{"id":"CVE-2019-12526","aliases":["ALSA-2020:4743","CLSA-2026-1776878817","CLSA-2026-1776879277","DEBIAN-CVE-2019-12526","DLA-2028-1","DLA-2278-1","DSA-4682-1","EUVD-2019-4121","GHSA-rqc4-5489-hg7v","MGASA-2019-0382","RHSA-2020:4743","RLSA-2020:4743","SUSE-SU-2019:2975-1","SUSE-SU-2019:3067-1","SUSE-SU-2020:0661-1","SUSE-SU-2020:14460-1","UBUNTU-CVE-2019-12526","USN-4213-1","openSUSE-SU-2019:2540-1","openSUSE-SU-2019:2541-1","openSUSE-SU-2024:11403-1"],"status":"published","title":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap...","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. 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issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T16:41:57Z","modified":"2024-08-04T23:24:38.86Z","updated_at":"2026-11-02T14:20:24.025419Z"}],"euvd":[{"id":"EUVD-2019-4121","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T16:41:57Z","modified":"2024-08-04T23:24:38Z","updated_at":"2026-11-03T02:40:45.434408Z"}],"ghsa":[{"id":"GHSA-rqc4-5489-hg7v","title":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap...","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. 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This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T17:15:10.843Z","modified":"2026-06-17T02:14:49.63Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:05:38.993437Z"}],"osv":[{"id":"CVE-2019-12526","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T17:15:10.843Z","modified":"2026-10-24T10:30:41.352774615Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:10.718934Z"},{"id":"DEBIAN-CVE-2019-12526","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T17:15:10.843Z","modified":"2026-09-21T07:02:16.399903475Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:31.467893Z"},{"id":"RHSA-2020:4743","title":"Red Hat Security Advisory: squid:4 security, bug fix, and enhancement update","status":"published","published":"2024-09-16T04:22:06Z","modified":"2026-07-04T10:01:03Z","cvss":[{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RLSA-2020:4743","title":"Moderate: squid:4 security, bug fix, and enhancement update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nThe following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)\n\nSecurity Fix(es):\n\n* squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)\n\n* squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)\n\n* squid: Improper input validation in URI processor (CVE-2019-12523)\n\n* squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)\n\n* squid: Heap overflow issue in URN processing (CVE-2019-12526)\n\n* squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)\n\n* squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)\n\n* squid: Denial of service in cachemgr.cgi (CVE-2019-12854)\n\n* squid: Buffer overflow in URI processor (CVE-2019-18676)\n\n* squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)\n\n* squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)\n\n* squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)\n\n* squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)\n\n* squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)\n\n* squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)\n\n* squid: DoS in TLS handshake (CVE-2020-14058)\n\n* squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)\n\n* squid: Improper input validation could result in a DoS (CVE-2020-24606)\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\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.3 Release Notes linked from the References section.","status":"published","published":"2020-11-03T12:32:17Z","modified":"2026-02-04T20:00:07.394661Z","cvss":[{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2019-12526","description":"An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.","status":"published","published":"2019-11-26T17:15:00Z","modified":"2026-02-04T03:35:10.346616Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:19.202697Z"},{"id":"ALSA-2020:4743","title":"Moderate: squid:4 security, bug fix, and enhancement update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nThe following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)\n\nSecurity Fix(es):\n\n* squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)\n\n* squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)\n\n* squid: Improper input validation in URI processor (CVE-2019-12523)\n\n* squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)\n\n* squid: Heap overflow issue in URN processing (CVE-2019-12526)\n\n* squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)\n\n* squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)\n\n* squid: Denial of service in cachemgr.cgi (CVE-2019-12854)\n\n* squid: Buffer overflow in URI processor (CVE-2019-18676)\n\n* squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)\n\n* squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)\n\n* squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)\n\n* squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)\n\n* squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)\n\n* squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)\n\n* squid: DoS in TLS handshake (CVE-2020-14058)\n\n* squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)\n\n* squid: Improper input validation could result in a DoS (CVE-2020-24606)\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\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2020-11-03T12:32:17Z","modified":"2026-10-29T11:00:17.827616275Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"CLSA-2026-1776878817","title":"squid: Fix of 13 CVEs","description":"- CVE-2018-1000027: fix NULL pointer dereference in\n  clientFollowXForwardedForCheck for transactions without a client connection\n- CVE-2018-19131: fix XSS via X.509 certificate fields rendered unescaped in\n  SSL error pages\n- CVE-2019-12520: prevent cache poisoning by suppressing URL userinfo from\n  absolute URLs for non-FTP schemes\n- CVE-2019-12523: reject URIs with invalid scheme (non-alpha first char) and\n  malformed URN NID\n- CVE-2019-12526: add Must() guard in URN response handling to prevent\n  re-entry with zero-length buffer\n- CVE-2019-12528: fix FTP directory listing parser info leak from heap into\n  HTTP responses\n- CVE-2019-12529: fix Basic auth uudecode out-of-bounds read/write via proper\n  bounds checking\n- CVE-2019-13345: fix multiple XSS issues in cachemgr.cgi via rfc1738-escaping\n  user_name and auth parameters\n- CVE-2019-18676: cap URI scheme length and reject malformed scheme prefixes\n  to prevent buffer overflow in urlParse\n- CVE-2019-18677: prevent CSRF via append_domain truncation by rejecting\n  oversized domain appends\n- CVE-2019-18678: reject HTTP headers with whitespace between field-name and\n  colon per RFC 7230 to prevent request splitting\n- CVE-2019-18679: remove raw heap pointer from Digest nonce hash input to\n  prevent information disclosure and ASLR bypass\n- CVE-2019-18860: fix cachemgr.cgi XSS/info-disclosure via hostname parameter\n  validation","status":"published","published":"2026-10-21T13:51:54Z","modified":"2026-10-26T09:31:38.642283922Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1776879277","title":"squid: Fix of 13 CVEs","description":"- CVE-2018-1000027: fix NULL pointer dereference in\n  clientFollowXForwardedForCheck for transactions without a client connection\n- CVE-2018-19131: fix XSS via X.509 certificate fields rendered unescaped in\n  SSL error pages\n- CVE-2019-12520: prevent cache poisoning by suppressing URL userinfo from\n  absolute URLs for non-FTP schemes\n- CVE-2019-12523: reject URIs with invalid scheme (non-alpha first char) and\n  malformed URN NID\n- CVE-2019-12526: add Must() guard in URN response handling to prevent\n  re-entry with zero-length buffer\n- CVE-2019-12528: fix FTP directory listing parser info leak from heap into\n  HTTP responses\n- CVE-2019-12529: fix Basic auth uudecode out-of-bounds read/write via proper\n  bounds checking\n- CVE-2019-13345: fix multiple XSS issues in cachemgr.cgi via rfc1738-escaping\n  user_name and auth parameters\n- CVE-2019-18676: cap URI scheme length and reject malformed scheme prefixes\n  to prevent buffer overflow in urlParse\n- CVE-2019-18677: prevent CSRF via append_domain truncation by rejecting\n  oversized domain appends\n- CVE-2019-18678: reject HTTP headers with whitespace between field-name and\n  colon per RFC 7230 to prevent request splitting\n- CVE-2019-18679: remove raw heap pointer from Digest nonce hash input to\n  prevent information disclosure and ASLR bypass\n- CVE-2019-18860: fix cachemgr.cgi XSS/info-disclosure via hostname parameter\n  validation","status":"published","published":"2026-04-23T18:38:25Z","modified":"2026-06-01T00:33:26.251745206Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"DLA-2028-1","title":"squid3 - security update","status":"published","published":"2019-12-10T00:00:00Z","modified":"2026-03-09T01:18:28.697382Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DLA-2278-1","title":"squid3 - security update","status":"published","published":"2020-07-10T00:00:00Z","modified":"2026-03-09T01:21:50.659924Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DSA-4682-1","title":"squid - security update","status":"published","published":"2020-05-08T00:00:00Z","modified":"2026-03-09T02:09:44.67451Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2019-0382","title":"Updated squid packages fix security vulnerabilities","description":"Potential remote code execution during URN processing (CVE-2019-12526).\n\nMultiple improper validations in URI processing (CVE-2019-12523,\nCVE-2019-18676).\n\nCross-Site Request Forgery in HTTP Request processing (CVE-2019-18677).\n\nIncorrect message parsing which could have led to HTTP request splitting\nissue (CVE-2019-18678).\n\nInformation disclosure when processing HTTP Digest Authentication\n(CVE-2019-18679).\n","status":"published","published":"2019-12-13T18:25:24Z","modified":"2026-04-16T04:42:25.598836295Z","updated_at":"2026-11-02T15:49:41.151324Z"},{"id":"openSUSE-SU-2019:2540-1","title":"Security update for squid","description":"This update for squid to version 4.9 fixes the following issues:\n\nSecurity issues fixed: \n\n- CVE-2019-13345: Fixed multiple cross-site scripting vulnerabilities in cachemgr.cgi (bsc#1140738).\n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n\nOther issues addressed:\n\n * Fixed DNS failures when peer name was configured with any upper case characters\n * Fixed several rock cache_dir corruption issues\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-11-21T13:25:53Z","modified":"2026-02-04T03:02:00.221686Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"openSUSE-SU-2019:2541-1","title":"Security update for squid","description":"This update for squid to version 4.9 fixes the following issues:\n\nSecurity issues fixed: \n\n- CVE-2019-13345: Fixed multiple cross-site scripting vulnerabilities in cachemgr.cgi (bsc#1140738).\n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n\nOther issues addressed:\n\n * Fixed DNS failures when peer name was configured with any upper case characters\n * Fixed several rock cache_dir corruption issues\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-11-21T13:26:12Z","modified":"2026-02-04T03:23:00.068716Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"openSUSE-SU-2024:11403-1","title":"squid-4.16-1.5 on GA media","description":"These are all security issues fixed in the squid-4.16-1.5 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:28:26.444707Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2019:2975-1","title":"Security update for squid","description":"This update for squid to version 4.9 fixes the following issues:\n\nSecurity issues fixed: \n\n- CVE-2019-13345: Fixed multiple cross-site scripting vulnerabilities in cachemgr.cgi (bsc#1140738).\n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n\nOther issues addressed:\n\n * Fixed DNS failures when peer name was configured with any upper case characters\n * Fixed several rock cache_dir corruption issues\n","status":"published","published":"2019-11-14T16:02:41Z","modified":"2026-02-04T03:09:27.896801Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"id":"SUSE-SU-2019:3067-1","title":"Security update for squid","description":"This update for squid to version 4.9 fixes the following issues:\n\t  \nSecurity issues fixed: \n\n- CVE-2019-13345: Fixed multiple cross-site scripting vulnerabilities in cachemgr.cgi (bsc#1140738).\n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n\nOther issues addressesd:\n\n * Fixed DNS failures when peer name was configured with any upper case characters\n * Fixed several rock cache_dir corruption issues\n","status":"published","published":"2019-11-26T09:20:35Z","modified":"2026-02-04T03:17:56.522082Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"id":"SUSE-SU-2020:0661-1","title":"Security update for squid","description":"This update for squid fixes the following issues:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689). \n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\t  \n","status":"published","published":"2020-03-12T16:01:37Z","modified":"2026-02-04T03:24:31.697905Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"id":"SUSE-SU-2020:14460-1","title":"Security update for squid3","description":"This update for squid3 fixes the following issues:\n\n- Fixed a Cache Poisoning and Request Smuggling\n  attack (CVE-2020-15049, bsc#1173455)\n- Fixed incorrect buffer handling that can\n  result in cache poisoning, remote execution, and\n  denial of service attacks when processing ESI responses\n  (CVE-2019-12519, CVE-2019-12521, bsc#1169659)\n\n- Fixed handling of hostname in\n  cachemgr.cgi (CVE-2019-18860, bsc#1167373)\n- Fixed a potential remote execution vulnerability\n  when using HTTP Digest Authentication (CVE-2020-11945, bsc#1170313)\n- Fixed a potential ACL bypass, cache-bypass\n  and cross-site scripting attack when processing invalid HTTP\n  Request messages (CVE-2019-12520, CVE-2019-12524, bsc#1170423)\n- Fixed a potential denial of service when\n  processing TLS certificates during HTTPS connections\n  (CVE-2020-14059, bsc#1173304)\n\n- Fixed a potential denial of service associated\n  with incorrect buffer management of HTTP Basic Authentication\n  credentials (bsc#1141329, CVE-2019-12529)\n- Fixed an incorrect buffer management resulting\n  in vulnerability to a denial of service during processing of\n  HTTP Digest Authentication credentials (bsc#1141332, CVE-2019-12525)\n- Fix XSS via user_name or auth parameter\n  in cachemgr.cgi (bsc#1140738, CVE-2019-13345)\n- Fixed a potential code execution vulnerability\n  (CVE-2019-12526, bsc#1156326)\n- Fixed HTTP Request Splitting in HTTP\n  message processing and information disclosure in\n  HTTP Digest Authentication\n  (CVE-2019-18678, CVE-2019-18679, bsc#1156323, bsc#1156324)\n- Fixed a security issue allowing a remote\n  client ability to cause use a buffer overflow when squid is\n  acting as reverse-proxy.\n  (CVE-2020-8449, CVE-2020-8450, bsc#1162687)\n- Fixed a security issue allowing for information\n  disclosure in FTP gateway (CVE-2019-12528, bsc#1162689)\n- Fixed a security issue in ext_lm_group_acl\n  when processing NTLM Authentication credentials.\n  (CVE-2020-8517, bsc#1162691)\n\n- Fixed Cross-Site Request Forgery in\n  HTTP Request processing (CVE-2019-18677, bsc#1156328)\n\n- Disable urn parsing and parsing of\n  unknown schemes (bsc#1156329, CVE-2019-12523, CVE-2019-18676)\n","status":"published","published":"2020-08-24T12:06:51Z","modified":"2025-05-02T04:08:43.365999Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"USN-4213-1","title":"squid, squid3 vulnerabilities","description":"Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly\nhandled certain URN requests. A remote attacker could possibly use this\nissue to bypass access checks and access restricted servers. This issue was\nonly addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-12523)\n\nJeriko One discovered that Squid incorrectly handed URN responses. A remote\nattacker could use this issue to cause Squid to crash, resulting in a\ndenial of service, or possibly execute arbitrary code. (CVE-2019-12526)\n\nAlex Rousskov discovered that Squid incorrectly handled certain strings. A\nremote attacker could possibly use this issue to cause Squid to crash,\nresulting in a denial of service. This issue only affected Ubuntu 19.04.\n(CVE-2019-12854)\n\nJeriko One and Kristoffer Danielsson discovered that Squid incorrectly\nhandled certain input. A remote attacker could use this issue to cause\nSquid to crash, resulting in a denial of service, or possibly execute\narbitrary code. This issue was only addressed in Ubuntu 19.04 and Ubuntu\n19.10. (CVE-2019-18676)\n\nKristoffer Danielsson discovered that Squid incorrectly handled certain\nmessages. This issue could result in traffic being redirected to origins\nit should not be delivered to. (CVE-2019-18677)\n\nRégis Leroy discovered that Squid incorrectly handled certain HTTP\nrequest headers. A remote attacker could use this to smuggle HTTP requests\nand corrupt caches with arbitrary content. (CVE-2019-18678)\n\nDavid Fifield discovered that Squid incorrectly handled HTTP Digest\nAuthentication. A remote attacker could possibly use this issue to obtain\npointer contents and bypass ASLR protections. (CVE-2019-18679)\n","status":"published","published":"2019-12-04T17:28:48Z","modified":"2026-02-10T04:41:43Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}