EUVD-2026-78255
GHSA-hhh7-cpvm-vxxc
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
Network vector applies when library is embedded in a network service; AC:H reflects the concurrent dictionary sharing usage pattern required to trigger the UAF; impact limited to partial heap disclosure and DoS.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability has been found in luben zstd-jni up to 1.5.7-13. This vulnerability affects the function ZstdCompressCtx.loadDict of the file ZstdCompressCtx.java of the component Dictionary Sharing. Such manipulation leads to use after free. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.5.7-14 is able to resolve this issue. The name of the patch is a560131d7834598afd9cea6b7c107bc88e915936. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
AnalysisAI
Use-after-free in zstd-jni's Dictionary Sharing component allows remote attackers to corrupt native heap memory through the ZstdCompressCtx.loadDict() and ZstdDecompressCtx.loadDict() APIs in versions up to 1.5.7-13. The defect is a logic inversion in shared-lock accounting: the code releases the reference count on the incoming dictionary parameter rather than on the previously held dictionary reference, causing the old native buffer to remain referenced after it can be freed by another thread. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following: (1) the application must explicitly use the dictionary sharing API by constructing ZstdDictCompress or ZstdDictDecompress objects and passing them to loadDict() - applications using only raw byte[] dictionaries or no dictionaries are not affected; (2) the compression or decompression context must be reused across multiple loadDict() or reset() calls, creating the opportunity for the reference count to be corrupted; (3) for the UAF to manifest as a crash rather than a silent reference count leak, concurrent access patterns - a thread closing the old shared dictionary while another thread holds a now-zeroed reference - are required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector assigns AC:L and PR:N, implying straightforward unauthenticated remote exploitability, which overstates ease of triggering the race; actual UAF manifestation requires either concurrent dictionary close operations across threads or a specific load-then-reload API sequence that drives the native reference count to zero prematurely, making AC:H more defensible. … 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 version 1.5.7-14 or later, which corrects shared-lock accounting in all three affected code paths across ZstdCompressCtx, ZstdDecompressCtx, and AutoCloseBase. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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