CVE-2016-8622

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

The URL percent-encoding decode function in libcurl before 7.51.0 is called `curl_easy_unescape`. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.

Metrics

CVSS 3.0 9.8/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-122 CWE-190 CWE-787

Affected software

Vendor	Product	Versions
The Curl Project	curl	7.51.0

References

http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/94105Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037192Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2486Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3558
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622Issue Tracking, Patch, Third Party Advisory
https://curl.haxx.se/docs/adv_20161102H.htmlPatch, Vendor Advisory
https://security.gentoo.org/glsa/201701-47Third Party Advisory
https://www.tenable.com/security/tns-2016-21Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/94105Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037192Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2486Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3558
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622Issue Tracking, Patch, Third Party Advisory
https://curl.haxx.se/docs/adv_20161102H.htmlPatch, Vendor Advisory
https://security.gentoo.org/glsa/201701-47Third Party Advisory
https://www.tenable.com/security/tns-2016-21Third Party Advisory

Timeline

Published: Jul 31, 2018
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2016

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