{"id":"CVE-2026-61642","aliases":["ALSA-2026:96078","AZL-108531","CLSA-2026-1792505835","CLSA-2026-1792517219","CLSA-2026-1792806435","DEBIAN-CVE-2026-61642","EUVD-2026-98919","GHSA-537g-4gfh-w7m6","OESA-2026-4580","OESA-2026-4581","OESA-2026-4582","OESA-2026-4583","RLSA-2026:96078","UBUNTU-CVE-2026-61642","USN-8941-1","USN-8998-1"],"status":"published","title":"Squid Request Smuggling in HTTP Transfer-Encoding","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02037,"percentile":0.81265,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-10-13T16:29:37Z","modified":"2026-11-09T15:12:19Z","fixes":[{"ecosystem":"AlmaLinux:8","package":"libecap","fixed_in":["1.0.1-2.module_el8.6.0+2741+01592ae8","1.0.1-2.module_el8.6.0+3048+383bc947"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"libecap-devel","fixed_in":["1.0.1-2.module_el8.6.0+2741+01592ae8","1.0.1-2.module_el8.6.0+3048+383bc947"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"squid","fixed_in":["7:4.15-10.module_el8.10.0+4354+d3ed158a.13"],"sources":["osv"]},{"ecosystem":"Azure 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Request Smuggling in HTTP Transfer-Encoding","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T16:29:37.325Z","modified":"2026-10-13T17:54:31.02Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:19:53.4444Z"}],"euvd":[{"id":"EUVD-2026-98919","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T16:29:37Z","modified":"2026-10-13T17:54:31Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T17:27:19.128463Z"}],"nvd":[{"id":"CVE-2026-61642","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T17:17:42.67Z","modified":"2026-10-16T16:00:33.533Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:57.132005Z"}],"osv":[{"id":"CVE-2026-61642","title":"Squid Request Smuggling in HTTP Transfer-Encoding","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T16:29:37.325Z","modified":"2026-11-09T15:12:19.75431842Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-09T15:32:21.787252Z"},{"id":"DEBIAN-CVE-2026-61642","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T17:17:42.67Z","modified":"2026-11-03T18:02:14.181439095Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T18:31:18.863855Z"},{"id":"OESA-2026-4580","title":"squid security update","description":"Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.\r\n\r\nSecurity Fix(es):\n\nSquid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients\u0026apos; future requests. This issue is fixed in version 7.6.(CVE-2026-61642)","status":"published","published":"2026-10-29T09:03:10Z","modified":"2026-10-29T09:15:25.69224168Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4581","title":"squid security update","description":"Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.\r\n\r\nSecurity Fix(es):\n\nSquid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients\u0026apos; future requests. This issue is fixed in version 7.6.(CVE-2026-61642)","status":"published","published":"2026-10-29T09:03:11Z","modified":"2026-10-29T09:15:35.046682494Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4582","title":"squid security update","description":"Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.\r\n\r\nSecurity Fix(es):\n\nSquid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients\u0026apos; future requests. This issue is fixed in version 7.6.(CVE-2026-61642)","status":"published","published":"2026-10-29T09:03:12Z","modified":"2026-10-29T09:15:35.050193715Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4583","title":"squid security update","description":"Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.\r\n\r\nSecurity Fix(es):\n\nSquid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients\u0026apos; future requests. This issue is fixed in version 7.6.(CVE-2026-61642)","status":"published","published":"2026-10-29T09:03:13Z","modified":"2026-10-29T09:15:35.99671892Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"RLSA-2026:96078","title":"Important: squid:4 security update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, and HTTP data objects.\n\nSecurity Fix(es):\n\n* squid: squid: Request Smuggling in HTTP Transfer-Encoding (CVE-2026-61642)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-11-09T12:01:23.883619Z","modified":"2026-11-09T12:30:02.317915796Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-09T12:55:11.24816Z"},{"id":"UBUNTU-CVE-2026-61642","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T17:17:00Z","modified":"2026-11-05T11:57:11.563441799Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-05T13:30:00.949926Z"},{"id":"ALSA-2026:96078","title":"Important: squid:4 security update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, and HTTP data objects.  \n\nSecurity Fix(es):  \n\n  * squid: squid: Request Smuggling in HTTP Transfer-Encoding (CVE-2026-61642)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-11-09T00:00:00Z","modified":"2026-11-09T15:00:02.558214679Z","updated_at":"2026-11-09T15:32:21.787252Z"},{"id":"AZL-108531","title":"CVE-2026-61642 affecting package squid for versions less than 6.13-6","description":"Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.","status":"published","published":"2026-10-13T17:17:42Z","modified":"2026-11-06T14:16:28.564514945Z","updated_at":"2026-11-06T14:57:15.495576Z"},{"id":"CLSA-2026-1792505835","title":"Fix CVE(s): CVE-2026-61642","description":"   * SECURITY UPDATE: HTTP request smuggling via Transfer-Encoding: identity\n     - debian/patches/CVE-2026-61642.patch: reject bare identity coding\n     - CVE-2026-61642","status":"published","published":"2026-10-20T14:17:25Z","modified":"2026-10-26T09:32:06.363207347Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792517219","title":"squid: Fix of 2 CVEs","description":"- CVE-2026-61642: reject bare Transfer-Encoding: identity to prevent HTTP\n  request smuggling","status":"published","published":"2026-10-21T07:58:39Z","modified":"2026-10-26T09:30:59.763168414Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CLSA-2026-1792806435","title":"Fix CVE(s): CVE-2026-61642","description":"   * SECURITY UPDATE: request smuggling via Transfer-Encoding: identity\n     - debian/patches/CVE-2026-61642.patch: reject Transfer-Encoding: identity\n     - CVE-2026-61642","status":"published","published":"2026-10-24T01:47:26Z","modified":"2026-10-26T09:31:53.519838939Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"USN-8941-1","title":"squid, squid3 vulnerabilities","description":"It was discovered that Squid incorrectly handled certain HTTP Transfer-\nEncoding headers. An attacker could possibly use this issue to perform HTTP\nrequest smuggling attacks, bypass security mechanisms, or poison web\ncaches.  (CVE-2026-61642)\n\nIt was discovered that Squid incorrectly handled certain cache digest\nreplies, which could lead to a buffer overflow. A remote attacker could\npossibly use this issue to cause Squid to crash, resulting in a denial of\nservice. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and\nUbuntu 20.04 LTS. (CVE-2026-50012)\n\nIt was discovered that Squid incorrectly handled parsing certain FTP\ndirectory listings. A remote attacker could possibly use this issue to\nobtain sensitive information. This issue only affected Ubuntu 16.04 LTS,\nUbuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729)\n\nIt was discovered that Squid incorrectly handled certain ICP traffic. A\nremote attacker could possibly use this issue to cause Squid to crash,\nresulting in a denial of service. This issue only affected Ubuntu 16.04\nLTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748,\nCVE-2026-33526)\n\nIt was discovered that Squid incorrectly handled certain ICP requests. A\nremote attacker could possibly use this issue to obtain sensitive\ninformation. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nand Ubuntu 20.04 LTS. (CVE-2026-33515)","status":"published","published":"2026-10-20T13:59:52Z","modified":"2026-10-21T23:11:56.281723379Z","updated_at":"2026-11-02T16:58:26.907654Z"},{"id":"USN-8998-1","title":"squid vulnerability","description":"It was discovered that Squid incorrectly handled certain HTTP Transfer-\nEncoding headers. An attacker could possibly use this issue to perform\nHTTP request smuggling attacks, bypass security mechanisms, or poison\nweb caches.","status":"published","published":"2026-11-04T15:32:22Z","modified":"2026-11-05T11:58:20.271286584Z","updated_at":"2026-11-05T13:30:00.949926Z"}]}}