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CVE-2026-50012— Squid: Memory corruption in cache_digest reply handling

Quick assessment

Affected
squid-cache squid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

squid-cache Squid是squid-cache团队开源的一套代理及Web缓存服务器软件。 squid-cache Squid 7.6之前版本存在安全漏洞，该漏洞源于缓存摘要回复处理中的输入验证不当，可能导致受信任的对等点发送恶意回复时触发基于堆的缓冲区溢出。

CVSS 5.5 · Medium EPSS 2.68% · P85

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
squid-cache squid < 7.6 affected
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I. Basic Information for CVE-2026-50012

Vulnerability Information
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Vulnerability Title
Squid: Memory corruption in cache_digest reply handling
Source: CVE Program / CVE List V5
Vulnerability Description
Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
squid-cache Squid 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
squid-cache Squid是squid-cache团队开源的一套代理及Web缓存服务器软件。 squid-cache Squid 7.6之前版本存在安全漏洞，该漏洞源于缓存摘要回复处理中的输入验证不当，可能导致受信任的对等点发送恶意回复时触发基于堆的缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
squid-cache squid < 7.6 -

II. Public POCs for CVE-2026-50012

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III. Intelligence Information for CVE-2026-50012

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Patches & Fixes for CVE-2026-50012 (2)

Vendor Advisories for CVE-2026-50012 (1)

Vendor Pages for CVE-2026-50012 (1)

IV. Related Vulnerabilities

Same product: squid
Same vendor: squid-cache
Same weakness: CWE-20

V. Comments for CVE-2026-50012

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