Vulnerability-Lookup

PYSEC-2026-1228

Vulnerability from pysec - Published: 2026-07-07 16:02 - Updated: 2026-07-07 17:23

Details

ReDoS in strip_whitespaces() function in cps/string_helper.py in Calibre Web and Autocaliweb allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. This issue affects Calibre Web: 0.6.24 (Nicolette); Autocaliweb: from 0.7.0 before 0.7.1.

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Impacted products

Name	purl
calibreweb	pkg:pypi/calibreweb

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "calibreweb",
        "purl": "pkg:pypi/calibreweb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.6.24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.12",
        "0.6.13",
        "0.6.14",
        "0.6.15",
        "0.6.16",
        "0.6.17",
        "0.6.18",
        "0.6.19",
        "0.6.20",
        "0.6.21",
        "0.6.22",
        "0.6.23",
        "0.6.24"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-6998",
    "GHSA-2g7m-ph9x-7q7m"
  ],
  "details": "ReDoS in strip_whitespaces() function in cps/string_helper.py in Calibre Web and Autocaliweb allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. This issue affects Calibre Web: 0.6.24 (Nicolette); Autocaliweb: from 0.7.0 before 0.7.1.",
  "id": "PYSEC-2026-1228",
  "modified": "2026-07-07T17:23:52.607215Z",
  "published": "2026-07-07T16:02:58.600303Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6998"
    },
    {
      "type": "WEB",
      "url": "https://fluidattacks.com/advisories/megadeth"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gelbphoenix/autocaliweb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/janeczku/calibre-web"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/calibreweb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-2g7m-ph9x-7q7m"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Calibre Web and Autocaliweb have a ReDoS vulnerability"
}

CVE-2025-6998 (GCVE-0-2025-6998)

Vulnerability from cvelistv5 – Published: 2025-07-24 19:39 – Updated: 2025-07-25 13:17

Title

Calibre Web 0.6.24 & Autocaliweb 0.7.0 - ReDoS

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

Fluid Attacks

References

3 references

URL	Tags
https://fluidattacks.com/advisories/megadeth	third-party-advisory
https://github.com/janeczku/calibre-web	product
https://github.com/gelbphoenix/autocaliweb	product

Impacted products

2 products

Vendor	Product	Version
Calibre Web	Calibre Web	Affected: 0.6.24 (custom)
Autocaliweb	Autocaliweb	Affected: 0.7.0 , < 0.7.1 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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                "id": "CVE-2025-6998",
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                  },
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-24T19:50:08.633333Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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          "platforms": [
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          "product": "Calibre Web",
          "vendor": "Calibre Web",
          "versions": [
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          "defaultStatus": "unaffected",
          "platforms": [
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          "product": "Autocaliweb",
          "vendor": "Autocaliweb",
          "versions": [
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              "status": "affected",
              "version": "0.7.0",
              "versionType": "custom"
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      "cpeApplicability": [
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              "cpeMatch": [
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      "impacts": [
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          "url": "https://github.com/janeczku/calibre-web"
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GHSA-2G7M-PH9X-7Q7M

Vulnerability from github – Published: 2025-07-24 21:30 – Updated: 2025-07-28 14:53

Summary

Calibre Web and Autocaliweb have a ReDoS vulnerability

Details

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "calibreweb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.6.24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-6998"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-28T14:53:43Z",
    "nvd_published_at": "2025-07-24T20:15:27Z",
    "severity": "HIGH"
  },
  "details": "ReDoS in strip_whitespaces() function in cps/string_helper.py in Calibre Web and Autocaliweb allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. This issue affects Calibre Web: 0.6.24 (Nicolette); Autocaliweb: from 0.7.0 before 0.7.1.",
  "id": "GHSA-2g7m-ph9x-7q7m",
  "modified": "2025-07-28T14:53:43Z",
  "published": "2025-07-24T21:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6998"
    },
    {
      "type": "WEB",
      "url": "https://fluidattacks.com/advisories/megadeth"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gelbphoenix/autocaliweb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/janeczku/calibre-web"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Calibre Web and Autocaliweb have a ReDoS vulnerability"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

PYSEC-2026-1228

CVE-2025-6998 (GCVE-0-2025-6998)

GHSA-2G7M-PH9X-7Q7M

Tags

Sightings

Nomenclature