{"items":[{"id":"NVI-00011803","kind":"vulnerability","title":"ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-jj3q-cwqj-842r","CVE-2026-106117"],"plain_summary":"GitHub lists this reviewed advisory for ImageSharp, ImageSharp. 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-bbaabbbbaaa2d3eb80308ef619ac9c92"],"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":"CVSS","as_of":"2026-10-12T14:38:45.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-3224e009ec13282c16500c5136ab4727"},{"kind":"CVSS","as_of":"2026-10-27T20:11:46.843Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-0ec8e657598c3f9878b50cc369ca9454"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.385%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.32628. Missing scores are unknown.","source_id":"sr-bbaabbbbaaa2d3eb80308ef619ac9c92"}],"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-3224e009ec13282c16500c5136ab4727","url":"https://github.com/advisories/GHSA-jj3q-cwqj-842r","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jj3q-cwqj-842r","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"},{"id":"sr-0ec8e657598c3f9878b50cc369ca9454","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106117","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-106117","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:21.903Z"},{"id":"sr-bbaabbbbaaa2d3eb80308ef619ac9c92","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-2026-106117","publisher":"FIRST EPSS","observed_at":"2026-11-01T01:39:43.064Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 3.0.0, < 3.2.0"]},{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 4.0.0, < 4.1.1"]}],"null_published_at":"2026-11-08T08:10:32.018Z","source_updated_at":"2026-10-12T14:38:45.000Z","source_disclosed_at":"2026-10-07T16:18:50.000Z","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":"2026-10-31T23:14:22.124Z"},{"id":"NVI-00011803","kind":"vulnerability","title":"ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-jj3q-cwqj-842r","CVE-2026-106117"],"plain_summary":"GitHub lists this reviewed advisory for ImageSharp, ImageSharp. 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-0ec8e657598c3f9878b50cc369ca9454"],"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":"CVSS","as_of":"2026-10-12T14:38:45.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-3224e009ec13282c16500c5136ab4727"},{"kind":"CVSS","as_of":"2026-10-27T20:11:46.843Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-0ec8e657598c3f9878b50cc369ca9454"}],"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-3224e009ec13282c16500c5136ab4727","url":"https://github.com/advisories/GHSA-jj3q-cwqj-842r","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jj3q-cwqj-842r","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"},{"id":"sr-0ec8e657598c3f9878b50cc369ca9454","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106117","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-106117","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:58:21.903Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 3.0.0, < 3.2.0"]},{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 4.0.0, < 4.1.1"]}],"null_published_at":"2026-11-03T10:03:31.369Z","source_updated_at":"2026-10-12T14:38:45.000Z","source_disclosed_at":"2026-10-07T16:18:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T23:14:22.124Z"},{"id":"NVI-00011803","kind":"vulnerability","title":"ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-jj3q-cwqj-842r","CVE-2026-106117"],"plain_summary":"GitHub lists this reviewed advisory for ImageSharp, ImageSharp. 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-3224e009ec13282c16500c5136ab4727"],"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":"CVSS","as_of":"2026-10-12T14:38:45.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-3224e009ec13282c16500c5136ab4727"}],"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-3224e009ec13282c16500c5136ab4727","url":"https://github.com/advisories/GHSA-jj3q-cwqj-842r","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jj3q-cwqj-842r","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:14:22.124Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 3.0.0, < 3.2.0"]},{"certainty":"source_listed","source_ids":["sr-3224e009ec13282c16500c5136ab4727"],"technology":"ImageSharp","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen decoding a fax-compressed strip TIFF (Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman), the CCITT decompressors write decoded runs through `BitWriterUtils.WriteBits/WriteBit/WriteZeroBit`, which advance and write bits via `Unsafe.Add` with read-modify-write semantics — **without ever comparing the write position against the target buffer length**. The strip buffer is sized `ImageWidth × RowsPerStrip` (8 bytes in the PoC), but two independent defects let an attacker write tens of millions of bits past it: (a) T4 only increments `rowsWritten` when an EOL code is read, and one `ReadNextRun` accumulates unlimited makeup codes (+2560 px per 12-bit code) into a single `RunLength` that `WritePixelRun` then writes in one shot; (b) Modified Huffman writes **before** validating (`pixelsWritten > Width` is checked at :90-93, after the write at :56-63), so the overflow completes even though an exception is thrown later. One crafted ~90 KB file writes ~19.2 MB linearly past an 8-byte buffer and deterministically kills the process; the write offset and length are fully attacker-controlled (classic heap-corruption primitive on the managed heap).\n\nVerified at commi","public_affected_ranges":[">= 4.0.0, < 4.1.1"]}],"null_published_at":"2026-11-01T01:03:56.606Z","source_updated_at":"2026-10-12T14:38:45.000Z","source_disclosed_at":"2026-10-07T16:18:50.000Z","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":"2026-10-31T23:14:22.124Z"}],"next_cursor":null,"snapshot_revision":"42594"}