CVE-2026-33526

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Source
https://cve.org/CVERecord?id=CVE-2026-33526
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33526.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33526
Aliases
  • GHSA-hpfx-h48q-gvwg
Downstream
Related
Published
2026-03-26T00:16:12.195Z
Modified
2026-07-09T17:42:10.427876Z
Severity
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H CVSS Calculator
Summary
Squid vulnerable to Denial of Service in ICP Request handling
Details

Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero icp_port). This problem cannot be mitigated by denying ICP queries using icp_access rules. Version 7.5 contains a patch.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-416",
        "CWE-826"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33526.json"
}
References

Affected packages

Git / github.com/squid-cache/squid

Affected ranges

Type
GIT
Repo
https://github.com/squid-cache/squid
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2e58fa81c730f29f6ec52ef8bd056e658e01d50c
Fixed
8a7d42f9d44befb8fcbbb619505587c8de6a1e91
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.5"
        }
    ],
    "cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

4.*
4.15-20210522-snapshot
4.15-20210523-snapshot
4.15-20210524-snapshot
4.15-20210525-snapshot
4.15-20210527-snapshot
5.*
5.0.6-20210522-snapshot
5.0.6-20210523-snapshot
5.0.6-20210524-snapshot
5.0.6-20210525-snapshot
5.0.6-20210527-snapshot
6.*
6.0.0-20210522-master-snapshot
6.0.0-20210523-master-snapshot
6.0.0-20210524-master-snapshot
6.0.0-20210525-master-snapshot
6.0.0-20210527-master-snapshot
Other
HISTORIC_RELEASES
M-staged-PR161
M-staged-PR164
M-staged-PR170
M-staged-PR176
M-staged-PR179
M-staged-PR181
M-staged-PR182
M-staged-PR186
M-staged-PR189
M-staged-PR193
M-staged-PR195
M-staged-PR196
M-staged-PR198
M-staged-PR199
M-staged-PR200
M-staged-PR202
M-staged-PR206
M-staged-PR208
M-staged-PR209
M-staged-PR210
M-staged-PR218
M-staged-PR220
M-staged-PR221
M-staged-PR225
M-staged-PR227
M-staged-PR229
M-staged-PR230
M-staged-PR235
M-staged-PR237
M-staged-PR238
M-staged-PR239
M-staged-PR241
M-staged-PR242
M-staged-PR252
M-staged-PR255
M-staged-PR258
M-staged-PR264
M-staged-PR266
M-staged-PR267
M-staged-PR268
M-staged-PR274
M-staged-PR276
M-staged-PR293
M-staged-PR294
M-staged-PR295
M-staged-PR299
M-staged-PR306
M-staged-PR314
M-staged-PR319
M-staged-PR342
M-staged-PR345
M-staged-PR348
M-staged-PR351
M-staged-PR359
M-staged-PR364
M-staged-PR365
M-staged-PR366
M-staged-PR370
M-staged-PR372
M-staged-PR373
M-staged-PR375
M-staged-PR376
SQUID_3_0_PRE1
SQUID_3_0_PRE2
SQUID_3_0_PRE3
SQUID_3_0_PRE4
SQUID_3_0_PRE5
SQUID_3_0_PRE6
SQUID_3_0_PRE7
SQUID_3_0_RC1
SQUID_3_5_27
SQUID_4_0_1
SQUID_4_0_10
SQUID_4_0_11
SQUID_4_0_12
SQUID_4_0_13
SQUID_4_0_14
SQUID_4_0_15
SQUID_4_0_16
SQUID_4_0_2
SQUID_4_0_3
SQUID_4_0_4
SQUID_4_0_5
SQUID_4_0_6
SQUID_4_0_7
SQUID_4_0_8
SQUID_4_0_9
SQUID_7_0_1
SQUID_7_0_2
SQUID_7_1
SQUID_7_2
SQUID_7_3
SQUID_7_4
take00

Database specific

vanir_signatures_modified 
"2026-07-09T17:42:10Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33526.json"
vanir_signatures 
[
    {
        "signature_type": "Line",
        "target": {
            "file": "src/icp_v2.cc"
        },
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "73291067842458533164972804911244939871",
                "289434267660738907646178562670084950542",
                "161410907837101138192443052047182141846",
                "288951295780996692180570840948384752569"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-33526-85b6743e",
        "source": "https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "target": {
            "file": "src/icp_v2.cc",
            "function": "icpGetRequest"
        },
        "deprecated": false,
        "digest": {
            "length": 489.0,
            "function_hash": "77918609118482961262740620302725334546"
        },
        "id": "CVE-2026-33526-d849cb7b",
        "source": "https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91",
        "signature_version": "v1"
    }
]