High severity7.5NVD Advisory· Published Nov 26, 2019· Updated Jun 17, 2026
CVE-2019-18676
CVE-2019-18676
Description
An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
37- Squid/Squiddescription
- osv-coords25 versionspkg:rpm/almalinux/libecappkg:rpm/almalinux/libecap-develpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP1pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/squid&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/opensuse/squid&distro=openSUSE%20Leap%2015.0pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/squid&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/squid&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/opensuse/squid&distro=openSUSE%20Leap%2015.1pkg:rpm/suse/squid3&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/squid&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS
< 1.0.1-2.module_el8.6.0+2741+01592ae8+ 24 more
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 4.9-5.11.1
- (no CPE)range: < 4.9-4.3.2
- (no CPE)range: < 4.9-5.11.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 4.9-lp150.13.1
- (no CPE)range: < 4.9-4.3.2
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.5.21-26.20.1
- (no CPE)range: < 3.1.23-8.16.37.12.1
- (no CPE)range: < 4.9-lp151.2.7.1
- (no CPE)range: < 3.1.23-8.16.37.12.1
- (no CPE)range: < 2.7.STABLE5-2.12.30.6.1
- (no CPE)range: < 2.7.STABLE5-2.12.30.6.1
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*+ 4 more
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
10- www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patchnvdPatch
- github.com/squid-cache/squid/pull/275nvdPatchThird Party Advisory
- www.squid-cache.org/Advisories/SQUID-2019_8.txtnvdThird Party Advisory
- bugzilla.suse.com/show_bug.cginvdIssue TrackingThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlnvdMailing ListThird Party Advisory
- usn.ubuntu.com/4213-1/nvdThird Party Advisory
- usn.ubuntu.com/4446-1/nvdThird Party Advisory
- www.debian.org/security/2020/dsa-4682nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/nvd
News mentions
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