CVE-2026-87824

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 32.7% of scored records. A rank, not a probability.

NVD base score

8.7 (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:N/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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-20.

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

2026-09-20 00:35Z1 MO AGO

Reserved

2026-09-09

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.7)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

43cf8eb99cfdb6fd2f8667d99baadb0e83a6bd2bac69c36f9e76e7971d2bf725

• github.comGitHub Security Advisory (GHSA-257p-3h6w-pg7h)https://github.com/luben/zstd-jni/security/advisories/GHSA-257p-3h6w-pg7hvendor-advisory
• github.comFix commit: validate the samples buffer capacity against the declared sample sizeshttps://github.com/luben/zstd-jni/commit/bba6cfca2c0897f1fa004f4193247479f10da853patch
• github.comSamples buffer capacity never read at v1.5.7-13https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zdict.ctechnical-description
• github.comJava wrapper that only checks the sample count at v1.5.7-13https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.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 introduced the direct-buffer dictionary trainer without a samples capacity check (first released in 1.3.3-1)https://github.com/luben/zstd-jni/commit/53d3c6342883f7d6717b2477a7f9c1b4a4a56980technical-descriptionpatch
• github.comhttps://github.com/luben/zstd-jniproduct
• www.vulncheck.comVulnCheck Advisory: zstd-jni 1.3.3-1 through 1.5.7-13 Out-of-Bounds Read via Zstd.trainFromBufferDirecthttps://www.vulncheck.com/advisories/zstd-jni-1.3.3-1-through-1.5.7-13-out-of-bounds-read-via-zstd-trainfrombufferdirectthird-party-advisory