EUVD-2026-75023
GHSA-9p7w-x2w6-p34j
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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
AV:L because exploitation occurs within the JVM process; AC:L because dictionary close before stream read is deterministically triggerable; no confidentiality impact as freed memory access produces corruption, not disclosure.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
zstd-jni before 1.5.7-14 contains a use-after-free vulnerability where streams and contexts hold a dictionary's shared lock only during the load call, allowing the dictionary to be closed while still referenced. Attackers can close a dictionary after associating it with a stream or context, causing subsequent read or write operations to access freed native memory, resulting in silent data corruption or JVM crashes.
AnalysisAI
Use-after-free in zstd-jni versions 1.3.8-4 through 1.5.7-13 allows attackers to trigger silent data corruption or JVM crashes by closing a Zstandard dictionary after it has been associated with a stream or context. The library's locking design released the dictionary's shared lock immediately after the load call, leaving the stream holding a native pointer to freed memory; subsequent read or write operations on that stream then access freed native heap, producing undefined behavior at the JVM/native boundary. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three simultaneous conditions: (1) the application must use zstd-jni's dictionary API - specifically ZstdDictDecompress or ZstdDictCompress loaded into a ZstdInputStreamNoFinalizer or ZstdOutputStreamNoFinalizer; (2) dictionary close must race with or occur after dictionary association but before stream operations complete, which in single-threaded applications requires an explicit programming error and in multi-threaded applications can arise from unsynchronized dictionary lifecycle management; (3) the application must run zstd-jni 1.3.8-4 through 1.5.7-13. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 7.0 with AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H accurately reflects a local-vector vulnerability with high integrity and availability impact but no confidentiality exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade zstd-jni to v1.5.7-14 or later, released at https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, scan all Java application dependencies and build artifacts to identify systems running zstd-jni versions 1.3.8-4 through 1.5.7-13, and flag those for prioritized remediation. …
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Use-after-free in zstd-jni's Dictionary Sharing component allows remote attackers to corrupt native heap memory through
Out-of-bounds read in zstd-jni versions 1.2.0 through 1.5.7-13 allows attackers who can supply dictionary constructor pa
Out-of-bounds read in zstd-jni versions 1.2.0 through 1.5.7-13 exposes JVM-based applications to service termination and
Out-of-bounds read in zstd-jni versions 1.5.5-6 through 1.5.7-13 exposes JVM-based applications to memory disclosure or
Out-of-bounds memory reads in zstd-jni versions 1.1.1 through 1.5.7-13 allow unauthenticated remote attackers to crash t
Out-of-bounds memory access in zstd-jni versions 1.3.3-1 through 1.5.7-13 enables unauthenticated network-accessible att
Use-after-free in zstd-jni versions 1.3.8-4 through 1.5.7-13 allows callers to invoke setDict, setLongMax, setLevel, and
Infinite-loop denial of service in zstd-jni versions 1.4.8-4 through 1.5.7-13 allows thread starvation by passing negati
Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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