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Vulnerability record · CVE-2018-1000168 · published 8 May 2018

CVE-2018-1000168: Nghttp2 improper input validation vulnerability

Nghttp2 · Nghttp2

nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC frame handling that can result in segmentation fault leading to denial of service. This attack appears to be exploitable via network client. This vulnerability appears to have been fixed in >= 1.31.1.

7.5 CVSS 3.1 High EPSS 11% · top 4.3% CWE-20 · Improper input validationCWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC frame handling that can result in segmentation fault leading to denial of service. This attack appears to be exploitable via network client. This vulnerability appears to have been fixed in >= 1.31.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/103952 Broken LinkThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0366 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0367 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html Mailing ListThird Party Advisory
https://nghttp2.org/blog/2018/04/12/nghttp2-v1-31-1/ Vendor Advisory
https://nodejs.org/en/blog/vulnerability/june-2018-security-releases/ Release NotesThird Party Advisory
http://www.securityfocus.com/bid/103952 Broken LinkThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0366 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0367 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html Mailing ListThird Party Advisory
https://nghttp2.org/blog/2018/04/12/nghttp2-v1-31-1/ Vendor Advisory
https://nodejs.org/en/blog/vulnerability/june-2018-security-releases/ Release NotesThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-1000168), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.