{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-87823", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-09T10:32:34.110Z", "datePublished": "2026-09-09T14:32:43.442Z", "dateUpdated": "2026-09-09T14:32:43.442Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-09T14:32:43.442Z"}, "datePublic": "2026-08-19T00:00:00.000Z", "title": "zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods", "descriptions": [{"lang": "en", "value": "zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, allowing out-of-bounds memory reads via negative or overflowing offsets. Attackers can supply negative offset values near Integer.MIN_VALUE to read unmapped memory, causing JVM termination or extracting arbitrary frame size data from unintended memory locations."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Integer Overflow or Wraparound", "cweId": "CWE-190", "type": "CWE"}]}], "affected": [{"vendor": "luben", "product": "zstd-jni", "collectionURL": "https://repo1.maven.org/maven2/com/github/luben/zstd-jni/", "repo": "https://github.com/luben/zstd-jni", "defaultStatus": "unaffected", "packageURL": "pkg:maven/com.github.luben/zstd-jni", "versions": [{"version": "1.1.1", "lessThan": "1.5.7-14", "status": "affected", "versionType": "custom"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.8, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-jfr6-9xqw-2g2q)"}, {"url": "https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f", "tags": ["patch"], "name": "Fix commit: reject negative offset and size in the three direct-ByteBuffer natives"}, {"url": "https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zstd.c", "tags": ["technical-description"], "name": "Unchecked 32-bit bounds tests at v1.5.7-13"}, {"url": "https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.java", "tags": ["technical-description"], "name": "Native declarations with no Java-side validation at v1.5.7-13"}, {"url": "https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14", "tags": ["release-notes"], "name": "zstd-jni v1.5.7-14 Release Notes"}, {"url": "https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac", "tags": ["technical-description", "patch"], "name": "Commit that introduced the unchecked direct-ByteBuffer size natives (first released in 1.1.1)"}, {"url": "https://github.com/luben/zstd-jni", "tags": ["product"]}, {"name": "VulnCheck Advisory: zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/zstd-jni-1.1.1-through-1.5.7-13-out-of-bounds-read-via-direct-bytebuffer-frame-size-methods"}], "credits": [{"lang": "en", "value": "Yu Bao, PayPal Cyber Security Team", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}, "source": {"discovery": "EXTERNAL"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://repo1.maven.org/maven2/com/github/luben/zstd-jni/", "defaultStatus": "unaffected", "packageURL": "pkg:maven/com.github.luben/zstd-jni", "product": "zstd-jni", "repo": "https://github.com/luben/zstd-jni", "vendor": "luben", "versions": [{"lessThan": "1.5.7-14", "status": "affected", "version": "1.1.1", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, allowing out-of-bounds memory reads via negative or overflowing offsets. Attackers can supply negative offset values near Integer.MIN_VALUE to read unmapped memory, causing JVM termination or extracting arbitrary frame size data from unintended memory locations."}], "id": "CVE-2026-87823", "lastModified": "2026-09-09T15:17:27.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-09-09T15:17:27.583", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.java"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zstd.c"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/zstd-jni-1.1.1-through-1.5.7-13-out-of-bounds-read-via-direct-bytebuffer-frame-size-methods"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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