{"id":"GO-2026-6678","revision":null,"records":[{"revision":"877e565c2a9e4b9e95b54042352002da","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107223","aliases":[],"title":"Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process","description":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches flatCols, which expands xlsxCol.Min through xlsxCol.Max without enforcing MaxColumns. When a crafted worksheet supplies an oversized col max attribute and the application invokes a column mutator, flatCols performs a deep copy and append for every attacker-selected column number, allowing an attacker to consume excessive CPU and memory or trigger OOM. No fixed version is available as of this review.","state":0,"publishedAt":"2026-10-07T18:48:54.172+00:00","modifiedAt":"2026-10-07T22:05:27.449+00:00","affected":[{"ecosystem":"Vendor product","name":"excelize","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"qax-os\",\n                    \"product\": \"excelize\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.1.0, <= 2.11.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm","https://github.com/qax-os/excelize/pull/2370","https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107223","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107223","identifiers":["CVE-2026-107223"]},"retained":false,"historicalAffected":[]},{"revision":"a0b4f6927f7741f78c28e765d3d734f7","observedAt":"2026-11-09T05:07:29.781+00:00","statement":{"source":"euvd","id":"EUVD-2026-94554","aliases":["CVE-2026-107223","GHSA-fq3v-74gv-27gm"],"title":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches …","description":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches flatCols, which expands xlsxCol.Min through xlsxCol.Max without enforcing MaxColumns. When a crafted worksheet supplies an oversized col max attribute and the application invokes a column mutator, flatCols performs a deep copy and append for every attacker-selected column number, allowing an attacker to consume excessive CPU and memory or trigger OOM. No fixed version is available as of this review.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":7.1,"severity":null}],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm","https://github.com/qax-os/excelize/pull/2370","https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-94554","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 7, 2026, 6:48:54 PM","dateUpdated":"Oct 7, 2026, 10:05:27 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-94554","identifiers":["EUVD-2026-94554","CVE-2026-107223","GHSA-fq3v-74gv-27gm"]},"retained":false,"historicalAffected":[]},{"revision":"4a1f642647da43fb88d5ee8fc2b04697","observedAt":"2026-10-25T04:17:41.466+00:00","statement":{"source":"nvd","id":"CVE-2026-107223","aliases":[],"title":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches …","description":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, flatCols expands file-loaded column ranges without validating Min and Max against the worksheet column limit. SetColWidth reaches flatCols, which expands xlsxCol.Min through xlsxCol.Max without enforcing MaxColumns. When a crafted worksheet supplies an oversized col max attribute and the application invokes a column mutator, flatCols performs a deep copy and append for every attacker-selected column number, allowing an attacker to consume excessive CPU and memory or trigger OOM. No fixed version is available as of this review.","state":0,"publishedAt":"2026-10-07T19:17:34.97+00:00","modifiedAt":"2026-10-13T14:18:46.643+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":7.1,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7","https://github.com/qax-os/excelize/pull/2370","https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107223","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-789"],"productCriteria":["cpe:2.3:a:excelize:excelize:*:*:*:*:*:go:*:*"],"sourceDates":{"published":"2026-10-07T19:17:34.970","lastModified":"2026-10-13T14:18:46.643"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-107223","identifiers":["CVE-2026-107223"]},"retained":false,"historicalAffected":[]},{"revision":"d4068cc000f64f7ca0734be6e9e53eef","observedAt":"2026-11-05T23:38:32.248+00:00","statement":{"source":"osv","id":"GHSA-fq3v-74gv-27gm","aliases":["CVE-2026-107223","GO-2026-6678"],"title":"Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded per-column by flatCols(), so any column mutator hangs or OOMs the process","description":"### Summary\n\nThe `max` attribute of a `<col>` element in `xl/worksheets/sheetN.xml` is read verbatim on open with no check against `MaxColumns`, and `flatCols()` then walks `Min..Max` doing a `deepcopy.Copy` and `append` per iteration. Executed: `max=\"300000\"`, only about 18x past the real 16384 limit, cost 46.2 s of CPU and 122 MB on a single `SetColWidth` call, and the growth is linear in `max` up to 2^31-1.\n\nConfirmed at `ae2113b` (HEAD at the time of audit).\n\n### Details\n\n`col.go:547`, `flatCols()`, with the two loops at `:549` and `:564`:\n\n```go\nfor i := col.Min; i <= col.Max; i++ {\n...\nfor i := column.Min; i <= column.Max; i++ { ... fc = append(fc, deepcopy.Copy(...)) }\n```\n\n`column.Min` and `column.Max` are plain int attributes on `xmlWorksheet.go:279-280`, bound straight from the file. `MaxColumns` is 16384 (`templates.go:176`) and nothing in the parse path compares against it.\n\nThe contrast that makes this an oversight rather than a design decision is inside the callers themselves. `SetColWidth` validates its own column argument through `parseColRange`, which clamps to `MaxColumns`. But `flatCols` iterates `ws.Cols.Col`, the file-loaded slice, so the caller's validated argument never constrains the loop. The crafted column expands no matter which column the caller touches.\n\nThe row axis has the guard this axis is missing: GHSA-h69g-9hx6-f3v4 capped `checkSheet`'s row allocation at `TotalRows`, and GHSA-q5j5-6p94-4gwc capped streaming `Rows.Next`. There is no column-axis equivalent.\n\nPublic entry points that flatten the existing columns: `SetColWidth` (`col.go:498` into `:534`), `SetColStyle` (`col.go:431` into `:477`), `SetColVisible` (`col.go:282` into `:313`), `SetColOutlineLevel` (`col.go:376` into `:407`).\n\n### PoC\n\nExecuted in-package: crafted a real xlsx, rezipped with an injected `<cols>` block before `<sheetData>`, opened it with `OpenReader`, then called `SetColWidth`.\n\n```xml\n<cols><col min=\"1\" max=\"2147483647\" width=\"9\"/></cols>\n```\n\n```go\nf.SetColWidth(\"Sheet1\", \"A\", \"A\", 12)\n```\n\nMeasured:\n\n- `max=\"300000\"`: 46.2 s CPU, 122 MB allocated, `ws.Cols.Col` grew to 300000 entries, from one call.\n- `max=\"5000000\"`: did not complete in 110 s, killed by the test timeout.\n\nGrowth is linear in `max`. At `max=2147483647` that is roughly two billion `xlsxCol` allocations, which is hundreds of gigabytes and in practice a permanent hang ending in OOM.\n\n### Impact\n\nAny service that opens an untrusted spreadsheet and calls a column mutator. The input is a few dozen bytes of XML inside an otherwise ordinary workbook, no authentication is involved beyond whatever gates the upload, and the process is either wedged for minutes or killed by the OOM reaper. Availability only; no read or write primitive here.\n\n### Suggested fix\n\nValidate `col.Min` and `col.Max` against `MinColumns`/`MaxColumns` when parsing the `<col>` element, or at the top of `flatCols`, returning `ErrColumnNumber` for out-of-range values. That mirrors what `checkRowNum` already does on the row axis.\n\n### Why this is not GHSA-h69g-9hx6-f3v4 or GHSA-q5j5-6p94-4gwc\n\nBoth of those are row-axis allocation bounds, and both fixes cap at `TotalRows`. Neither touched `<col>` parsing or `flatCols`. This is the same weakness class on the column axis, and it is arguably worse than the two that were fixed, because those had a cap that was bypassed while this one has no cap at all.","state":0,"publishedAt":"2026-10-07T20:22:49+00:00","modifiedAt":"2026-11-05T23:26:15.089309+00:00","affected":[{"ecosystem":"Go","name":"github.com/xuri/excelize/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.1.0"},{"kind":"fixed","version":"2.11.1-0.20260807015645-a54c578af309"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm","https://github.com/qax-os/excelize/pull/2370","https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7","https://github.com/qax-os/excelize"],"sourceUrl":"https://github.com/advisories/GHSA-fq3v-74gv-27gm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-fq3v-74gv-27gm","identifiers":["GHSA-fq3v-74gv-27gm","CVE-2026-107223","GO-2026-6678"]},"retained":false,"historicalAffected":[]},{"revision":"5a1d2c3cc9f84f59bb3bcefa5d4e7ad2","observedAt":"2026-11-05T23:38:32.248+00:00","statement":{"source":"osv","id":"GO-2026-6678","aliases":["CVE-2026-107223","GHSA-fq3v-74gv-27gm"],"title":"Unbounded <col max> lacks MaxColumns check in flatCols(), causing column mutators to hang or OOM in github.com/xuri/excelize","description":"Unbounded <col max> lacks MaxColumns check in flatCols(), causing column mutators to hang or OOM in github.com/xuri/excelize","state":0,"publishedAt":"2026-11-05T22:53:46+00:00","modifiedAt":"2026-11-05T23:15:11.8796333+00:00","affected":[{"ecosystem":"Go","name":"github.com/360EntSecGroup-Skylar/excelize/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.1.0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/xuri/excelize/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.1-0.20260807015645-a54c578af309"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/qax-os/excelize/security/advisories/GHSA-fq3v-74gv-27gm","https://github.com/qax-os/excelize/commit/a54c578af309fa81f448143ed2b7a91192cc58a7","https://github.com/qax-os/excelize/pull/2370"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6678","license":"OSV · upstream source license applies","key":"osv:GO-2026-6678","identifiers":["GO-2026-6678","CVE-2026-107223","GHSA-fq3v-74gv-27gm"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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