HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote…
Priority MEDIUM 45CWE-116Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Partial Red Hat: 13 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive information or have unspecified other impact upon misinterpretation of a path_end rule, such as routing index.html#.png to a static server.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01514 74th percentileScored 2026-11-07
Fix Partial Red Hat: 9 advisoriesRed Hat: 13 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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
Remediation
Red Hat 9 advisories
- RHSA-2024:10271 Released 2024-11-26 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) haproxy-1.8.27-2.el8_4.1
- Red Hat Enterprise Linux AppStream E4S (v.8.4) haproxy-1.8.27-2.el8_4.1
- Red Hat Enterprise Linux AppStream TUS (v.8.4) haproxy-1.8.27-2.el8_4.1
- RHSA-2024:10267 Released 2024-11-26 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) haproxy-1.8.27-5.el8_8.1
- RHSA-2024:9945 Released 2024-11-19 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) haproxy-1.8.23-3.el8_2.1
Show 6 more Red Hat advisories
- RHSA-2024:8849 Released 2024-11-05 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream (v. 8) haproxy-1.8.27-5.el8_10.1
- RHSA-2024:8874 Released 2024-11-05 · Red Hat rating Moderatehaproxy security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) haproxy-1.8.27-4.el8_6.1
- Red Hat Enterprise Linux AppStream E4S (v.8.6) haproxy-1.8.27-4.el8_6.1
- Red Hat Enterprise Linux AppStream TUS (v.8.6) haproxy-1.8.27-4.el8_6.1
- RHSA-2024:6412 Released 2024-09-11 · Red Hat rating ModerateOpenShift Container Platform 4.14.36 security update
- Red Hat OpenShift Container Platform 4.14 haproxy-2.6.13-4.rhaos4.14.el8, haproxy26-2.6.13-4.rhaos4.14.el8, openshift-4.14.0-202409041843.p0.g03a907c.assembly.stream.el8 +3
- RHSA-2024:4853 Released 2024-07-31 · Red Hat rating ModerateOpenShift Container Platform 4.15.24 packages and security update
- Red Hat OpenShift Container Platform 4.15 haproxy-2.6.13-4.rhaos4.15.el8, haproxy26-2.6.13-4.rhaos4.15.el8, podman-3:4.4.1-26.2.rhaos4.15.el8 +12
- 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
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 AppStream (v. 8) | Fixed | RHSA-2024:8849 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:1142 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2024:9945 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2024:10271 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2024:8874 |
| Red Hat Enterprise Linux AppStream E4S (v.8.4) | Fixed | RHSA-2024:10271 |
| Red Hat Enterprise Linux AppStream E4S (v.8.6) | Fixed | RHSA-2024:8874 |
| Red Hat Enterprise Linux AppStream EUS (v.8.8) | Fixed | RHSA-2024:10267 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:1089 |
| Red Hat Enterprise Linux AppStream TUS (v.8.4) | Fixed | RHSA-2024:10271 |
| Red Hat Enterprise Linux AppStream TUS (v.8.6) | Fixed | RHSA-2024:8874 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2024:6412 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2024:4853 |
Not affected: 2 products
- Red Hat OpenShift Container Platform 4.14
- Red Hat OpenShift Container Platform 4.15
Timeline
- 2026-10-02 Threatist record created from CVE-2023-45539
- 2026-10-03 Alias added: GHSA-79q7-m98p-qvhp
References
Other 4
- https://lists.w3.org/Archives/Public/ietf-http-wg/2023JulSep/0070.html
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=2eab6d354322932cfec2ed54de261e4347eca9a6
- https://www.mail-archive.com/haproxy%40formilux.org/msg43861.html
- [debian-lts-announce] 20231214 [SECURITY] [DLA 3688-1] haproxy security update
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-2023-21094 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… CVSS 3.1HIGH 7.2
- 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
Sources
- CVE-2023-45539 · CVE Program
- CVE-2023-45539 · NVD
- FIRST EPSS
- GHSA-79q7-m98p-qvhp · GitHub Advisory Database · CC BY 4.0
- CVE-2023-45539 · Red Hat security data · CC BY 4.0
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