CVE-2018-20103

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-12 · updated 2026-06-17
Weakness: CWE-835

Description

An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

Affected products

Canonical Ubuntu Linux: 16.04, 18.04, 18.10
HAProxy: through 1.8.14
Red Hat OpenShift Container Platform 4.18: 3.11

References

http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=58df5aea0a0c926b2238f65908f5e9f83d1cca25
http://www.securityfocus.com/bid/106280
https://access.redhat.com/errata/RHBA-2019:0326
https://access.redhat.com/errata/RHBA-2019:0327
https://access.redhat.com/errata/RHSA-2019:1436
https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html
https://usn.ubuntu.com/3858-1/
http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=58df5aea0a0c926b2238f65908f5e9f83d1cca25
http://www.securityfocus.com/bid/106280
https://access.redhat.com/errata/RHBA-2019:0326
https://access.redhat.com/errata/RHBA-2019:0327
https://access.redhat.com/errata/RHSA-2019:1436

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