What’s Vulnerable › Vulnerabilities

CVE-2016-9586

• Severity: high (CVSS 8.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-04-23 · updated 2026-06-17
• Weakness: CWE-122

Description

curl before version 7.52.0 is vulnerable to a buffer overflow when doing a large floating point output in libcurl's implementation of the printf() functions. If there are any application that accepts a format string from the outside without necessary input filtering, it could allow remote attacks.

Affected products

• curl: before 7.52.0 — fixed in 7.52.0

How to fix

Upgrade to a fixed version: curl 7.52.0. Check the vendor advisory for mitigations.

References

• http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
• http://www.securityfocus.com/bid/95019
• http://www.securitytracker.com/id/1037515
• https://access.redhat.com/errata/RHSA-2018:3558
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9586
• https://curl.haxx.se/docs/adv_20161221A.html
• https://github.com/curl/curl/commit/curl-7_51_0-162-g3ab3c16
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2018/11/msg00005.html
• https://security.gentoo.org/glsa/201701-47
• http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

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