{"answers":{"affected":"3 open source packages ship an affected version, including uefi-firmware.","exploited":"There is no known exploitation of CVE-2026-54333 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-54333 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-54333 is a critical memory corruption vulnerability in theopolis uefi-firmware-parser, published on 14 Sep 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-2026-54333 and fix it if it is affected.\n\nWhat it is: CVE-2026-54333 is a critical memory corruption vulnerability in theopolis uefi-firmware-parser, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-54333 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- uefi-firmware (PyPI): affected all versions up to 1.12; no fix listed\n- uefi-firmware (PyPI): affected all versions up to 1.12; no fix listed\n- uefi-firmware (PyPI): affected all versions up to 1.12; no fix listed\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-2026-54333/ (Markdown: https://insights.sbomify.com/CVE-2026-54333/index.md)","id":"CVE-2026-54333","markdown":"https://insights.sbomify.com/CVE-2026-54333/index.md","name":"CVE-2026-54333","record":{"aliases":["GHSA-2689-5p89-6j3j","PYSEC-2026-3393"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"UEFI firmware parser","requires_auth":"none","summary":"A stack out-of-bounds write in the Tiano decompressor allows attackers to crash the parser or potentially execute code via crafted firmware images.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"UEFI Firmware Parser parses BIOS, Intel ME, and UEFI firmware structures including volumes, file systems, and files. Prior to 1.14, MakeTable() in uefi_firmware/compression/Tiano/Decompress.c does not validate that bit-length values read from a crafted Tiano or EFI compressed firmware bitstream remain within the expected range from 0 through 16. The normal CompressedSection.process() to efi_compressor.TianoDecompress() to TianoDecompress() to ReadPTLen() to MakeTable() parsing path can consequently write beyond the stack-allocated Count[17] array and related decode tables. The resulting stack corruption deterministically crashes the parsing process and may permit code execution depending on build and runtime details. This issue is fixed in version 1.14.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"UEFI Firmware Parser: Stack out-of-bounds write in tiano decompressor MakeTable","id":"CVE-2026-54333","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"UEFI Firmware Parser: Heap out-of-bounds write in tiano decompressor `ReadCLen`","id":"CVE-2026-54334"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.12"],"package":"uefi-firmware","purl":null,"source":"GHSA-2689-5p89-6j3j"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.12"],"package":"uefi-firmware","purl":"pkg:pypi/uefi-firmware","source":"GHSA-2689-5p89-6j3j"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.12"],"package":"uefi-firmware","purl":"pkg:pypi/uefi-firmware","source":"PYSEC-2026-3393"}],"prev":{"headline":"GoPacket's sFlow ExtendedGatewayFlow decoder: unbounded attacker-controlled allocation (104-byte UDP datagram -\u003e up to 16 GiB make) -\u003e unauthenticated remote DoS","id":"CVE-2026-54332"},"products":["uefi-firmware-parser"],"published":"2026-09-14","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-15","vendors":["theopolis"]},"summary":"A stack out-of-bounds write in the Tiano decompressor allows attackers to crash the parser or potentially execute code via crafted firmware images.","url":"https://insights.sbomify.com/CVE-2026-54333/"}