CVE-2026-31248: n/a
Docling's METS GBS backend through version 2. 61. 0 is vulnerable to XML Entity Expansion (XXE) attacks. The vulnerability arises because the backend parses XML files extracted from . tar. gz archives using etree. fromstring() without disabling entity resolution. An attacker can craft a malicious XML file with nested entity definitions (an XML Bomb) that causes exponential entity expansion during parsing. This leads to excessive resource consumption and results in a denial of service (DoS) condition on the system running the Docling parser. There is no information about an available patch or official remediation at this time.
AI Analysis
Technical Summary
Docling's METS GBS backend up to version 2.61.0 improperly handles XML parsing by using etree.fromstring() without disabling entity resolution. This allows an attacker to embed a malicious XML file with nested entity definitions inside a .tar.gz archive. When processed, the XML parser performs exponential expansion of these entities, causing excessive CPU and memory usage, leading to a denial of service condition. The vulnerability is classified as an XML Entity Expansion (XXE) attack resulting in resource exhaustion. No CVSS score or official remediation details are currently available.
Potential Impact
Successful exploitation results in a denial of service condition due to excessive resource consumption during XML parsing. This can disrupt the availability of the Docling METS GBS backend service. There is no indication of data disclosure or code execution from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling XML entity resolution during parsing or implement input validation to block malicious XML files. Avoid processing untrusted XML content without proper safeguards.
CVE-2026-31248: n/a
Description
Docling's METS GBS backend through version 2. 61. 0 is vulnerable to XML Entity Expansion (XXE) attacks. The vulnerability arises because the backend parses XML files extracted from . tar. gz archives using etree. fromstring() without disabling entity resolution. An attacker can craft a malicious XML file with nested entity definitions (an XML Bomb) that causes exponential entity expansion during parsing. This leads to excessive resource consumption and results in a denial of service (DoS) condition on the system running the Docling parser. There is no information about an available patch or official remediation at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Docling's METS GBS backend up to version 2.61.0 improperly handles XML parsing by using etree.fromstring() without disabling entity resolution. This allows an attacker to embed a malicious XML file with nested entity definitions inside a .tar.gz archive. When processed, the XML parser performs exponential expansion of these entities, causing excessive CPU and memory usage, leading to a denial of service condition. The vulnerability is classified as an XML Entity Expansion (XXE) attack resulting in resource exhaustion. No CVSS score or official remediation details are currently available.
Potential Impact
Successful exploitation results in a denial of service condition due to excessive resource consumption during XML parsing. This can disrupt the availability of the Docling METS GBS backend service. There is no indication of data disclosure or code execution from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling XML entity resolution during parsing or implement input validation to block malicious XML files. Avoid processing untrusted XML content without proper safeguards.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-03-09T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028781cbff5d86108b8f60
Added to database: 5/12/2026, 1:50:57 AM
Last enriched: 5/12/2026, 2:10:53 AM
Last updated: 5/12/2026, 3:14:39 AM
Views: 2
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