CGI::Simple versions 1.281 and earlier for Perl has a HTTP response splitting flaw

{
  "id": "5fefa6d71ffd34c9687ba6f2e319e5f0129539818839ac5da6dcfa97a40fa115",
  "url": "https://osv.dev/vulnerability/CVE-2025-40927",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CGI::Simple versions 1.281 and earlier for Perl has a HTTP response splitting flaw",
    "summary": "CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw This vulnerability is a confirmed HTTP response splitting flaw in CGI::Simple that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions. Although some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters. As a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks. The issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete. Impact By injecting %0A (newline) into a query string parameter, an attacker can: * Break the current HTTP header * Inject a new header or entire body * Deliver a script payload that is reflected in the server’s response That can lead to the following attacks: * reflected XSS * open redirect * cache poisoning * header manipulation",
    "evidence": "osv:CVE-2025-40927",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-40927",
      "aliases": [
        "CVE-2025-40927"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/manwar/cgi--simple",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c1a2e0b8f24804d33daac686666ac944363a630"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.282"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.280",
            "v1.27",
            "v1.26",
            "v1.25",
            "v1.24",
            "v1.23",
            "v1.22",
            "v1.21",
            "v1.20",
            "v1.19",
            "v1.18",
            "v1.17",
            "v1.16",
            "v1.15",
            "v1.14",
            "v1.13",
            "1.115",
            "1.111",
            "1.110",
            "1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40927.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.085423085Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320",
        "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm",
        "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm#L1031-1035",
        "https://rt.perl.org/Public/Bug/Display.html?id=21951",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40927.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40927",
        "https://github.com/manwar/CGI--Simple",
        "https://datatracker.ietf.org/doc/html/rfc7230#section-3",
        "https://owasp.org/www-community/attacks/HTTP_Response_Splitting"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-113"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40927.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40927",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508763,
  "published_at": "2025-08-29T00:10:07.161+00:00"
}