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CVE-2026-107215

HIGH 7.5

Published 2026-10-07 · Last modified 2026-10-10

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.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 15th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Qax Os Excelize

Products Excelize

Weakness (CWE)

  • CWE-789: : Memory Allocation with Excessive Size Value

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • github.com/xuri/excelize/v2 Go

    pkg:golang/github.com/xuri/excelize/v2

    SEMVER range
    • Introduced version (included): 2.3.1
    • Fixed boundary (excluded): 2.11.1-0.20260912113515-5f636f9dcde5
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-x2q3-8cjh-766f/GHSA-x2q3-8cjh-766f.json"
  }
}
    GitHub Advisory Database · GHSA-x2q3-8cjh-766f · Updated 2026-10-19T21:41:17.838565606Z
  • github.com/360EntSecGroup-Skylar/excelize/v2 Go

    pkg:golang/github.com/360EntSecGroup-Skylar/excelize/v2

    SEMVER range
    • Introduced version (included): 2.3.1
    Additional upstream package constraints
    {
  "ecosystem": {
    "imports": [
      {
        "path": "github.com/360EntSecGroup-Skylar/excelize/v2",
        "symbols": [
          "Decrypt",
          "OpenFile",
          "OpenReader",
          "extractPart"
        ]
      }
    ]
  },
  "database": {
    "source": "https://vuln.go.dev/ID/GO-2026-6689.json"
  }
}
    Go Vulnerability Database · GO-2026-6689 · Updated 2026-10-19T21:31:52.826584494Z
  • github.com/xuri/excelize/v2 Go

    pkg:golang/github.com/xuri/excelize/v2

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 2.11.1-0.20260912113515-5f636f9dcde5
    Additional upstream package constraints
    {
  "ecosystem": {
    "imports": [
      {
        "path": "github.com/xuri/excelize/v2",
        "symbols": [
          "Decrypt",
          "OpenFile",
          "OpenReader",
          "extractPart"
        ]
      }
    ]
  },
  "database": {
    "source": "https://vuln.go.dev/ID/GO-2026-6689.json"
  }
}
    Go Vulnerability Database · GO-2026-6689 · Updated 2026-10-19T21:31:52.826584494Z

Known Affected Software Configurations

VendorProductVersion range
ExcelizeExcelize≥ 2.3.1 and ≤ 2.11.0

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Exploit-tagged references (not proof of a PoC)

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS