Which products and versions are affected by CVE-2023-50269?

Affected: Squid (Squid-Cache) versions 2.6, 2.7, 2.7-stable1, 2.7-stable2, 2.7-stable3, 2.7-stable4, 2.7-stable5, 2.7-stable6; rootio-squid; squid3 (ubuntu), among others. The full list is in the CVE brief.

Is CVE-2023-50269 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2023-50269 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2023-50269?

No public exploit code is known.

Is there a fix for CVE-2023-50269?

Fixed versions are available, including libecap 1.0.1-2.module_el8.6.0+2741+01592ae8, libecap 1.0.1-2.module+el8.9.0+1437+df5ea8f0, libecap 1.0.1-2.module+el8.9.0+90083+f7556140.

How urgently should CVE-2023-50269 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2023-50269

High

Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing.

Published Dec 14, 2023 · Updated Sep 29, 2026 · Also known as ALPINE-CVE-2023-50269, DEBIAN-CVE-2023-50269, GHSA-wgq4-4cfg-c4x3, ROOT-OS-ALPINE-318-CVE-2023-50269, SUSE-SU-2024:0296-1, SUSE-SU-2024:0298-1, SUSE-SU-2024:0455-1, UBUNTU-CVE-2023-50269

Key Facts

Patch immediately

CVE-2023-50269 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Squid (Squid-Cache), rootio-squid, squid3 (ubuntu) and 5 more products.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 58% probability of exploitation in the next 30 days.
Fixed versions are available, including libecap 1.0.1-2.module_el8.6.0+2741+01592ae8, libecap 1.0.1-2.module+el8.9.0+1437+df5ea8f0, libecap 1.0.1-2.module+el8.9.0+90083+f7556140.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

7.5

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

EPSS (30-day exploit likelihood)

58%

Higher than 99.0% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2023-50269 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.

Affected Products

111 affected entries in total

Product	Affected versions	Fixed in
SquidSquid-Cache	2.6, 2.7, 2.7-stable1, 2.7-stable2, 2.7-stable3, 2.7-stable4, 2.7-stable5, 2.7-stable6	5.9
rootio-squidrootio	See advisory	5.9-r00071
squid3ubuntu	See advisory	3.5.12-1ubuntu7.16+esm3
libecapalma	See advisory	1.0.1-2.module_el8.6.0+2741+01592ae8
squid-migration-scriptamazon	See advisory	7:3.5.20-17.54.amzn1

3 more affected products in the full CVE brief

Patched Releases

libecap

1.0.1-2.module_el8.6.0+2741+01592ae8, 1.0.1-2.module+el8.9.0+1437+df5ea8f0, 1.0.1-2.module+el8.9.0+90083+f7556140

libecap-devel

1.0.1-2.module+el8.9.0+90083+f7556140

rootio-squid

5.9-r00071, 5.9-r00072, 5.9-r00073, 5.9-r00074, 5.9-r00075, 6.6-r0

Squid

4.10-1ubuntu1.9, 4.13-10+deb11u3, 4.17-150000.5.49.1, 4.17-4.41.1, 4.6-1+deb10u9, 5.7-0ubuntu0.22.04.3, 5.7-150400.3.23.1, 5.7-2+deb12u1, 5.9-4.ph3, 5.9-r00071, 5.9-r00072, 5.9-r00073, 5.9-r00074, 5.9-r00075, 6.5-1ubuntu3, 6.6-1, 6.6-1.ph4, 6.6-1.ph5, 6.6-2.1, 6.6-r0, 7:3.5.20-17.0.1.el7_9.10, 7:3.5.20-17.54.amzn1, 7:3.5.20-17.amzn2.7.16, 7:3.5.20-17.el7_9.10, 7:4.15-7.module_el8.9.0+3749+dbf371ed.10, 7:4.15-7.module+el8.9.0+90184+ff65e696.10, 7:5.5-5.el9_2.4, 7:5.5-6.0.1.el9_3.8, 7:5.5-6.el9_3.8, 7:5.8-1.amzn2023.0.4, <=5.9

squid-migration-script

7:3.5.20-17.0.1.el7_9.10, 7:3.5.20-17.54.amzn1, 7:3.5.20-17.amzn2.7.16

squid-sysvinit

7:3.5.20-17.0.1.el7_9.10, 7:3.5.20-17.amzn2.7.16

squid:4

8090020240314114525.a75119d5

squid3

3.5.12-1ubuntu7.16+esm3, 3.5.27-1ubuntu1.14+esm2

Timeline

Publicly disclosed
Dec 14, 2023
Last updated
Sep 29, 2026

Weakness Type

CWE-674 Uncontrolled Recursion

References

15 more references in the full CVE brief

FAQ

Common Questions.

Squid is a caching proxy for the Web.
Affected: Squid (Squid-Cache) versions 2.6, 2.7, 2.7-stable1, 2.7-stable2, 2.7-stable3, 2.7-stable4, 2.7-stable5, 2.7-stable6; rootio-squid; squid3 (ubuntu), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including libecap 1.0.1-2.module_el8.6.0+2741+01592ae8, libecap 1.0.1-2.module+el8.9.0+1437+df5ea8f0, libecap 1.0.1-2.module+el8.9.0+90083+f7556140.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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