Vulnerability-Lookup

OPENSUSE-SU-2026:22128-1

Vulnerability from csaf_opensuse - Published: 2026-10-19 15:30 - Updated: 2026-11-10 16:04

Summary

Security update for libxls

Severity

Moderate

Notes

Title of the patch: Security update for libxls

Description of the patch: This update for libxls fixes the following issues: Changes in libxls: Update to release 1.6.4: * Fix use of uninitialized memory in OLE parsing [boo#1267687, CVE-2026-26825] * Fix use of uninitialized memory in read_MSAT [boo#1267608, CVE-2026-26824] * Fix use of uninitialized memory in xls_parseWorkBook * Fix out-of-bounds reads in the formula dumper * Handle allocation failures in OLE, workbook and string code * Read SummaryInformation streams at their real size * Keep full precision when converting numeric cells to strings * Fix "creation of UTF-8 locale failed" in xls2csv Update to release 1.6.3: * Fix style record size check on big-endian systems * Fix header include in C++ mode * Fix buffer overflows when parsing style records * Fix infinite loop with self-referencing sectors

Patchnames: openSUSE-Leap-16.0-packagehub-678

CVE-2026-26824

6.1 (Medium)


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

Affected products

Recommended 12 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:libxls-devel-0:1.6.4-bp160.1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-devel-0:1.6.4-bp160.1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-devel-0:1.6.4-bp160.1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-devel-0:1.6.4-bp160.1.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-tools-0:1.6.4-bp160.1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-tools-0:1.6.4-bp160.1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-tools-0:1.6.4-bp160.1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxls-tools-0:1.6.4-bp160.1.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxlsreader8-0:1.6.4-bp160.1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxlsreader8-0:1.6.4-bp160.1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxlsreader8-0:1.6.4-bp160.1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libxlsreader8-0:1.6.4-bp160.1.1.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2026-26825

5.3 (Medium)


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

Affected products

Recommended 12 products, the same list as for CVE-2026-26824

Threats

Impact moderate

References

10 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/2…	self
https://bugzilla.suse.com/1267608	self
https://bugzilla.suse.com/1267687	self
https://www.suse.com/security/cve/CVE-2026-26824/	self
https://www.suse.com/security/cve/CVE-2026-26825/	self
https://www.suse.com/security/cve/CVE-2026-26824	external
https://bugzilla.suse.com/1267608	external
https://www.suse.com/security/cve/CVE-2026-26825	external
https://bugzilla.suse.com/1267687	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-26824",
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          "text": "https://www.suse.com/security/cve/CVE-2026-26824"
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      "notes": [
        {
          "category": "general",
          "text": "libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file",
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CVE-2026-26824 (GCVE-0-2026-26824)

Vulnerability from cvelistv5 – Published: 2026-06-03 00:00 – Updated: 2026-09-23 15:47

Summary

libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file

Severity

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 12:24 UTC

CWE

n/a
CWE-457 - Use of Uninitialized Variable

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2159 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/libxls/libxls/issues/155
https://github.com/libxls/libxls/commit/9adebc9b6…
https://github.com/libxls/libxls/issues/153

Show details on NVD website

JSON

To clipboard

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              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
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CVE-2026-26825 (GCVE-0-2026-26825)

Vulnerability from cvelistv5 – Published: 2026-06-03 00:00 – Updated: 2026-09-23 15:48

Summary

A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-08 16:41 UTC

CWE

n/a
CWE-908 - Use of Uninitialized Resource

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2159 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/libxls/libxls/issues/156
https://github.com/libxls/libxls/issues/153
https://github.com/libxls/libxls/commit/9adf88f4e…

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OPENSUSE-SU-2026:22128-1

CVE-2026-26824 (GCVE-0-2026-26824)

CVE-2026-26825 (GCVE-0-2026-26825)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour