{"items":[{"id":"NVI-00010757","kind":"vulnerability","title":"Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-654x-cwwv-5j9c","CVE-2026-114501"],"plain_summary":"GitHub lists this reviewed advisory for Pillow. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1b1c8a89cff79a56091f716d4a334f90"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.370%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.30936. Missing scores are unknown.","source_id":"sr-1b1c8a89cff79a56091f716d4a334f90"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-eddb3174ed73bf5bc3a59e4f7a0de5b3","url":"https://github.com/advisories/GHSA-654x-cwwv-5j9c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-654x-cwwv-5j9c","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"},{"id":"sr-1b1c8a89cff79a56091f716d4a334f90","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-114501","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.776Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-eddb3174ed73bf5bc3a59e4f7a0de5b3"],"technology":"Pillow","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen `PILLOW_ALIGNMENT` is set above 1, exporting an image to Arrow returns uninitialized heap memory mixed in with the pixel data. That memory can include pixels from images the process freed earlier. \n\n### Details\n\nWith an alignment above 1, the default allocator pads each row up to `aligned_linesize` and starts the first row at an aligned offset into the block. It then exports `im->blocks[0].ptr` as `xsize * ysize` tightly packed pixels, so exported data includes the padding bytes, and can include a few bytes from before the first row.\n\nTested vulnerable on 11.2.1, 12.3.0, 4c1ed27a5.\n\n### PoC\n\nWhether things leak may depend on allocator configuration. This does show a leak on my Mac.\n\n```python\nimport os\n\nos.environ[\"PILLOW_ALIGNMENT\"] = \"64\"\n\nfrom PIL import Image\n\n# Image A: 64 px wide, so its rows fill the whole aligned stride\na = Image.new(\"L\", (64, 40), 0x41).transpose(Image.Transpose.FLIP_LEFT_RIGHT)\ndel a\n\n# Image B: 61 px wide, so each row has 3 bytes of padding; its pixels are all 0\nb = Image.new(\"L\", (61, 40), 0).transpose(Image.Transpose.FLIP_LEFT_RIGHT)\n\ntry:\n    expor","public_affected_ranges":[">= 11.2.1, < 13.0.0"]}],"null_published_at":"2026-11-07T14:01:55.394Z","source_updated_at":"2026-10-23T21:53:25.000Z","source_disclosed_at":"2026-10-23T21:53:21.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T22:07:08.657Z"},{"id":"NVI-00010757","kind":"vulnerability","title":"Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-654x-cwwv-5j9c","CVE-2026-114501"],"plain_summary":"GitHub lists this reviewed advisory for Pillow. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-eddb3174ed73bf5bc3a59e4f7a0de5b3"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-eddb3174ed73bf5bc3a59e4f7a0de5b3","url":"https://github.com/advisories/GHSA-654x-cwwv-5j9c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-654x-cwwv-5j9c","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:08.657Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-eddb3174ed73bf5bc3a59e4f7a0de5b3"],"technology":"Pillow","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen `PILLOW_ALIGNMENT` is set above 1, exporting an image to Arrow returns uninitialized heap memory mixed in with the pixel data. That memory can include pixels from images the process freed earlier. \n\n### Details\n\nWith an alignment above 1, the default allocator pads each row up to `aligned_linesize` and starts the first row at an aligned offset into the block. It then exports `im->blocks[0].ptr` as `xsize * ysize` tightly packed pixels, so exported data includes the padding bytes, and can include a few bytes from before the first row.\n\nTested vulnerable on 11.2.1, 12.3.0, 4c1ed27a5.\n\n### PoC\n\nWhether things leak may depend on allocator configuration. This does show a leak on my Mac.\n\n```python\nimport os\n\nos.environ[\"PILLOW_ALIGNMENT\"] = \"64\"\n\nfrom PIL import Image\n\n# Image A: 64 px wide, so its rows fill the whole aligned stride\na = Image.new(\"L\", (64, 40), 0x41).transpose(Image.Transpose.FLIP_LEFT_RIGHT)\ndel a\n\n# Image B: 61 px wide, so each row has 3 bytes of padding; its pixels are all 0\nb = Image.new(\"L\", (61, 40), 0).transpose(Image.Transpose.FLIP_LEFT_RIGHT)\n\ntry:\n    expor","public_affected_ranges":[">= 11.2.1, < 13.0.0"]}],"null_published_at":"2026-10-31T22:27:12.380Z","source_updated_at":"2026-10-23T21:53:25.000Z","source_disclosed_at":"2026-10-23T21:53:21.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T22:07:08.657Z"}],"next_cursor":null,"snapshot_revision":"42594"}