CVE-2026-90852

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

0.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 45.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-15.

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

2026-09-15 02:15Z1 MO AGO

Last updated

2026-09-15 18:19Z1 MO AGO

Reserved

2026-09-14

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

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

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-416Use After FreeVariant
• CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

1af739928a963be3c76bca307eb1e63f04893aba8f2176275de4f5771488edb0

• vuldb.comVDB-403407 | luben zstd-jni Dictionary Sharing ZstdCompressCtx.java ZstdCompressCtx.loadDict use after freehttps://vuldb.com/vuln/403407vdb-entrytechnical-description
• vuldb.comVDB-403407 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/403407/ctisignaturepermissions-required
• vuldb.comCVE-2026-90852 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-90852third-party-advisory
• vuldb.comSubmit #927022 | luben zstd-jni 1.5.7-13 Cross-Object Use-After-Freehttps://vuldb.com/submit/927022third-party-advisory
• github.comhttps://github.com/luben/zstd-jni/issues/404exploitissue-tracking
• github.comhttps://github.com/luben/zstd-jni/commit/a560131d7834598afd9cea6b7c107bc88e915936patch
• github.comhttps://github.com/luben/zstd-jni/releases/tag/v1.5.7-14patch
• github.comhttps://github.com/luben/zstd-jni/product