Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
n/a sjcl — Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curv…
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N N N H N N 7.7 .0025 16.1 —
AFFECTED
Product Versions Fixed
sjcl unspecified —
org.webjars.npm:sjcl unspecified —
TIMELINE
Mar 16 Reserved by snyk
Mar 17 Published (CNA: snyk)
Jul 28 EXPLOIT PUBLISHED — CVE-2026-4258 (sjcl). Public exploit reference added.
Jul 28 RESCORED — CVE-2026-4258 (sjcl). CVSS 8.7 → 7.7 (NVD).
Description
Versions of the package sjcl before 1.0.9 are vulnerable to Improper Verification of Cryptographic Signature due to missing point-on-curve validation in sjcl.ecc.basicKey.publicKey(). An attacker can recover a victim's ECDH private key by sending crafted off-curve public keys and observing ECDH outputs. The dhJavaEc() function directly returns the raw x-coordinate of the scalar multiplication result (no hashing), providing a plaintext oracle without requiring any decryption feedback.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| March 16, 2026 | Reserved | Reserved by snyk |
| March 17, 2026 | Published | Published (CNA: snyk) |
| July 28, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-4258 (sjcl). Public exploit reference added. |
| July 28, 2026 | RESCORED | RESCORED — CVE-2026-4258 (sjcl). CVSS 8.7 → 7.7 (NVD). |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | sjcl | — | — | — |
| n/a | org.webjars.npm:sjcl | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-4258 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.