CVE-2026-107215— Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS
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 是一个用于读取和写入 Microsoft Excel 电子表格的 Go 语言库。在版本 2.3.1 至 2.11.0 中， 函数在验证扇区链（sector chain）或大小域之前，直接根据攻击者可控制的 CFB（复合文件格式）目录项大小分配了一个字节切片。此外， 在未对数据流进行验证的情况下，就信任 CFB 目录项中的 字段，用于分配 和 所需的内存。 当构造恶意 OLE 复合文件时，若其中声明的 或 数据流大小为负数或异常巨大，该声明的大小会传入底层内存分配函数（如 ），导致以负长度进行分配，
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-107215
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Excelize: extractPart allocates attacker-controlled, unbounded and negative-sized buffers from CFB directory entries: remote panic / OOM DoS
Source: CVE Program / CVE List V5
Vulnerability Description
Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.3.1 to 2.11.0, extractPart allocates a byte slice directly from an attacker-controlled CFB directory-entry size before validating the sector chain or size domain. extractPart trusts the CFB directory entry streamSize for EncryptionInfo and EncryptedPackage allocations before validating the stream. When a crafted OLE compound file declares a negative or extremely large EncryptionInfo or EncryptedPackage stream size, the declared size reaches make with a negative length or forces a multi-gigabyte allocation, allowing an attacker to panic or exhaust process memory. 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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-107215
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-107215
请登录查看更多情报信息。
Other References for CVE-2026-107215 (3)
-
https://github.com/qax-os/excelize/pull/2396 x_refsource_MISC
-
https://github.com/qax-os/excelize/security/advisories/GHSA-x2q3-8cjh-766f x_refsource_CONFIRM
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-2026-107217 | 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 |
| CVE-2026-107218 | 5.3 MEDIUM | Excelize: RIGHT() on supplementary-plane text slices with a negative index and panics |
IV. Related Vulnerabilities
Same product: excelize
-
CVE-2026-107225
Excelize: GetStyle panics on a negative fillId, borderId or -
CVE-2026-107224
Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/ -
CVE-2026-107223
Excelize: Unbounded <col max> attribute is loaded with no Ma -
CVE-2026-107222
Excelize: GetConditionalFormats indexes conditional-formatti -
CVE-2026-107221
Excelize: a row whose earlier cell has a higher column refer
Same vendor: qax-os
-
CVE-2026-107225
Excelize: GetStyle panics on a negative fillId, borderId or -
CVE-2026-107224
Excelize: A Zip64 uncompressed-size of 2^63 panics OpenFile/ -
CVE-2026-107223
Excelize: Unbounded <col max> attribute is loaded with no Ma -
CVE-2026-107222
Excelize: GetConditionalFormats indexes conditional-formatti -
CVE-2026-107221
Excelize: a row whose earlier cell has a higher column refer
Same weakness: CWE-789
-
CVE-2026-107223
Excelize: Unbounded <col max> attribute is loaded with no Ma -
CVE-2026-106453
yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unv -
CVE-2026-106452
yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidate -
CVE-2026-103005
Memory Allocation with Excessive Size Value in Elasticsearch -
CVE-2026-106114
ImageSharp: ICC CLUT parsing allocates from unvalidated chan
V. Comments for CVE-2026-107215
No comments yet