Security firm Calif just dropped a major advisory: popular open-source web proxy/cache software Squid is affected by a longstanding memory-disclosure-style bug dubbed “Squidbleed” (CVE-2026-47729). Like earlier “heartbleed”-type incidents, the core issue is simple and scary: under certain conditions, Squid may perform an out-of-bounds read, meaning internal memory contents can be exposed to an attacker. Calif notes that a maliciously crafted request could trigger the faulty code path, potentially leaking sensitive data from HTTP traffic—think passwords, API keys, or other secrets that should never leave the server. What makes this especially worrying: the flaw reportedly dates back as far as ~29 years. Calif says it used advanced AI-assisted analysis (Anthropic Claude Mythos) to map Squid’s internal structure and produce a PoC concept that helps researchers validate the risk. The root cause involves parsing issues in FTP directory listings, where mismatched whitespace handling leads to pointer/termination logic errors in C. Fixes were proposed in mid-April and shipped in Squid 7.6 (released by early June). If you run Squid, prioritize updating ASAP. #CyberSecurity #Squid #Vulnerability #MemoryLeak #Infosec #CVE
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