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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-19487",
      "cwe": {
        "id": "CWE-670",
        "name": "Always-Incorrect Control Flow Implementation"
      },
      "notes": [
        {
          "category": "description",
          "text": "Perl versions from 5.9.4 before 5.41.9 produce incorrect regular expression match results when a stale failure flag ends the Aho-Corasick prescan early in S_find_byclass.\n\nThe prescan walks the subject for positions where the full pattern could match, and the engine tries it from the leftmost one recorded. A failing transition sets the failed flag, and a later successful transition does not clear it, so the prescan reads the stale flag as a failure and stops before it can record a candidate that starts earlier. It takes a subject where one candidate is recorded and a later character then forces a fallback through a fail link that succeeds.\n\nExample:\n\n  \"ABCDE\" =~ m/ABCF|BCDE|C/;    # matches C at offset 2, not BCDE\n  \"ABCDE\" =~ m/ABCF|BCDE|C(G)/; # no match, BCDE missed\n\nAn alternation like this can miss input it should match, or match it on the wrong branch, so an access or filtering decision made from the result can be wrong.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-19487"
        },
        {
          "category": "external",
          "summary": "https://github.com/Perl/perl5/commit/1a21abacaf6f684928bae8baaa153733c8c238eb.patch",
          "url": "https://github.com/Perl/perl5/commit/1a21abacaf6f684928bae8baaa153733c8c238eb.patch"
        },
        {
          "category": "external",
          "summary": "https://github.com/Perl/perl5/issues/22892",
          "url": "https://github.com/Perl/perl5/issues/22892"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/08/13/8",
          "url": "http://www.openwall.com/lists/oss-security/2026/08/13/8"
        }
      ],
      "release_date": "2026-08-13T16:17:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-10T14:34:55.469390Z",
          "details": "This is a correctness flaw in Perl’s regex engine that only mis-selects matches in a narrow class of alternation patterns optimized via Aho‑Corasick; it has no memory‑safety or code‑execution impact. Exploitation requires an application to feed attacker‑controlled input into exactly such a pattern and make security decisions that depend on leftmost‑first alternation order, while straightforward literals, non‑alternation patterns, or anchored matches are unaffected (reflected in the high attack complexity and no availability impact). In centrally managed server/VM environments that do not expose these specific Perl regex constructs on security‑critical network paths, practical exploitability is low, so this CVE can be safely deprioritized.",
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