{
  "cveId": "CVE-2026-77696",
  "url": "https://patchblox.com/security/cve/CVE-2026-77696",
  "summary": "CVE-2026-77696 is fixed in 8 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3.6, released September 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Timing Side-Channel in SM2 Signature Generation",
  "description": "Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel.  Impact summary: An attacker able to measure SM2 signing times may learn information about the per-signature secret nonce, which over many signatures can, via a lattice / Hidden Number Problem attack, lead to recovery of the private key.  CWE: CWE-208: Observable Timing Discrepancy  Description: SM2 signature generation computes the signature value using variable-time BIGNUM operations on the secret nonce and the private key, so the time taken to produce an SM2 signature depends on these secret values, forming a timing side-channel.  Applications performing SM2 signature generation are affected on all platforms.  FIPS Impact: no SM2 is not a FIPS algorithm.",
  "published": "2026-09-28T17:00:00Z",
  "severity": "Low",
  "cvss": 3.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
  "cwe": "Observable Timing Discrepancy",
  "epss": 0.00396,
  "epssPercentile": 0.34076,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77696",
  "fixes": [
    {
      "platform": "linux",
      "product": "libssl1.0.0",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.2n-1ubuntu5.13\u002Besm7",
      "fix": "libssl1.0.0 1.0.2n-1ubuntu5.13\u002Besm7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.13-esm7",
      "released": "2026-10-01T20:52:35Z"
    },
    {
      "platform": "linux",
      "product": "libssl1.1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.1.1-1ubuntu2.1~18.04.23\u002Besm11",
      "fix": "libssl1.1 1.1.1-1ubuntu2.1~18.04.23\u002Besm11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.23-esm11",
      "released": "2026-10-01T20:52:35Z"
    },
    {
      "platform": "linux",
      "product": "libssl1.1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.1.1f-1ubuntu2.24\u002Besm6",
      "fix": "libssl1.1 1.1.1f-1ubuntu2.24\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.24-esm6",
      "released": "2026-10-01T20:52:37Z"
    },
    {
      "platform": "linux",
      "product": "libssl3",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.2-0ubuntu1.30",
      "fix": "libssl3 3.0.2-0ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.30",
      "released": "2026-09-30T20:39:35Z"
    },
    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.0.13-0ubuntu3.16",
      "fix": "libssl3t64 3.0.13-0ubuntu3.16",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.16",
      "released": "2026-09-30T20:39:35Z"
    },
    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "libssl3t64 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libssl3t64-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "3.0.22-1~deb12u2",
      "fix": "DEBIAN-CVE-2026-77696",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77696",
      "released": "2026-09-30T20:39:22Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "3.5.7-1~deb13u3",
      "fix": "DEBIAN-CVE-2026-77696",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77696",
      "released": "2026-09-30T20:39:22Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 14",
      "fixedVersion": "3.6.5-1",
      "fix": "DEBIAN-CVE-2026-77696",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77696",
      "released": "2026-09-30T20:39:22Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.1.1-1ubuntu2.1~18.04.23\u002Besm11",
      "fix": "openssl 1.1.1-1ubuntu2.1~18.04.23\u002Besm11",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.23-esm11",
      "released": "2026-10-01T20:52:35Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.1.1f-1ubuntu2.24\u002Besm6",
      "fix": "openssl 1.1.1f-1ubuntu2.24\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.24-esm6",
      "released": "2026-10-01T20:52:37Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.2-0ubuntu1.30",
      "fix": "openssl 3.0.2-0ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.30",
      "released": "2026-09-30T20:39:35Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.0.13-0ubuntu3.16",
      "fix": "openssl 3.0.13-0ubuntu3.16",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-openssl-3.0.13-0ubuntu3.16",
      "released": "2026-09-30T20:39:35Z"
    },
    {
      "platform": "linux",
      "product": "openssl",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "openssl 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-openssl-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.5.0-160000.11.1",
      "fix": "OPENSUSE-SU-2026:22102-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22102-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "sles 15.6",
      "fixedVersion": "3.1.4-150600.5.67.1",
      "fix": "SUSE-SU-2026:4419-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4419-1",
      "released": "2026-10-02T10:23:34Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "sles 15.7",
      "fixedVersion": "3.5.0-150700.5.53.2",
      "fix": "SUSE-SU-2026:4414-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4414-1",
      "released": "2026-10-02T07:37:31Z"
    },
    {
      "platform": "linux",
      "product": "openssl-3",
      "release": "sles 16.0",
      "fixedVersion": "3.5.0-160000.11.1",
      "fix": "SUSE-SU-2026:24245-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24245-1",
      "released": "2026-11-07T00:45:20Z"
    },
    {
      "platform": "linux",
      "product": "openssl-provider-legacy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.5.5-1ubuntu3.6",
      "fix": "openssl-provider-legacy 3.5.5-1ubuntu3.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-openssl-provider-legacy-3.5.5-1ubuntu3.6",
      "released": "2026-09-28T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "openssl1.0",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.2n-1ubuntu5.13\u002Besm7",
      "fix": "openssl1.0 1.0.2n-1ubuntu5.13\u002Besm7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.13-esm7",
      "released": "2026-10-01T20:52:35Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}