{"items":[{"id":"NVI-00010657","kind":"vulnerability","title":"Pillow: Quadratic GIF comment concatenation allows DoS in Image.open()","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-74r2-7ff9-mjj2","CVE-2026-112401"],"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-05d66e02ce30bc76a34ffa783043eecc"],"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":"2026-11-01T12:00:16.000Z","value":"0.649%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.51125. Missing scores are unknown.","source_id":"sr-05d66e02ce30bc76a34ffa783043eecc"}],"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-8da6ac63ce87de888a9fed126c6414c4","url":"https://github.com/advisories/GHSA-74r2-7ff9-mjj2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-74r2-7ff9-mjj2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:30.906Z"},{"id":"sr-05d66e02ce30bc76a34ffa783043eecc","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-2026-112401","publisher":"FIRST EPSS","observed_at":"2026-11-01T14:28:32.265Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-8da6ac63ce87de888a9fed126c6414c4"],"technology":"Pillow","known_exclusions":[],"conditions_summary":"```\n============================================================================\nQuadratic GIF comment concatenation allows DoS in Image.open()\nLocation: src/PIL/GifImagePlugin.py:266  in GifImageFile._seek()\nCommit:   a707c6b21c313880d0771e54965d142dd42358b6\n============================================================================\n```\n\nOpening a crafted GIF file with `Image.open()` takes time that grows with the square of the file's size, so anyone who can submit an image to a service that uses Pillow can keep one worker busy at full processor load for a long time with a small file. A 2 MB file takes about 5 seconds to open, a 4 MB file about 35 seconds, and an 8 MB file about 3 minutes. An ordinary GIF of the same size opens in well under a second. The cost is paid inside `Image.open()` itself, with default settings, before the application has seen the image's size or format.\n\nThe bug is in `GifImageFile._seek()` in `src/PIL/GifImagePlugin.py`, which builds `info[\"comment\"]` by appending to an immutable `bytes` object with no size limit. It appends once per 255-byte sub-block (`comment += block`, line 261) and once per comment extension (`info[\"comment\"] += b\"\\n\" + comment`, l","public_affected_ranges":[">= 5.4.0, < 13.0.0"]}],"null_published_at":"2026-11-02T20:21:07.804Z","source_updated_at":"2026-10-21T20:42:12.000Z","source_disclosed_at":"2026-10-21T20:42:11.000Z","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":"2026-10-31T22:07:30.906Z"},{"id":"NVI-00010657","kind":"vulnerability","title":"Pillow: Quadratic GIF comment concatenation allows DoS in Image.open()","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-74r2-7ff9-mjj2","CVE-2026-112401"],"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-8da6ac63ce87de888a9fed126c6414c4"],"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-8da6ac63ce87de888a9fed126c6414c4","url":"https://github.com/advisories/GHSA-74r2-7ff9-mjj2","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-74r2-7ff9-mjj2","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:30.906Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-8da6ac63ce87de888a9fed126c6414c4"],"technology":"Pillow","known_exclusions":[],"conditions_summary":"```\n============================================================================\nQuadratic GIF comment concatenation allows DoS in Image.open()\nLocation: src/PIL/GifImagePlugin.py:266  in GifImageFile._seek()\nCommit:   a707c6b21c313880d0771e54965d142dd42358b6\n============================================================================\n```\n\nOpening a crafted GIF file with `Image.open()` takes time that grows with the square of the file's size, so anyone who can submit an image to a service that uses Pillow can keep one worker busy at full processor load for a long time with a small file. A 2 MB file takes about 5 seconds to open, a 4 MB file about 35 seconds, and an 8 MB file about 3 minutes. An ordinary GIF of the same size opens in well under a second. The cost is paid inside `Image.open()` itself, with default settings, before the application has seen the image's size or format.\n\nThe bug is in `GifImageFile._seek()` in `src/PIL/GifImagePlugin.py`, which builds `info[\"comment\"]` by appending to an immutable `bytes` object with no size limit. It appends once per 255-byte sub-block (`comment += block`, line 261) and once per comment extension (`info[\"comment\"] += b\"\\n\" + comment`, l","public_affected_ranges":[">= 5.4.0, < 13.0.0"]}],"null_published_at":"2026-10-31T22:27:09.627Z","source_updated_at":"2026-10-21T20:42:12.000Z","source_disclosed_at":"2026-10-21T20:42:11.000Z","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":"2026-10-31T22:07:30.906Z"}],"next_cursor":null,"snapshot_revision":"42594"}