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Furl EUVDEUVD-2026-115332

| CVE-2026-65059
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-11-02 CPANSec GHSA-m2rh-hmhf-hh5g
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Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V2 - Validation and Business Logic Compression ratio limits
Monitor Track and reassess. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).
No patch listed yet

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AnalysisCVE.org

Furl versions through 3.15 for Perl allow memory exhaustion via unbounded decompression of HTTP responses.

Furl inflates a response body sent with a gzip, x-gzip or deflate Content-Encoding and appends the output to the response string with no size limit. It does this whether or not the request asked for compression, and no option caps the decompressed size. Responses read with write_file or write_code are streamed rather than held in memory.

A malicious server, or an attacker on a plain HTTP connection, can send a small compressed response that expands to exhaust the client's memory and end the process.

Affects your stack

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  • Exploit and PoC references, threat intelligence from 22 sources

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Threat Intelligence Overview

Social Media
2
Sightings
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity Not scored yet
CISA KEV No
Public POC No
EPSS N/A
Patch available No
Active threat No
Deciding rule
No CVSS yet + weak signal (CWE or non-zero EPSS)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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