{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41503 exists.","fix":"No fix has been published for CVE-2026-41503 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-41503 is a high-severity memory corruption vulnerability in bacnet-stack, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-41503 and fix it if it is affected.\n\nWhat it is: CVE-2026-41503 is a high-severity memory corruption vulnerability in bacnet-stack, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41503 exists.\n\nAffected product: bacnet-stack. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-41503/ (Markdown: https://insights.sbomify.com/CVE-2026-41503/index.md)","id":"CVE-2026-41503","markdown":"https://insights.sbomify.com/CVE-2026-41503/index.md","name":"CVE-2026-41503","record":{"aliases":["GHSA-5w2v-mwqj-pr2c"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"BACnet protocol stack","requires_auth":"none","summary":"Unauthenticated remote attackers can cause crashes or read memory via out-of-bounds read in BACnet Stack's ReadPropertyMultiple decoder.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"bacnet_stack","vendor":"bacnetstack"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser","id":"CVE-2026-41503","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"OWASP Coraza WAF: Native audit-log format allows CRLF injection and log forgery via request body and header fields","id":"CVE-2026-41504"},"packages":[],"prev":{"headline":"BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder","id":"CVE-2026-41502"},"products":["bacnet-stack"],"published":"2026-04-24","related":[{"cvss_score":9.1,"headline":"Memory corruption in n/a","id":"CVE-2023-51773","kev_date_added":null,"published":"2023-12-25"},{"cvss_score":8.7,"headline":"BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple Decoder via Deprecated Tag Parser","id":"CVE-2026-41475","kev_date_added":null,"published":"2026-04-24"},{"cvss_score":8.7,"headline":"BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder","id":"CVE-2026-41502","kev_date_added":null,"published":"2026-04-24"},{"cvss_score":7.8,"headline":"BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash","id":"CVE-2026-26264","kev_date_added":null,"published":"2026-02-13"},{"cvss_score":7.5,"headline":"BACnet Stack Improperly Limits Pathnames to a Restricted Directory","id":"CVE-2026-21878","kev_date_added":null,"published":"2026-02-13"},{"cvss_score":7.5,"headline":"BACnet-stack MS/TP reply matcher OOB read","id":"CVE-2025-66624","kev_date_added":null,"published":"2025-12-05"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-27","vendors":["bacnet-stack"]},"summary":"Unauthenticated remote attackers can cause crashes or read memory via out-of-bounds read in BACnet Stack's ReadPropertyMultiple decoder.","url":"https://insights.sbomify.com/CVE-2026-41503/"}