CVE-2016-8622

LOW
3.7
CVSS Score
Published: July 31, 2018 at 09:00 PM UTC
Updated: June 17, 2026 at 12:54 AM UTC
2 products affected across 1 vendorLibcurlCurl

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Severity
LOW3.7
Exploit prediction
EPSS 5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 7.51.0
Affected range stops below 7.51.0, so it looks safe — our inference, not a vendor statement

References (9)

VDB Entryx_refsource_BIDThird Party Advisory
http://www.securityfocus.com/bid/94105
VDB Entryx_refsource_SECTRACKThird Party Advisory
http://www.securitytracker.com/id/1037192
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2018:2486
x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8622
x_refsource_CONFIRMPatchVendor Advisory
https://curl.haxx.se/docs/adv_20161102H.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/201701-47

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

3.7LOWredhat
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-190CWE-787

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