HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23…
Priority HIGH 71CWE-444Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 6 fixed, 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length headers, violating RFC 9110 section 8.6. In uncommon cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02147 82nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 6 advisoriesRed Hat: 6 fixed, 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* | up to 2.0.32; 2.2.0 – 2.2.30; 2.4.0 – 2.4.23; 2.5.0 to before 2.6.15; 2.7.0 to before 2.7.10; 2.8.0 to before 2.8.2 | Vulnerable | HAProxy |
- cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* Versions up to 2.0.32; 2.2.0 – 2.2.30; 2.4.0 – 2.4.23; 2.5.0 to before 2.6.15; 2.7.0 to before 2.7.10; 2.8.0 to before 2.8.2 Vulnerable ·HAProxy
Remediation
Red Hat 6 advisories
- RHSA-2024:1142 Released 2024-03-05 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream (v. 9) haproxy-2.4.22-3.el9_3
- RHSA-2024:1089 Released 2024-03-05 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) haproxy-2.4.17-6.el9_2.2
- RHSA-2024:0308 Released 2024-01-25 · Red Hat rating ModerateOpenShift Container Platform 4.11.57 packages and security update
- Red Hat OpenShift Container Platform 4.11 haproxy-2.2.24-4.rhaos4.11.el8, haproxy22-2.2.24-4.rhaos4.11.el8
Show 3 more Red Hat advisories
- RHSA-2024:0200 Released 2024-01-17 · Red Hat rating ModerateOpenShift Container Platform 4.12.47 security update
- Red Hat OpenShift Container Platform 4.12 haproxy-2.2.24-4.rhaos4.12.el8, haproxy22-2.2.24-4.rhaos4.12.el8
- RHSA-2023:7606 Released 2023-12-06 · Red Hat rating ModerateOpenShift Container Platform 4.13.25 packages and security update
- Red Hat OpenShift Container Platform 4.13 haproxy-2.2.24-4.rhaos4.13.el8, haproxy22-2.2.24-4.rhaos4.13.el8
- RHSA-2023:7473 Released 2023-11-29 · Red Hat rating ImportantOpenShift Container Platform 4.14.4 packages and security update
- Ironic content for Red Hat OpenShift Container Platform 4.14 python-werkzeug-2.2.3-2.el9, python3-werkzeug-2.2.3-2.el9
- Red Hat OpenShift Container Platform 4.14 haproxy-2.6.13-2.rhaos4.14.el8, haproxy26-2.6.13-2.rhaos4.14.el8
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Out of support scope |
| Red Hat Software Collections | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:1142 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:1089 |
| Red Hat OpenShift Container Platform 4.11 | Fixed | RHSA-2024:0308 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2024:0200 |
| Red Hat OpenShift Container Platform 4.13 | Fixed | RHSA-2023:7606 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2023:7473 |
Not affected: 7 products
- Cryostat 2
- Ironic content for Red Hat OpenShift Container Platform 4.14
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4.11
- Red Hat OpenShift Container Platform 4.12
- Red Hat OpenShift Container Platform 4.13
- Red Hat OpenShift Container Platform 4.14
Timeline
- 2026-10-02 Threatist record created from CVE-2023-40225
- 2026-10-03 Alias added: GHSA-xgq7-jp95-v2qv
References
More Haproxy vulnerabilities
- TI-2020-08973 In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before… CVSS 3.1HIGH 8.8
- TI-2019-10602 HAProxy through 2.0.2 allows attackers to cause a denial of service (ha_panic) via… CVSS 3.0HIGH 7.5
- TI-2021-17418 An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be… CVSS 3.1HIGH 7.5
- TI-2016-04651 HAproxy 1.6.x before 1.6.6, when a deny comes from a reqdeny rule, allows remote… CVSS 3.0HIGH 7.5
- TI-2026-25946 An issue was discovered in HAProxy before 3.3.6. CVSS 3.1MEDIUM 5.8
- TI-2023-10998 HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are… CVSS 3.1CRITICAL 9.1
Sources
- CVE-2023-40225 · CVE Program
- CVE-2023-40225 · NVD
- FIRST EPSS
- GHSA-xgq7-jp95-v2qv · GitHub Advisory Database · CC BY 4.0
- CVE-2023-40225 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences