haproxy: Heap buffer overflow in mux_h2.c:h2_process_demux() can allow attackers to cause a denial of service
Published May 9, 2018
8.6
HIGHCVSS 3.0
EPSS 8.30%
Description
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.
Affected products
No data.
Configuration 2
- 7.0
- 7.3
- 7.4
- 7.5
No data.
Red Hat OpenShift Container Platform 3.9
haproxy-0:1.8.8-1.el7
Fixed · RHBA-2018:1566
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-haproxy18-haproxy-0:1.8.4-2.el7
Fixed · RHSA-2018:1372
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
rh-haproxy18-haproxy-0:1.8.4-2.el7
Fixed · RHSA-2018:1372
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
rh-haproxy18-haproxy-0:1.8.4-2.el7
Fixed · RHSA-2018:1372
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
rh-haproxy18-haproxy-0:1.8.4-2.el7
Fixed · RHSA-2018:1372
Red Hat Enterprise Linux 6
haproxy
Not affected
Red Hat Enterprise Linux 7
haproxy
Not affected
Red Hat Enterprise Linux 8
haproxy
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat OpenShift Container Platform 3.9 | haproxy-0:1.8.8-1.el7 | Fixed | RHBA-2018:1566 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-haproxy18-haproxy-0:1.8.4-2.el7 | Fixed | RHSA-2018:1372 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | rh-haproxy18-haproxy-0:1.8.4-2.el7 | Fixed | RHSA-2018:1372 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | rh-haproxy18-haproxy-0:1.8.4-2.el7 | Fixed | RHSA-2018:1372 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | rh-haproxy18-haproxy-0:1.8.4-2.el7 | Fixed | RHSA-2018:1372 |
| Red Hat Enterprise Linux 6 | haproxy | Not affected | n/a |
| Red Hat Enterprise Linux 7 | haproxy | Not affected | n/a |
| Red Hat Enterprise Linux 8 | haproxy | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (35 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.30% (0.08302) | 94.76th | v5 (v2026.06.15) |
| Sep 22, 2026 | 8.30% (0.08302) | 94.68th | v5 (v2026.06.15) |
| Sep 21, 2026 | 4.44% (0.04438) | 90.98th | v5 (v2026.06.15) |
| Sep 20, 2026 | 8.30% (0.08302) | 94.67th | v5 (v2026.06.15) |
| Sep 6, 2026 | 8.43% (0.08430) | 94.63th | v5 (v2026.06.15) |
| Sep 5, 2026 | 4.51% (0.04507) | 90.90th | v5 (v2026.06.15) |
| Aug 30, 2026 | 8.43% (0.08430) | 94.60th | v5 (v2026.06.15) |
| Aug 28, 2026 | 4.51% (0.04507) | 90.84th | v5 (v2026.06.15) |
| Aug 24, 2026 | 8.43% (0.08430) | 94.57th | v5 (v2026.06.15) |
| Aug 23, 2026 | 4.51% (0.04507) | 90.81th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.43% (0.08430) | 94.28th | v5 (v2026.06.15) |
| Nov 21, 2025 | 25.06% (0.25058) | 95.95th | v4 (v2025.03.14) |
| Nov 18, 2025 | 30.83% (0.30834) | 96.48th | v4 (v2025.03.14) |
| Jun 6, 2025 | 25.06% (0.25058) | 95.87th | v4 (v2025.03.14) |
| Mar 30, 2025 | 31.59% (0.31594) | 96.40th | v4 (v2025.03.14) |
| Mar 29, 2025 | 48.42% (0.48419) | 96.70th | v4 (v2025.03.14) |
| Mar 17, 2025 | 31.59% (0.31594) | 96.39th | v4 (v2025.03.14) |
| Dec 12, 2024 | 5.80% (0.05800) | 93.66th | v3 (v2023.03.01) |
| Apr 18, 2024 | 5.80% (0.05800) | 93.28th | v3 (v2023.03.01) |
| Mar 18, 2024 | 5.86% (0.05864) | 93.25th | v3 (v2023.03.01) |
| Nov 9, 2023 | 5.88% (0.05879) | 92.61th | v3 (v2023.03.01) |
| Nov 8, 2023 | 6.42% (0.06420) | 92.92th | v3 (v2023.03.01) |
| Jul 8, 2023 | 11.49% (0.11490) | 94.46th | v3 (v2023.03.01) |
| May 8, 2023 | 11.52% (0.11524) | 94.36th | v3 (v2023.03.01) |
| May 3, 2023 | 11.49% (0.11490) | 94.37th | v3 (v2023.03.01) |
| Mar 31, 2023 | 10.21% (0.10205) | 93.99th | v3 (v2023.03.01) |
| Mar 7, 2023 | 12.45% (0.12446) | 94.49th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.58% (0.02578) | 82.08th | v2 (v2022.01.01) |
| Feb 3, 2023 | 2.58% (0.02578) | 81.50th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.51% (0.02509) | 80.08th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.51% (0.02509) | 58.60th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.46% (0.01458) | 32.87th | v1 |
| Jan 6, 2022 | 1.46% (0.01458) | 32.17th | v1 |
| Sep 1, 2021 | 1.46% (0.01458) | 72.29th | v1 |
| Apr 14, 2021 | 1.46% (0.01458) | 0.00th | v1 |
References (7)
- http://git.haproxy.org/?p=haproxy-1.8.git%3Ba=commit%3Bh=cd117685f0cff4f2f5577ef6a21eaae96ebd9f28 x_refsource_CONFIRM
- http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=3f0e1ec70173593f4c2b3681b26c04a4ed5fc588 x_refsource_CONFIRM
- https://access.redhat.com/errata/RHSA-2018:1372 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-10184 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1569297 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-10184
- https://www.cve.org/CVERecord?id=CVE-2018-10184
| Link | Providers | Tags |
|---|---|---|
| http://git.haproxy.org/?p=haproxy-1.8.git%3Ba=commit%3Bh=cd117685f0cff4f2f5577ef6a21eaae96ebd9f28 | x_refsource_CONFIRM | |
| http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=3f0e1ec70173593f4c2b3681b26c04a4ed5fc588 | x_refsource_CONFIRM | |
| https://access.redhat.com/errata/RHSA-2018:1372 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2018-10184 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1569297 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-10184 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-10184 |
Change history (0)
No recorded changes yet.