CVE-2026-103119

Status: Awaiting AnalysisCritical (9.1)—

Severity9.1Critical · CVSS 3.1

Exploitation probability—next 30 days

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

News and reports on Orbitaley

Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.

This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.

Users are recommended to upgrade to version 11.0.27, which fixes the issue.

CVSS

Base score: 9.1
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploitation probability (EPSS)

FIRST hasn't scored this CVE yet (usual for very recent or rejected CVEs).

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access88 %
Primary impactT1005 Data from Local Systemcollection55 %
Secondary impactT1499 Endpoint Denial of Serviceimpact30 %

El vector AV:N/PR:N/UI:N indica explotación remota sin autenticación; el texto describe fuga de datos de una respuesta a otra y fallo de la segunda petición.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Apache — Tomcat^AI

CWEs

CWE-127

References

Show 2 references

Raw JSON (NVD)

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          "version": "2.0.3",
          "timestamp": "2026-10-20T15:41:16.526893Z"
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  "published": "2026-10-20T14:16:56.087",
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  "lastModified": "2026-10-20T19:35:38.940",
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