CVE-2026-103635

UNRATEDCVSS · not yet scoredTrending — 4 sources updated this week
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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: —CVSS v2: —Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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

compact_theta_sketch::deserialize() and wrapped_compact_theta_sketch::wrap() read header fields before checking that the input was long enough. For the compressed format, the size check could be defeated by a 32-bit overflow, and two header fields that control decoding were not validated; this also affected deserialization from a stream. A crafted or truncated sketch could cause a read past the end of the input. In the compressed case the over-read can be large, and the bytes read can become part of the deserialized sketch. This can cause a crash (denial of service) and could expose adjacent memory contents.

This issue affects Apache DataSketches C++: from 3.1.0 before 5.3.0. Only applications that deserialize Theta sketches from untrusted sources are affected.

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

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
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EPSS %ILE
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KEV
Not listed

Published

October 10, 2026

Last Modified

October 10, 2026

References (3)

Vendor Advisories for CVE-2026-103635(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 4× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-10 13:23 UTCGHSA enrichmentGHSA-hh2m-8j82-33gp
  2. 2026-10-10 11:20 UTCNVD update
  3. 2026-10-10 10:37 UTCEG score recompute
  4. 2026-10-10 10:35 UTCMITRE cvelistV5first tracked

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Frequently asked(3)

What is CVE-2026-103635?
CVE-2026-103635 is a publicly disclosed vulnerability published on October 10, 2026. Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). compactthetasketch::deserialize() and wrappedcompacttheta_sketch::wrap() read header fields before checking that the input was long enough. For the compressed format, the size check…
When was the CVE record for CVE-2026-103635 published?
The CVE record for CVE-2026-103635 was published on October 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 10, 2026; the record at its source may have been updated since.
How do I remediate CVE-2026-103635?
The CVE record for CVE-2026-103635 names the fix: "Users are recommended to upgrade to version 5.3.0, which fixes this issue." The vendor advisories EchelonGraph has for CVE-2026-103635 are linked in the Vendor Advisories panel on this page.

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