Squid Proxy - HTTP Authentication Credentials Disclosure

Squid versions prior to 7.2 fail to redact HTTP authentication credentials in error page responses. The Authorization header value is embedded in plain text inside the mailto: diagnostic block when Squid generates an error page e.g. ERRDNSFAIL. id: CVE-2025-62168 info: name: Squid Proxy - HTTP...

CVE-2026-47729

A flaw was found in Squid. Due to improper input validation, an out-of-bounds read can occur in the FTP gateway. This issue allows an authenticated and trusted client to read memory from random transactions when accessing a misbehaving FTP server using the Squid gateway feature. Mitigation When F...

CVE-2026-50012

A flaw was found in Squid. Due to improper input validation, a heap-based buffer overflow can occur when processing cache digests. This issue allows a trusted server to cause a denial of service when sending specially crafted replies to cachedigest request messages. Mitigation To mitigate this...

29-Year-Old Squid Proxy Bug 'Squidbleed' Can Leak Cleartext HTTP Requests

A heap over-read in the Squid web proxy can leak another user's cleartext HTTP request, including any credentials or session tokens it carries, to anyone already allowed to send traffic through the same proxy. The bug traces to a 1997 FTP-parsing change and is still live in Squid's default...

Astra Linux – Vulnerability in Squid

Squid is a caching proxy for the web that supports HTTP, HTTPS, FTP, and other protocols. Due to a Buffer Overread bug, Squid is vulnerable to a Denial of Service attack targeting the Squid HTTP message processing mechanism. This bug has been fixed in Squid version 6.5. Users are advised to...

Astra Linux – Vulnerability in Squid

Squid encounters issues with the improper handling of ASN.1 encoding for long SNMP OIDs in version 7.1. This issue occurs in the asnbuildobjid function within lib/snmplib/asn1.c...

Astra Linux – Vulnerability in Squid

A vulnerability was discovered in Squid before versions 4.15 and 5.x before version 5.0.6. Due to incorrect parser validation, this vulnerability allows for a Denial of Service attack against the Cache Manager API. This enables a trusted client to trigger memory leaks, which over time can lead to...

Astra Linux – Vulnerability in Squid

A issue was discovered in Squid 4.x before 4.15, and in 5.x before 5.0.6. If a remote server sends a certain response header via HTTP or HTTPS, it can lead to a denial of service. This header can potentially appear in legitimate network traffic...

Astra Linux – Vulnerability in Squid

In Squid 3.x through 3.5.28, 4.x through 4.17, and 5.x before 5.6, a Denial of Service can occur when processing long Gopher server responses due to improper buffer management...

Astra Linux – Vulnerability in Squid

Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URNs due to incorrect buffer management. This issue has been fixed in version 6.4. To address this problem, disable URN access...

Astra Linux – Vulnerability in Squid

Squid is a caching proxy for the web that supports HTTP, HTTPS, FTP, and other protocols. Due to an out-of-bounds write vulnerability when assigning ESI variables, Squid is susceptible to a memory corruption error. This error can lead to a denial-of-service attack...

Astra Linux – Vulnerability in Squid

In versions 4.14 and 5.x through 5.0.5, in some configurations, the Squid vulnerability allows information disclosure due to an out-of-bounds read in the WCCP protocol data. This vulnerability can be exploited as part of a chain for remote code execution, as there is no one to stop such attacks...

Astra Linux – Vulnerability in Squid

A issue was discovered in Squid before version 4.15 and 5.x before version 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack targeting all clients using the proxy through HTTP Range request processing...

Squid < 7.6 Heap-based Buffer Overflow

The version of Squid on the remote host is prior to 7.6. It is, therefore, affected by a heap-based buffer overflow vulnerability: - Due to an Improper Input Validation bug, Squid is vulnerable to a Heap-based Buffer Overflow attack against cache digests. This problem allows a trusted server to...

Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Squid vulnerabilities (USN-8435-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8435-1 advisory. It was discovered that Squid incorrectly handled FTP gateway processing under certain circumstances, which could result i...

Friday Squid Blogging: Squid-Inspired Fluid Pump

This fluid pump was inspired by the way squids propel themselves through the water. As usual, you can also use this squid post to talk about the security stories in the news that I haven't covered. Blog moderation policy...

Linux Distros Unpatched Vulnerability : CVE-2026-47729

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Debian Linux - squid - None Ubuntu Linux - Out-of-bounds Read attack against the FTP gateway CVE-2026-47729 Note that Nessus relies on the presence of the packa...

Linux Distros Unpatched Vulnerability : CVE-2026-50012

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Due to an Improper Input Validation bug, Squid is vulnerable toa Heap-based Buffer Overflow attack against cache digests. This problem allows a trusted server t...

PT-2026-49606

Name of the Vulnerable Software and Affected Versions squid-cache Squid affected versions not specified Description A heap-based buffer overflow occurs during the processing of cache digests. A heap-based buffer overflow is a memory corruption issue where a program writes more data to a buffer...

TencentOS Server 4: squid (TSSA-2026:0346)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0346 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities...