No exploitation reportedFix available

CVE-2023-49286

No exploitation reported by the sources we read.

Published2023-12-04
WeaknessCWE-253 · CWE-617 · CWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Incorrect Check of Function Return Value bug Squid is vulnerable to a Denial of Service attack against its Helper process management. This bug is fixed by Squid version 6.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Timeline

dates in UTC

2023-12-0423:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-49286?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-49286?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Squid-cache squid

Branch	Affected	Fixed in	Source
6.4	≤ 6.4	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libecapAlmaLinux:8all versions · fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8and 1 other package
libecapAlmaLinux:8all versions · fixed in 1.0.1-2.module_el8.6.0+3048+383bc947and 1 other package
squidAlmaLinux:9all versions · fixed in 7:5.5-6.el9_3.5
squidAlmaLinux:8all versions · fixed in 7:4.15-7.module_el8.9.0+3708+6acaac63.5

Full record on NVD

Fix

Advisories and patches

github.comPatch
github.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.18.6read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-253, CWE-617read 2026-10-23
NVDweakness (CWE)CWE-617, CWE-754read 2026-10-23
FIRST EPSSEPSS score10.4 %read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2023-12-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-49286?

Is CVE-2023-49286 actively exploited?

Active exploitation of CVE-2023-49286 has not been confirmed. Its EPSS score was 10.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-49286?

CVE-2023-49286 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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