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CVE-2026-107218— Excelize: RIGHT() on supplementary-plane text slices with a negative index and panics

Quick assessment

Affected
qax-os excelize
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Excelize 是一个用于读写 Microsoft Excel 电子表格的 Go 语言库。在版本 2.10.1 至 2.11.0 中，RIGHT 函数使用 UTF-16 代码单元（code-unit）数量来验证请求的长度，但在对字符（rune）数组进行切片时却使用了 Unicode 代码点（code-point）数量。RIGHT 函数通过 CalcCellValue 方法调用内部逻辑 leftRight，其中 countUTF16StringString 函数验证的是代码单元数量，而 utf8.RuneCount

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
qax-os excelize >= 2.10.1, <= 2.11.0 affected
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I. Basic Information for CVE-2026-107218

Vulnerability Information
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Vulnerability Title
Excelize: RIGHT() on supplementary-plane text slices with a negative index and panics
Source: CVE Program / CVE List V5
Vulnerability Description
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.10.1 to 2.11.0, RIGHT validates the requested length with UTF-16 code-unit counts but slices a rune array using Unicode code-point counts. RIGHT reaches leftRight through CalcCellValue, where countUTF16String validates one unit but utf8.RuneCountInString supplies the slice index in another. When RIGHT evaluates supplementary-plane text with a requested character count between the rune count and UTF-16 code-unit count, the inconsistent units produce a negative rune-slice index, allowing an attacker to panic during formula evaluation. No fixed version is available as of this review.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
qax-os excelize >= 2.10.1, <= 2.11.0 -

II. Public POCs for CVE-2026-107218

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III. Intelligence Information for CVE-2026-107218

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Other References for CVE-2026-107218 (3)

Same Patch Batch · qax-os · 2026-10-07 · 15 CVEs total

CVE-2026-107211 8.7 HIGH Excelize: Unchecked pivot-cache field index in extractPivotTableFields causes unrecoverabl
CVE-2026-107213 8.7 HIGH Excelize: Nil-pointer dereference in GetSlicers when a worksheet has extLst present but no
CVE-2026-107212 7.5 HIGH Excelize: Unbounded row number in Rows.Columns makes GetRows and the Rows iterator loop fo
CVE-2026-107214 7.5 HIGH Excelize Decrypt: unrecoverable panics on malformed OLE/CFB encrypted workbooks
CVE-2026-107216 7.5 HIGH Excelize ANCHORARRAY: mutually-referencing array formulas recurse unboundedly via re-entra
CVE-2026-107215 7.5 HIGH Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers
CVE-2026-107217 7.5 HIGH Excelize ColumnNameToNumber: int64 overflow yields an out-of-domain coordinate with nil er
CVE-2026-107219 7.5 HIGH Excelize: Unbounded spinCount in agile decryption burns CPU during OpenFile
CVE-2026-107223 7.1 HIGH Excelize: Unbounded <col max> attribute is loaded with no MaxColumns check and expanded pe
CVE-2026-107220 6.5 MEDIUM Excelize: Panic in cellInRange on a worksheet with an empty mergeCell ref
CVE-2026-107221 6.5 MEDIUM Excelize: a row whose earlier cell has a higher column reference than its last cell panics
CVE-2026-107222 6.5 MEDIUM Excelize: GetConditionalFormats indexes conditional-formatting rule sub-elements with no l
CVE-2026-107225 6.5 MEDIUM Excelize: GetStyle panics on a negative fillId, borderId or fontId in styles.xml
CVE-2026-107224 6.5 MEDIUM Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/OpenReader

IV. Related Vulnerabilities

Same product: excelize
Same vendor: qax-os
Same weakness: CWE-129

V. Comments for CVE-2026-107218

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