CVE-2018-16840

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
The Curl Project	curl	from 7.59.0 to 7.61.1

References

http://www.securitytracker.com/id/1042013Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Issue Tracking, Third Party Advisory
https://curl.haxx.se/docs/CVE-2018-16840.htmlPatch, Vendor Advisory
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fPatch, Third Party Advisory
https://security.gentoo.org/glsa/201903-03Third Party Advisory
https://usn.ubuntu.com/3805-1/Third Party Advisory
http://www.securitytracker.com/id/1042013Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840Issue Tracking, Third Party Advisory
https://curl.haxx.se/docs/CVE-2018-16840.htmlPatch, Vendor Advisory
https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3fPatch, Third Party Advisory
https://security.gentoo.org/glsa/201903-03Third Party Advisory
https://usn.ubuntu.com/3805-1/Third Party Advisory

Timeline

Published: Oct 31, 2018
Last modified: Jun 17, 2026
NVD status: Analyzed

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