Vulnerability-Lookup

CVE-2026-67435 (GCVE-0-2026-67435)

Vulnerability from cvelistv5 – Published: 2026-07-29 19:39 – Updated: 2026-07-29 19:55

Title

linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect

Summary

linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations. Prior to version 6.0.0, lib.url.fetch() followed cross-origin redirects while forwarding caller-supplied credential headers other than Authorization and Cookie, allowing a malicious redirect-capable server to receive headers such as X-Auth-Token from authenticated monitoring requests. This issue is fixed in version 6.0.0.

Severity

6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 19:55 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/Linuxfabrik/monitoring-plugins…	x_refsource_CONFIRM
https://github.com/Linuxfabrik/lib/commit/6573ff9…	x_refsource_MISC
https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Linuxfabrik	monitoring-plugins	Affected: < 6.0.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-67435

Vulnerability from fkie_nvd - Published: 2026-07-29 20:17 - Updated: 2026-07-30 19:27

Severity

6.0 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Linuxfabrik/lib/commit/6573ff9347e541200305d278d2663d2e54e052ff
	security-advisories@github.com	https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0
	security-advisories@github.com	https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-4jc5-g844-4x33

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "monitoring-plugins",
          "vendor": "Linuxfabrik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.0.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations. Prior to version 6.0.0, lib.url.fetch() followed cross-origin redirects while forwarding caller-supplied credential headers other than Authorization and Cookie, allowing a malicious redirect-capable server to receive headers such as X-Auth-Token from authenticated monitoring requests. This issue is fixed in version 6.0.0."
    }
  ],
  "id": "CVE-2026-67435",
  "lastModified": "2026-07-30T19:27:23.630",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
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          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.0,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
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          "privilegesRequired": "LOW",
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          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/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",
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GHSA-4JC5-G844-4X33

Vulnerability from github – Published: 2026-07-30 14:46 – Updated: 2026-07-30 14:46

Summary

linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect

Details

Summary

lib.url.fetch() follows HTTP redirects (follow_redirects=True). httpx strips only Authorization and Cookie when a redirect crosses the origin, so any other caller-supplied credential header (a session token such as Redfish's X-Auth-Token, an API key, ...) was still sent to the redirect target. A malicious or redirect-capable server can therefore answer an authenticated request with a 3xx to an attacker-chosen host and receive the credential (server-side request forgery + token disclosure). The pre-httpx urllib implementation was worse: it forwarded every header, including Authorization, across cross-host redirects.

Impact

Any plugin that authenticates to a host with a non-standard auth header and follows that host's redirects can be coerced into sending the credential, and an authenticated request, to another host the monitoring server can reach. The concrete case is the Redfish checks (X-Auth-Token), but the flaw is in the shared fetch() and affects every consumer.

Patches

Fixed in linuxfabrik-lib 6.0.0 (commit 6573ff9). On a cross-origin redirect (any scheme/host/port change other than a plain same-host HTTP-to-HTTPS upgrade) fetch() now keeps only benign transport headers and drops every other caller-supplied header, so credentials never follow a redirect to a different origin.

Severity

6.0 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "linuxfabrik-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-67435"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-30T14:46:13Z",
    "nvd_published_at": "2026-07-29T20:17:12Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n`lib.url.fetch()` follows HTTP redirects (`follow_redirects=True`). httpx strips only `Authorization` and `Cookie` when a redirect crosses the origin, so any other caller-supplied credential header (a session token such as Redfish\u0027s `X-Auth-Token`, an API key, ...) was still sent to the redirect target. A malicious or redirect-capable server can therefore answer an authenticated request with a `3xx` to an attacker-chosen host and receive the credential (server-side request forgery + token disclosure). The pre-httpx `urllib` implementation was worse: it forwarded every header, including `Authorization`, across cross-host redirects.\n\n### Impact\nAny plugin that authenticates to a host with a non-standard auth header and follows that host\u0027s redirects can be coerced into sending the credential, and an authenticated request, to another host the monitoring server can reach. The concrete case is the Redfish checks (`X-Auth-Token`), but the flaw is in the shared `fetch()` and affects every consumer.\n\n### Patches\nFixed in linuxfabrik-lib 6.0.0 (commit 6573ff9). On a cross-origin redirect (any scheme/host/port change other than a plain same-host HTTP-to-HTTPS upgrade) `fetch()` now keeps only benign transport headers and drops every other caller-supplied header, so credentials never follow a redirect to a different origin.",
  "id": "GHSA-4jc5-g844-4x33",
  "modified": "2026-07-30T14:46:13Z",
  "published": "2026-07-30T14:46:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-4jc5-g844-4x33"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67435"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/lib/commit/6573ff9347e541200305d278d2663d2e54e052ff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect"
}

PYSEC-2026-3578

Vulnerability from pysec - Published: 2026-08-04 11:34 - Updated: 2026-08-04 13:36

Details

Summary

Impact

Patches

Severity

6.0 (Medium)


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

Impacted products

Name	purl
linuxfabrik-lib	pkg:pypi/linuxfabrik-lib

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "linuxfabrik-lib",
        "purl": "pkg:pypi/linuxfabrik-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0.0",
        "2.0.0.7",
        "2.1.0.0",
        "2.1.0.4",
        "2.1.1.15",
        "2.1.1.5",
        "2.1.1.7",
        "2.2.0",
        "2.2.1",
        "2.3.0",
        "2.4.0",
        "3.0.0",
        "3.1.0",
        "3.1.1",
        "3.2.0",
        "3.3.0",
        "3.4.0",
        "3.4.1",
        "4.0.0",
        "4.0.1",
        "4.0.2",
        "4.1.0",
        "4.2.0",
        "4.3.0",
        "4.4.0",
        "5.0.0",
        "5.1.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-67435",
    "GHSA-4jc5-g844-4x33"
  ],
  "details": "### Summary\n`lib.url.fetch()` follows HTTP redirects (`follow_redirects=True`). httpx strips only `Authorization` and `Cookie` when a redirect crosses the origin, so any other caller-supplied credential header (a session token such as Redfish\u0027s `X-Auth-Token`, an API key, ...) was still sent to the redirect target. A malicious or redirect-capable server can therefore answer an authenticated request with a `3xx` to an attacker-chosen host and receive the credential (server-side request forgery + token disclosure). The pre-httpx `urllib` implementation was worse: it forwarded every header, including `Authorization`, across cross-host redirects.\n\n### Impact\nAny plugin that authenticates to a host with a non-standard auth header and follows that host\u0027s redirects can be coerced into sending the credential, and an authenticated request, to another host the monitoring server can reach. The concrete case is the Redfish checks (`X-Auth-Token`), but the flaw is in the shared `fetch()` and affects every consumer.\n\n### Patches\nFixed in linuxfabrik-lib 6.0.0 (commit 6573ff9). On a cross-origin redirect (any scheme/host/port change other than a plain same-host HTTP-to-HTTPS upgrade) `fetch()` now keeps only benign transport headers and drops every other caller-supplied header, so credentials never follow a redirect to a different origin.",
  "id": "PYSEC-2026-3578",
  "modified": "2026-08-04T13:36:21.672106Z",
  "published": "2026-08-04T11:34:45.223750Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-4jc5-g844-4x33"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67435"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/lib/commit/6573ff9347e541200305d278d2663d2e54e052ff"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Linuxfabrik/monitoring-plugins"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/linuxfabrik-lib"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-4jc5-g844-4x33"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-67435 (GCVE-0-2026-67435)

FKIE_CVE-2026-67435

GHSA-4JC5-G844-4X33

Summary

Impact

Patches

PYSEC-2026-3578

Summary

Impact

Patches

Tags

Sightings

Nomenclature

Related by attack behaviour