CVE-2018-16890

high
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
8.0

Description

libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-16890

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-16890.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201902-9

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201902-13

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201902-12

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201902-11

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201902-10

OS impact

OSVersionStatusFixed in
arch archfixed7.64.0-1
suse slesaffected
debian debianbookwormfixed7.64.0-1
debian debianbullseyefixed7.64.0-1
debian debianforkyfixed7.64.0-1
debian debiansidfixed7.64.0-1
debian debiantrixiefixed7.64.0-1

References

Verify integrity in audit chain (admin only). AS-IS.