Cisco searched for IOS XR bugs and found so many it rolled them into an update release

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  "company": {
    "name": "Cisco",
    "domain": "cisco.com"
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  "data": {
    "url": "https://www.theregister.com/security/2026/09/04/cisco-searched-for-ios-xr-bugs-and-found-so-many-it-rolled-them-into-an-update-release/5294410",
    "title": "Cisco searched for IOS XR bugs and found so many it rolled them into an update release",
    "excerpt": "security Three critical vulns demand your attention, one a make-me-root mess in Nexus 9000 Series Switches that you can mitigate, not fix Cisco has warned its customers of three critical-rated flaws in its products. Two of them are present in the Cisco IOS XR operating system that powers the company’s carrier-grade kit. CVE-2026-20274 scores 9.8 on the ten-point CVSS scale and covers a buffet of buffering issues, the potential for out-of-bounds writes, and the chance to initialize resources with an insecure default. CVE-2026-20279 is another 9.8-rated flaw. Cisco says it’s an improper access control problem that covers “improper certificate validation, missing authentication for critical function, missing authorization, and incorrect authorization.” Cisco also spotted a trio of 8.8-rated flaws, plus another rated 8.6 and one more scored at 8.2 The company’s advisory says the company found the flaws after “a comprehensive internal security review,” language that perhaps hints at Cisco dabbling with Mythos and/or other bug-finding models. The fix is in: Cisco has published new versions of IOS XR that fix the problems and “strongly recommends” customers adopt them. Cisco’s support organization spotted the third critical flaw it revealed on Wednesday. CVE-2026-20212 is a tad embarrassing because the cause is a bad integration with Cisco’s own Silicon One networking processors that...",
    "product": "IOS XR",
    "summary": "Cisco has released new versions of its IOS XR operating system to fix multiple security vulnerabilities, including two critical-rated flaws.",
    "planning": false,
    "image_url": "https://image.theregister.com/5294415.jpg?imageId=5294415&x=0&y=0&cropw=100&croph=100&panox=0&panoy=0&panow=100&panoh=100&width=1200&height=683",
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      "name": "IOS XR",
      "full_text": "new versions of IOS XR",
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      "release_type": "version"
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      "general_technology",
      "security"
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    "published_at": "2026-09-04T02:18:36Z",
    "article_sentence": "Cisco has published new versions of IOS XR that fix the problems and “strongly recommends” customers adopt them."
  }
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