{"schema":"threatline.record/2","record":{"id":"CVE-2026-112397","aliases":["GHSA-58r4-6rv3-gfh8"],"summary":"Pillow: Out-of-bounds access in _imagingmorph on a zero-width image","details":"### Summary\nA PPM or PGM file can declare a width of 0, which Pillow accepts, producing an image of size `(0, N)`. Passing that image to `ImageMorph.MorphOp.apply()` makes the native morphology code index a row buffer at `outrow[width - 1]`, which is `outrow[-1]` when the width is 0. The process crashes.\n\n### Details\nThe PPM parser reads width and height with no lower-bound check:\n\n- `src/PIL/PpmImagePlugin.py:119`\n\nThe native `apply()` writes the row edges with no guard that the width is positive:\n\n- `src/_imagingmorph.c:81` sets `outrow[0] = outrow[width - 1] = 0;`\n\n`match()` and `get_on_pixels()` use the same edge-indexing pattern.\n\n### PoC\n```python\nfrom PIL import Image, ImageMorph\n\n# A width-0 image (also producible from a crafted PPM header). apply() indexes\n# outrow[width - 1] == outrow[-1] in native code.\nim = Image.new(\"L\", (0, 5))\nImageMorph.MorphOp(op_name=\"dilation4\").apply(im)\n```\n\nRun it:\n```\n$ python 03_poc.py\nSegmentation fault (core dumped)\n```\n\nObserved on a source build of commit `3e2ab96`.\n\nUnder AddressSanitizer:\n```\n==ERROR: AddressSanitizer: SEGV on unknown address (pc ... in apply)\n    #0 apply   src/_imagingmorph.c:81\nSUMMARY: AddressSanitizer: SEGV src/_imagingmorph.c:81 in apply\n```\nWith width 0 the `outrow[width - 1]` write lands on an unmapped page, so it surfaces as a SEGV pinned to the edge-write line rather than a redzone overflow.\n\n### Impact\nOut-of-bounds write in a C extension. Affects any application that runs a morphology operation on an image opened from untrusted input. Result is a crash and possible memory corruption.","categories":["Libraries & packages"],"product":"Pillow","vendor":"python-pillow","ecosystem":"pip","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-58r4-6rv3-gfh8","source_modified_at":"2026-10-20T20:56:23Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"Pillow"},"range":"<= 12.3.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-112397","source_modified_at":"2026-10-19T21:38:18.176Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Pillow","vendor":"python-pillow","versions":[{"version":"< 13.0.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-58r4-6rv3-gfh8","source_modified_at":"2026-10-20T21:00:04.401258078Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"pillow","purl":"pkg:pypi/pillow"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"13.0.0"}],"type":"ECOSYSTEM"}],"versions":["1.0","1.1","1.2","1.3","1.4","1.5","1.6","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","10.0.0","10.0.1","10.1.0","10.2.0","10.3.0","10.4.0","11.0.0","11.1.0","11.2.1","11.3.0","12.0.0","12.1.0","12.1.1","12.2.0","12.3.0","2.0.0","2.1.0","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1","2.3.2","2.4.0","2.5.0","2.5.1","2.5.2","2.5.3","2.6.0","2.6.1","2.6.2","2.7.0","2.8.0","2.8.1"]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-58r4-6rv3-gfh8","source_modified_at":"2026-10-20T20:56:23Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"Pillow"},"version":"13.0.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-58r4-6rv3-gfh8","source_modified_at":"2026-10-20T21:00:04.401258078Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"PyPI","name":"pillow","purl":"pkg:pypi/pillow"},"version":"13.0.0"}],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00436,"percentile":0.36897,"score_date":"2026-10-23"},"published_at":"2026-10-19T21:17:35.684Z","modified_at":"2026-10-20T21:00:04.401258078Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-58r4-6rv3-gfh8","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-20T20:56:23Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-112397","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T21:38:18.176Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-58r4-6rv3-gfh8","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-20T21:00:04.401258078Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-112397","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8","tags":["exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112397","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/python-pillow/Pillow/commit/18f7c0dfee93063c51db6ed0ca8c4da2999dcb64","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-58r4-6rv3-gfh8","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-19T21:37:56.314774Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-20T21:00:04.401258078Z","content_hash":"a30efb511f28727f03effcd3fd4fb4fb3a7bd902b2306a756a684c993ae87b22"}}