CVE-2026-87825 (GCVE-0-2026-87825)

Vulnerability from cvelistv5 – Published: 2026-09-09 14:32 – Updated: 2026-09-14 13:35
VLAI
Title
zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries
Summary
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.
Severity
7 (High)
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
7.7 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:34 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
luben zstd-jni Affected: 1.3.8-4 , < 1.5.7-14 (custom)
guessed Create a notification for this product.
Date Public
2026-08-19 00:00
Credits
Yu Bao, PayPal Cyber Security Team
Show details on NVD website
To clipboard 

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              "url": "https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/BaseZstdBufferDecompressingStreamNoFinalizer.java"
            },
            {
              "name": "zstd-jni v1.5.7-14 Release Notes",
              "tags": [
                "release-notes"
              ],
              "url": "https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14"
            },
            {
              "name": "Commit that made setDict load the dictionary eagerly into the native context (first released in 1.3.8-4)",
              "tags": [
                "technical-description",
                "patch"
              ],
              "url": "https://github.com/luben/zstd-jni/commit/0827ed02551bbd8d6f8e4bbff99d83bf50f91938"
            },
            {
              "tags": [
                "product"
              ],
              "url": "https://github.com/luben/zstd-jni"
            },
            {
              "name": "VulnCheck Advisory: zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/zstd-jni-1.3.8-4-through-1.5.7-13-use-after-free-of-compression-and-decompression-dictionaries"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries",
          "x_generator": {
            "engine": "vulncheck-endgame"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-87825",
        "datePublished": "2026-09-09T14:32:44.795Z",
        "dateReserved": "2026-09-09T10:32:34.110Z",
        "dateUpdated": "2026-09-14T13:35:21.082Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.