CIRCL's Kyber: timing side-channel (kyberslash2)
Priority LOW 38Published · Updated
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### Impact On some platforms, when an attacker can time decapsulation of Kyber on forged cipher texts, they could possibly learn (parts of) the secret key. Does not apply to ephemeral usage, such as when used in the regular way in TLS. ### Patches Patched in 1.3.7. ### References - [kyberslash.cr.yp.to](https://kyberslash.cr.yp.to/)
Why it matters now
Fix Fixed github.com/cloudflare/circl (Go): 1.3.7
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | github.com/cloudflare/circl (Go) | before 1.3.7 | 1.3.7 | Patch available | GHSA-9763-4f94-gfch |
- github.com/cloudflare/circl (Go) Vendor— Affected before 1.3.7 Fixed in 1.3.7 Patch available GHSA-9763-4f94-gfch
Remediation
- Fix · GHSA-9763-4f94-gfch github.com/cloudflare/circl (Go) Fixed in 1.3.7 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-9763-4f94-gfch
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences