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Vulnerability record · CVE-2018-0500 · published 11 July 2018

CVE-2018-0500: Haxx curl out-of-bounds write vulnerability

Haxx · Curl

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

9.8 CVSS 3.0 Critical EPSS 6.4% · top 6.6% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
6.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securitytracker.com/id/1041280 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2486 Third Party Advisory
https://curl.haxx.se/docs/adv_2018-70a2.html ExploitPatchVendor Advisory
https://github.com/curl/curl/commit/ba1dbd78e5f1ed67c1b8d37ac89d90e5e330b628 PatchThird Party Advisory
https://security.gentoo.org/glsa/201807-04 Third Party Advisory
https://usn.ubuntu.com/3710-1/ Third Party Advisory
http://www.securitytracker.com/id/1041280 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2486 Third Party Advisory
https://curl.haxx.se/docs/adv_2018-70a2.html ExploitPatchVendor Advisory
https://github.com/curl/curl/commit/ba1dbd78e5f1ed67c1b8d37ac89d90e5e330b628 PatchThird Party Advisory
https://security.gentoo.org/glsa/201807-04 Third Party Advisory
https://usn.ubuntu.com/3710-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-0500), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.