CVE Explorer

CVE-2026-21878

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:40f72ef870ddf35915ff00acbd2503398607fa9b5fc30c1c1db2f4e367d4ffb6

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"bacnet-stack","vendor":"bacnet-stack","versions":[{"status":"affected","version":"< 1.5.0.rc3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:2c8569d8ced1da8f2cc5314013d8e7f47f06613b2a3461c480a7ea78bb7306ca · sha256:363eff17c8d3877c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"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","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:2c8569d8ced1da8f2cc5314013d8e7f47f06613b2a3461c480a7ea78bb7306ca · sha256:363eff17c8d3877c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:2c8569d8ced1da8f2cc5314013d8e7f47f06613b2a3461c480a7ea78bb7306ca · sha256:363eff17c8d3877c… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/bacnet-stack/bacnet-stack/commit/c5dc00a77b4bc2550befa67a930b333e299c18f3","tags":["x_refsource_MISC"],"url":"https://github.com/bacnet-stack/bacnet-stack/commit/c5dc00a77b4bc2550befa67a930b333e299c18f3"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2c8569d8ced1da8f2cc5314013d8e7f47f06613b2a3461c480a7ea78bb7306ca · sha256:363eff17c8d3877c… · /containers/cna/references/1

{"name":"https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-p8rx-c26w-545j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-p8rx-c26w-545j"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2c8569d8ced1da8f2cc5314013d8e7f47f06613b2a3461c480a7ea78bb7306ca · sha256:363eff17c8d3877c… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer