# Libxls vulnerabilities

Source: https://junglewise.ai/threats/vendors/libxls  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/libxls.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in Libxls: 0 in the last 7 days and 2 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-79592, was published on 10 September 2026. Nothing was published in the last eight weeks. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 2
- All time: 4 (0 critical, 0 exploited in the wild)

## About Libxls

The developer and maintainer of the libxls C library.

## Latest Libxls vulnerabilities

- [CVE-2026-79592: libxls out-of-bounds read in xls_dumpSummary](https://junglewise.ai/threats/cve-2026-79592-libxls-out-of-bounds-read-in-xls-dumpsummary) (high, CVSS 7.5, published 10 Sep 2026)
- [CVE-2026-79591: libxls heap-buffer-overflow and use-after-free in xls_getCSS](https://junglewise.ai/threats/cve-2026-79591-libxls-heap-buffer-overflow-and-use-after-free-in-xls-getcss) (high, CVSS 7.8, published 10 Sep 2026)
- [CVE-2026-26825: libxls use-of-uninitialized memory in xls_parseWorkBook](https://junglewise.ai/threats/cve-2026-26825-libxls-use-of-uninitialized-memory-in-xls-parseworkbook) (info, published 3 Jun 2026)
- [CVE-2026-26824: libxls use of uninitialized memory in OLE container parser](https://junglewise.ai/threats/cve-2026-26824-libxls-use-of-uninitialized-memory-in-ole-container-parser) (info, CVSS 0, published 3 Jun 2026)

## Most severe Libxls vulnerabilities

- [CVE-2026-79591: libxls heap-buffer-overflow and use-after-free in xls_getCSS](https://junglewise.ai/threats/cve-2026-79591-libxls-heap-buffer-overflow-and-use-after-free-in-xls-getcss) (high, CVSS 7.8, published 10 Sep 2026)
- [CVE-2026-79592: libxls out-of-bounds read in xls_dumpSummary](https://junglewise.ai/threats/cve-2026-79592-libxls-out-of-bounds-read-in-xls-dumpsummary) (high, CVSS 7.5, published 10 Sep 2026)
- [CVE-2026-26824: libxls use of uninitialized memory in OLE container parser](https://junglewise.ai/threats/cve-2026-26824-libxls-use-of-uninitialized-memory-in-ole-container-parser) (info, CVSS 0, published 3 Jun 2026)
- [CVE-2026-26825: libxls use-of-uninitialized memory in xls_parseWorkBook](https://junglewise.ai/threats/cve-2026-26825-libxls-use-of-uninitialized-memory-in-xls-parseworkbook) (info, published 3 Jun 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 2 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Libxls technologies

- [Libxls](https://junglewise.ai/threats/technologies/libxls): 4 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Libxls vulnerabilities", https://junglewise.ai/threats/vendors/libxls, 9 November 2026.