Vulnerability-Lookup

GHSA-XH68-JPQJ-PV76

Vulnerability from github – Published: 2026-11-03 18:31 – Updated: 2026-11-03 18:31

Details

Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server's OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process.

Severity

4.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

6.9 (Medium)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-121544"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-03T16:17:25Z",
    "severity": "MODERATE"
  },
  "details": "Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server\u0027s OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process.",
  "id": "GHSA-xh68-jpqj-pv76",
  "modified": "2026-11-03T18:31:03Z",
  "published": "2026-11-03T18:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121544"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader/issues/1654"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader/commit/cbc79a1ab5cbbd61c8252d6ab3cc6dbb694663b8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L167-L194"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L384-L431"
    },
    {
      "type": "WEB",
      "url": "https://github.com/koodo-reader/koodo-reader/compare/205539043b0a2afd9fd8bf99ef8434bd1833c2bf...cbc79a1ab5cbbd61c8252d6ab3cc6dbb694663b8"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/koodo-reader-through-2.4.6-path-traversal-via-opds-cover-and-download-handlers"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-121544 (GCVE-0-2026-121544)

Vulnerability from cvelistv5 – Published: 2026-11-03 15:17 – Updated: 2026-11-03 16:49

Title

Koodo Reader through 2.4.6 Path Traversal via OPDS Cover and Download Handlers

Summary

Severity

6.9 (Medium)


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

4.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-03 16:48 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7403 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/koodo-reader/koodo-reader/issu…	issue-tracking
https://github.com/koodo-reader/koodo-reader	product
https://github.com/koodo-reader/koodo-reader/comm…	patch
https://github.com/koodo-reader/koodo-reader/blob…	technical-description
https://github.com/koodo-reader/koodo-reader/blob…	technical-description
https://github.com/koodo-reader/koodo-reader/comp…	technical-description
https://www.vulncheck.com/advisories/koodo-reader…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
koodo-reader	koodo-reader	Affected: 0 , ≤ 2.4.6 (semver)

Date Public

2026-10-20 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-121544",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-03T16:48:49.441924Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-03T16:49:21.690Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/koodo-reader/koodo-reader/issues/1654"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/koodo-reader/koodo-reader",
          "product": "koodo-reader",
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          "versions": [
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              "lessThanOrEqual": "2.4.6",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "George Chen"
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      "datePublic": "2026-10-20T00:00:00.000Z",
      "descriptions": [
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          "lang": "en",
          "value": "Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server\u0027s OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process."
        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "HIGH",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
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            "vulnIntegrityImpact": "NONE"
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        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "name": "GitHub Issue #1654",
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        },
        {
          "tags": [
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          "url": "https://github.com/koodo-reader/koodo-reader"
        },
        {
          "name": "Fix commit",
          "tags": [
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          "url": "https://github.com/koodo-reader/koodo-reader/commit/cbc79a1ab5cbbd61c8252d6ab3cc6dbb694663b8"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L167-L194"
        },
        {
          "tags": [
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          "url": "https://github.com/koodo-reader/koodo-reader/compare/205539043b0a2afd9fd8bf99ef8434bd1833c2bf...cbc79a1ab5cbbd61c8252d6ab3cc6dbb694663b8"
        },
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          "tags": [
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    "assignerShortName": "VulnCheck",
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    "datePublished": "2026-11-03T15:17:05.228Z",
    "dateReserved": "2026-11-03T14:46:12.571Z",
    "dateUpdated": "2026-11-03T16:49:21.690Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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