Vulnerability Management , Patch/Configuration Management , AI/ML , Government Regulations , Government security CISA reportedly considers 3-day patch deadline for KEV flaws May 5, 2026 Share By Laura French The Cybersecurity and Infrastructure Security Agency (CISA) is reportedly considering shortening remediation deadlines for vulnerabilities added to the Known Exploited Vulnerabilities catalog, according to Reuters . Citing two sources familiar with the matter, Reuters reported Friday that CISA Acting Director Nick Anderson and U.S. National Cyber Director Sean Cairncross were discussing proposals to cut KEV deadlines for federal civilian executive branch agencies from an average of two to three weeks to just three days. The discussion was reportedly spurred by the emergence of advanced AI tools such as Anthropic’s Claude Mythos and OpenAI’s GPT-5.4-Cyber that have the potential to identify and exploit flaws at unprecedented speed. A CISA spokesperson declined to comment on whether such discussions were taking place or whether a decision had been made. “Having spent the last decade working with federal CIOs and CISOs on this challenge — albeit before the release of Mythos and GPT-5.4-Cyber — most organizations are not yet equipped to safely validate, prioritize, and remediate critical or actively exploited vulnerabilities at that pace without risking service disruption or incomplete fixes,” Matthew Hartman, chief strategy officer at Merlin Group and former deputy executive assistant director for cybersecurity at CISA, told SC Media. “Closing that gap will require sharper prioritization, along with significant investment in automation and real-time asset visibility,” Hartman added. Claude Mythos leaves cybersecurity industry scrambling The unveiling of Claude Mythos shook the cybersecurity world last month, spurring discussions among government officials on how to prepare for the potential of rapid exploit development. Anthropic said Mythos greatly outperforms any of its previous models in autonomously developing full exploit chains and in some cases can develop these exploits within hours. Due to the potential risk, the company has only released the model in preview to select organizations via a project it calls Project Glasswing . U.S. Treasury Secretary Scott Bessent and Federal Reserve Chair Jay Powell reportedly called an urgent meeting with top banking executives shortly after Mythos was announced on April 7 to discuss the risk to financial institutions. White House Chief of Staff Susie Wiles also met with Anthropic CEO Dario Amodei to discuss the model’s capabilities, according to the Associated Press. “CISA’s proposal simply reflects the reality that the speed of AI-driven cyberattacks provide threat actors a clear advantage over cyber defenders operating at a much slower speed. Pushing organizations to remediate vulnerabilities faster than threat actors can exploit them is the right focus to have, and is overdue (even before Mythos the time to exploit a new vulnerability has come down to less than a day),” noted John Gallagher, vice president of Viakoo Labs, in comments to SC Media. Reports on the average time-to-exploit (TTE) newly disclosed vulnerabilities varies, with Flashpoint reporting that the average TTE was 44 days in 2025, and Cybermindr reporting the average TTE to be just five days the same year. What’s clear is that there have been many cases in recent years where serious vulnerabilities have been exploited within days or hours; just last week, a critical SQL injection bug in LiteLLM was exploited within 36 hours . Additionally, “Copy Fail,” a high-severity Linux kernel flaw that can enable local privilege escalation, was disclosed on April 29 and added to the KEV catalog just two days later . The fear is that advanced AI tools will make such cases much more common, and experts who spoke with SC Media said organizations are already falling far behind what will be necessary if this fear comes to fruition. “Technical debt, legacy systems, and fragmented ownership models create friction that no mandate can eliminate overnight, and government agencies are already resource constrained with recent staff layoffs and lack of funding and expertise,” said BeyondTrust Chief Security Advisor Morey Haber. “This raises an important question: Who absorbs the operational burden when timelines shrink but capacity does not?” Louis Eichenbaum, federal CTO at ColorTokens, agrees there is a limit to how fast legacy and operational technology (OT) systems used at many federal agencies can be patched without disrupting critical functions, creating a need to rethink remediation strategy as exploit timelines shrink. “Agencies must complement patching with a containment strategy. This is where microsegmentation becomes critical. By implementing granular microsegmentation, agencies can create secure, policy-enforced boundaries around vulnerable systems restricting traffic flows and preventing lateral movement even if a system is compromised,” said Eichenbaum. Black Duck Senior Director of Solution Management Collin Hogue-Spears agreed that simply patching vulnerabilities faster as they are exploited is not a viable solution, and that organizations need policies that adequately prepare them to react to increasingly rapid threats. “Security leaders must replace emergency-patch heroics with pre-staged remediation lanes: named system owners, automated rollback testing, asset inventories, and pre-approved compensation controls. The 72-hour proposal does not change what good remediation looks like. It changes how much warning you get before you need it,” Hogue-Spears said. An In-Depth Guide to AI Get essential knowledge and practical strategies to use AI to better your security program. Learn More Laura French Related Vulnerability Management Copy Fail bug added to CISA’s list of known exploited vulnerabilities Steve Zurier May 4, 2026 CISA flags “Copy Fail” Linux bug as exploited, urging immediate patching across systems. Malware New botnet targets gaming servers via misconfigured Jenkins SC Staff May 4, 2026 The attackers gained initial access by abusing the scriptText endpoint of the Jenkins server, achieving remote code execution (RCE) through a Groovy script. 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