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Vulnerability record · CVE-2018-16839 · published 31 October 2018

CVE-2018-16839: Haxx curl heap-based buffer overflow vulnerability

Haxx · Curl

Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.

9.8 CVSS 3.0 Critical EPSS 5.8% · top 7.2% CWE-122 · Heap-based buffer overflowCWE-190 · Integer overflow
9.8CVSS 3.0 base score, v2 7.5
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.

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

Affected products

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

References

LinkTags
http://www.securitytracker.com/id/1042012 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16839 Issue TrackingThird Party Advisory
https://curl.haxx.se/docs/CVE-2018-16839.html PatchVendor Advisory
https://github.com/curl/curl/commit/f3a24d7916b9173c69a3e0ee790102993833d6c5 PatchThird Party Advisory
https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.
https://lists.debian.org/debian-lts-announce/2018/11/msg00005.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-03 Third Party Advisory
https://usn.ubuntu.com/3805-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4331 Third Party Advisory
http://www.securitytracker.com/id/1042012 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16839 Issue TrackingThird Party Advisory
https://curl.haxx.se/docs/CVE-2018-16839.html PatchVendor Advisory
https://github.com/curl/curl/commit/f3a24d7916b9173c69a3e0ee790102993833d6c5 PatchThird Party Advisory
https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.
https://lists.debian.org/debian-lts-announce/2018/11/msg00005.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/201903-03 Third Party Advisory
https://usn.ubuntu.com/3805-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4331 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-16839), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.