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Vulnerability record · CVE-2023-45539 · published 28 November 2023

CVE-2023-45539: Haproxy vulnerability

Haproxy · Haproxy

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.

8.2 CVSS 3.1 High EPSS 1.5% · top 26.3% CWE-116 · CWE-116
8.2CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=2eab6d354322932cfec2ed54de261e4347eca9a6 Broken Link
https://lists.debian.org/debian-lts-announce/2023/12/msg00010.html
https://lists.w3.org/Archives/Public/ietf-http-wg/2023JulSep/0070.html Mailing List
https://www.mail-archive.com/haproxy%40formilux.org/msg43861.html Release Notes
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=2eab6d354322932cfec2ed54de261e4347eca9a6 Broken Link
https://lists.debian.org/debian-lts-announce/2023/12/msg00010.html
https://lists.w3.org/Archives/Public/ietf-http-wg/2023JulSep/0070.html Mailing List
https://www.mail-archive.com/haproxy%40formilux.org/msg43861.html Release Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-19330Haproxy injection vulnerabilityThe HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa),…EPSS 4.0%9.1CVE-2023-25725Haproxy http request smuggling vulnerabilityHAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." …EPSS 5.4%9.0CVE-2026-55203Haproxy integer overflow vulnerabilityHAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer …EPSS 0.58%8.8CVE-2020-11100HAProxy HPACK decoder heap out-of-bounds writeThe HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4 contains an out-of-bounds write in hpack_dht_insert in hpack-tbl.c. A crafted HTTP/2 reques…EPSS 61%analysed8.7CVE-2026-55204Haproxy null pointer dereference vulnerabilityHAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that f…EPSS 0.48%7.5CVE-2025-11230Haproxy aloha appliance vulnerabilityInefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.EPSS 0.69%7.5CVE-2024-45506Haproxy vulnerabilityHAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service for HTTP/2 zero-copy forwarding (h2_sen…EPSS 1.2%7.5CVE-2023-0836Haproxy information exposure vulnerabilityAn information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 …EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2023-45539), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.