CVE-2026-87825

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.21% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 11.6% of scored records. A rank, not a probability.

NVD base score

7.0 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-14.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-09 14:32Z1 MO AGO

Last updated

2026-09-14 13:35Z1 MO AGO

Reserved

2026-09-09

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 7.0)

CNA CVSS vector

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

Weaknesses

• CWE-416Use After FreeVariant
• CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

8424ade032d890e14b9f5d3801c2e9dcf1adae6fc92e173bc0c401e7720be7fa

• github.comGitHub Security Advisory (GHSA-947w-pxjj-c7m9)https://github.com/luben/zstd-jni/security/advisories/GHSA-947w-pxjj-c7m9vendor-advisory
• github.comFix commit: hold the dictionary shared lock for the stream's usage windowhttps://github.com/luben/zstd-jni/commit/393d7311766abbc285b149302c0fe1f94b16d555patch
• github.comFix commit: cross-object lifetime tracking for dictionaries and contextshttps://github.com/luben/zstd-jni/commit/a560131d7834598afd9cea6b7c107bc88e915936patch
• github.comShared lock released as soon as the dictionary is loaded at v1.5.7-13https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/ZstdInputStreamNoFinalizer.javatechnical-description
• github.comSame lock lifecycle in the buffer stream base class at v1.5.7-13https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/BaseZstdBufferDecompressingStreamNoFinalizer.javatechnical-description
• github.comzstd-jni v1.5.7-14 Release Noteshttps://github.com/luben/zstd-jni/releases/tag/v1.5.7-14release-notes
• github.comCommit that made setDict load the dictionary eagerly into the native context (first released in 1.3.8-4)https://github.com/luben/zstd-jni/commit/0827ed02551bbd8d6f8e4bbff99d83bf50f91938technical-descriptionpatch
• github.comhttps://github.com/luben/zstd-jniproduct
• www.vulncheck.comVulnCheck Advisory: zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionarieshttps://www.vulncheck.com/advisories/zstd-jni-1.3.8-4-through-1.5.7-13-use-after-free-of-compression-and-decompression-dictionariesthird-party-advisory