173 lines
8.5 KiB
JSON
173 lines
8.5 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-18036",
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"assignerOrgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
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"state": "PUBLISHED",
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"assignerShortName": "bcorg",
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"dateReserved": "2026-07-28T08:28:40.900Z",
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"datePublished": "2026-10-02T07:54:16.063Z",
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"dateUpdated": "2026-10-02T17:42:56.393Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "91579145-5d7b-4cc5-b925-a0262ff19630",
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"shortName": "bcorg",
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"dateUpdated": "2026-10-02T07:54:16.063Z"
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},
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"title": "NTRU leaks private key information by reducing secret values with a non-constant-time integer division",
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-208",
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"description": "CWE-208 Observable Timing Discrepancy",
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"type": "CWE"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "Legion of the Bouncy Castle Inc.",
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"product": "BC-JAVA",
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"platforms": [
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"all"
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],
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"collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/",
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"packageName": "bcprov",
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"repo": "https://github.com/bcgit/bc-java",
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"packageURL": "pkg:maven/org.bouncycastle/bcprov-jdk18on",
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"modules": [
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"core"
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],
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"programFiles": [
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"Polynomial",
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"NTRUSampling"
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],
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"versions": [
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{
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"status": "affected",
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"version": "1.73",
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"lessThan": "1.86",
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"versionType": "maven"
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}
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],
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"defaultStatus": "unaffected"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "In Bouncy Castle for Java before 1.86, NTRU reduced secret values with the % operator in three helpers whose reference implementations are deliberately division-free, so each reduction was carried out by an integer division whose latency depends on the secret operand. Polynomial.modQ divided by a variable divisor, which a compiler cannot strength-reduce to a multiply the way it can a constant one, so it emitted a division on every call including on the decapsulation path where the dividend derives from the private key; Polynomial.mod3 and NTRUSampling.mod3 divided the secret key polynomials f and g during key generation, the message polynomials r and m during encapsulation, and coefficients recovered during decapsulation. An attacker able to measure that timing can recover information about the NTRU private key. modQ now masks, which is exact because q is always a power of two, and mod3 uses the reference implementation's division-free fold and select; the results are unchanged.",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "<p>In Bouncy Castle for Java before 1.86, NTRU reduced secret values with the % operator in three helpers whose reference implementations are deliberately division-free, so each reduction was carried out by an integer division whose latency depends on the secret operand. Polynomial.modQ divided by a variable divisor, which a compiler cannot strength-reduce to a multiply the way it can a constant one, so it emitted a division on every call including on the decapsulation path where the dividend derives from the private key; Polynomial.mod3 and NTRUSampling.mod3 divided the secret key polynomials f and g during key generation, the message polynomials r and m during encapsulation, and coefficients recovered during decapsulation. An attacker able to measure that timing can recover information about the NTRU private key. modQ now masks, which is exact because q is always a power of two, and mod3 uses the reference implementation's division-free fold and select; the results are unchanged.</p>"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9018036",
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"tags": [
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"vendor-advisory"
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]
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},
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{
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"url": "https://github.com/bcgit/bc-java/commit/9c9ad88b6003bb6230d2434bd892cc1e95b294e4",
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"tags": [
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"patch"
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"attackRequirements": "PRESENT",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"exploitMaturity": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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"vulnerabilityResponseEffort": "NOT_DEFINED",
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"providerUrgency": "AMBER",
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"version": "4.0",
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"baseSeverity": "HIGH",
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"baseScore": 8.2,
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"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber"
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}
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "The Robusta team: Deepak Bhargavan Pillai, Anirban Chakraborty, Chitchanok Chuengsatiansup, Matthew Roughan, Peter Schwabe, and Yuval Yarom",
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"type": "reporter"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"x_generator": {
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"engine": "bc release-notes template"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-10-02T17:42:43.345821Z",
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"id": "CVE-2026-18036",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-02T17:42:56.393Z"
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}
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}
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]
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}
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} |