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Fencer Intel
high 7.5

CVE-2018-10184 json

An issue was discovered in HAProxy before 1.8.8.

published 2018-05-09 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-2262

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.1%
EPSS 8.1% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

An issue was discovered in HAProxy before 1.8.8. The incoming H2 frame length was checked against the max_frame_size setting instead of being checked against the bufsize. The max_frame_size only applies to outgoing traffic and not to incoming, so if a large enough frame size is advertised in the SETTINGS frame, a wrapped frame will be defragmented into a temporary allocated buffer where the second fragment may overflow the heap by up to 16 kB. It is very unlikely that this can be exploited for code execution given that buffers are very short lived and their addresses not realistically predictable in production, but the likelihood of an immediate crash is absolutely certain.

Patch / fix

  • haproxy haproxy 1.8.8
  • haproxy Debian 14, Debian 13, Debian 12 1.8.8-1

debian advisories DEBIAN-CVE-2018-10184

  • rh-haproxy18-haproxy RHEL 3 SOFTWARE_COLLECTIONS 1.8.4-2.el7
  • rh-haproxy18-haproxy-syspaths RHEL 3 SOFTWARE_COLLECTIONS 1.8.4-2.el7
  • haproxy openshift 3.9 1.8.8-1.el7
  • haproxy18 openshift 3.9 1.8.8-1.el7

red hat advisories RHSA-2018:1372RHBA-2018:1566

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-10184 updated cvss 8.6

haproxy: Heap buffer overflow in mux_h2.c:h2_process_demux() can allow attackers to cause a denial of service

  • Red Hat OpenShift Container Platform 3.9 haproxy 1.8.8-1.el7, haproxy18 1.8.8-1.el7
    fixed: vendor fix RHBA-2018:1566
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-haproxy18-haproxy 1.8.4-2.el7, rh-haproxy18-haproxy-syspaths 1.8.4-2.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) rh-haproxy18-haproxy 1.8.4-2.el7, rh-haproxy18-haproxy-syspaths 1.8.4-2.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-haproxy18-haproxy 1.8.4-2.el7, rh-haproxy18-haproxy-syspaths 1.8.4-2.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-haproxy18-haproxy 1.8.4-2.el7, rh-haproxy18-haproxy-syspaths 1.8.4-2.el7 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-haproxy18-haproxy 1.8.4-2.el7, rh-haproxy18-haproxy-syspaths 1.8.4-2.el7
    fixed: vendor fix RHSA-2018:1372
  • Red Hat Enterprise Linux 6 haproxy Red Hat Enterprise Linux 7 haproxy Red Hat Enterprise Linux 8 haproxy Red Hat OpenShift Container Platform 3.9 apb 1.1.16-1.el7, cri-o 1.9.11-1.gitbc3d2f7.el7, cri-tools 1.0.0-3.git8e6013a.el7, prometheus 2.2.1-1.gitbc6058c.el7, apb-container-scripts 1.1.16-1.el7, ansible-service-broker 1.1.17-1.el7, +27 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.15% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.