Vulnerability-Lookup

GHSA-2W73-5H25-V3CG

Vulnerability from github – Published: 2026-10-10 12:30 – Updated: 2026-10-10 15:30

Details

Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).

A crafted serialized CPC sketch passed to cpc_sketch::deserialize(), from either a byte buffer or a stream, can cause the decompressor to read past the end of the compressed data, because the read position was only checked after decoding finished. In the hybrid flavor, it can also cause a write outside an internal heap buffer, because decoded row indices were not validated. Several other header fields and decoded values, including lg_k, were also not validated. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.

This issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize CPC sketches from untrusted sources are affected.

Users are recommended to upgrade to version 5.3.0, which fixes this issue.

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103513"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-10T11:17:35Z",
    "severity": null
  },
  "details": "Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\n\nA crafted serialized CPC sketch passed to cpc_sketch::deserialize(), from either a byte buffer or a stream, can cause the decompressor to read past the end of the compressed data, because the read position was only checked after decoding finished. In the hybrid flavor, it can also cause a write outside an internal heap buffer, because decoded row indices were not validated. Several other header fields and decoded values, including lg_k, were also not validated. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.\n\nThis issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize CPC sketches from untrusted sources are affected.\n\nUsers are recommended to upgrade to version 5.3.0, which fixes this issue.",
  "id": "GHSA-2w73-5h25-v3cg",
  "modified": "2026-10-10T15:30:21Z",
  "published": "2026-10-10T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103513"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/s7wyoqyf120dl5ys8jtr26dskd6m485h"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/10/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-103513 (GCVE-0-2026-103513)

Vulnerability from cvelistv5 – Published: 2026-10-10 10:23 – Updated: 2026-10-10 12:10

Title

Apache DataSketches: datasketches-cpp: Out-of-bounds read and write in the CPC sketch deserialization allows memory corruption via a crafted sketch

Summary

Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). A crafted serialized CPC sketch passed to cpc_sketch::deserialize(), from either a byte buffer or a stream, can cause the decompressor to read past the end of the compressed data, because the read position was only checked after decoding finished. In the hybrid flavor, it can also cause a write outside an internal heap buffer, because decoded row indices were not validated. Several other header fields and decoded values, including lg_k, were also not validated. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize CPC sketches from untrusted sources are affected. Users are recommended to upgrade to version 5.3.0, which fixes this issue.

Severity

No CVSS data available.

CWE

CWE-787 - Out-of-bounds write
CWE-125 - Out-of-bounds read

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 939 records in the last 180 days details

References

3 references

URL	Tags
https://lists.apache.org/thread/s7wyoqyf120dl5ys8…	vendor-advisory
https://github.com/apache/datasketches-cpp/releas…	release-notes
http://www.openwall.com/lists/oss-security/2026/10/10/3

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache DataSketches	Affected: 2.0.0-incubating , ≤ 5.2.0 (semver)

Credits

He Huang NexusSan

Show details on NVD website

JSON

To clipboard

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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-2W73-5H25-V3CG

CVE-2026-103513 (GCVE-0-2026-103513)

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