FKIE_CVE-2026-21878

Vulnerability from fkie_nvd - Published: 2026-02-13 19:17 - Updated: 2026-02-18 18:49
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.
References
security-advisories@github.comhttps://github.com/bacnet-stack/bacnet-stack/commit/c5dc00a77b4bc2550befa67a930b333e299c18f3Patch
security-advisories@github.comhttps://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-p8rx-c26w-545jVendor Advisory, Exploit
Impacted products
Vendor Product Version
bacnetstack bacnet_stack 1.5.0
bacnetstack bacnet_stack 1.5.0
To clipboard 

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  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "matchCriteriaId": "2B47182E-6B7F-4C53-904A-EB37C9C0A439",
              "vulnerable": true
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack\u0027s file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3."
    }
  ],
  "id": "CVE-2026-21878",
  "lastModified": "2026-02-18T18:49:16.530",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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  "references": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-22"
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      "source": "security-advisories@github.com",
      "type": "Primary"
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}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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