- Identify data encrypted during the affected version deployment window.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-331: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-22698 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/RustCrypto/elliptic-curves/security/advisories/GHSA-w3g8-fp6j-wvqwCVE reference · x_refsource_CONFIRM
- https://github.com/RustCrypto/elliptic-curves/pull/1600CVE reference · x_refsource_MISC
- https://github.com/RustCrypto/elliptic-curves/commit/4781762f23ff22ab34763410f648128055c93731CVE reference · x_refsource_MISC
- https://github.com/RustCrypto/elliptic-curves/commit/e4f77788130d065d760e57fb109370827110a525CVE reference · x_refsource_MISC
- https://crates.io/crates/sm2/0.14.0-pre.0CVE reference · x_refsource_MISC
- https://crates.io/crates/sm2/0.14.0-rc.0CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficient Entropy
Insufficient Entropy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.