CVE-2026-65059
Furl versions before 3.16 for Perl allow memory exhaustion via unbounded decompression of HTTP responses
Furl versions before 3.16 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.
Fixes and workarounds
Fix
Upgrade to version 3.16 or later.
Source: CNA: CPANSecAffected products and versions
| Product | Versions | Authority |
|---|---|---|
Furl
cpan |
≥ 0; < 3.16 (affected, custom)
Other versions: unaffected |
CNA: CPANSec |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | ADP: CISA-ADP |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://metacpan.org/release/SYOHEX/Furl-3.15/source/lib/Furl/ZlibStream.pmCNA: CPANSec · technical-description
- https://github.com/tokuhirom/Furl/pull/139CNA: CPANSec · issue-tracking
- https://metacpan.org/release/TOKUHIROM/Furl-3.16/changesCNA: CPANSec · release-notes
- http://www.openwall.com/lists/oss-security/2026/11/02/5ADP: CVE
- https://github.com/tokuhirom/Furl/pull/1399b29abf9-4ab0-4765-b253-1875cd9b441e
- https://metacpan.org/release/SYOHEX/Furl-3.15/source/lib/Furl/ZlibStream.pm9b29abf9-4ab0-4765-b253-1875cd9b441e
- http://www.openwall.com/lists/oss-security/2026/11/02/5af854a3a-2127-422b-91ae-364da2661108
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.