CVE-2026-8356

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack. In fixed versions the unused second pass is no longer read into those tables.

CVSS v3
5.4
EG Score
5.4(medium)
EPSS
2.1%
KEV
Not listed

Published

June 15, 2026

Last Modified

June 15, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

Security advisories — LibreOffice

https://www.libreoffice.org/about-us/security/advisories/cve-2026-8356

Vendor Advisories for CVE-2026-8356(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 61× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 00:23 UTCEG score recompute
  2. 2026-07-07 00:23 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-05 21:35 UTCEG score recompute
  6. 2026-07-05 21:35 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 20:32 UTCEG score recompute
  10. 2026-07-04 20:32 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 19:29 UTCEG score recompute
  14. 2026-07-03 19:29 UTCGHSA enrichment
  15. 2026-07-02 18:27 UTCEG score recompute
  16. 2026-07-02 18:27 UTCGHSA enrichment
  17. 2026-07-01 17:23 UTCEG score recompute
  18. 2026-07-01 17:23 UTCGHSA enrichment
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-30 16:16 UTCEG score recompute
  21. 2026-06-30 16:16 UTCGHSA enrichment
  22. 2026-06-29 15:11 UTCEG score recompute
  23. 2026-06-29 15:11 UTCGHSA enrichment
  24. 2026-06-29 14:06 UTCEPSS rescore
  25. 2026-06-28 14:06 UTCEG score recompute
Show 36 more
  1. 2026-06-28 14:06 UTCGHSA enrichment
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-27 13:02 UTCEG score recompute
  4. 2026-06-27 13:02 UTCGHSA enrichment
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-26 11:58 UTCEG score recompute
  7. 2026-06-26 11:58 UTCGHSA enrichment
  8. 2026-06-25 13:50 UTCEPSS rescore
  9. 2026-06-25 04:59 UTCEG score recompute
  10. 2026-06-25 04:59 UTCGHSA enrichment
  11. 2026-06-24 14:05 UTCEPSS rescore
  12. 2026-06-24 03:48 UTCEG score recompute
  13. 2026-06-24 03:47 UTCGHSA enrichment
  14. 2026-06-23 21:33 UTCEPSS rescore
  15. 2026-06-23 02:44 UTCEG score recompute
  16. 2026-06-23 02:44 UTCGHSA enrichment
  17. 2026-06-22 14:25 UTCEPSS rescore
  18. 2026-06-22 01:32 UTCEG score recompute
  19. 2026-06-22 01:31 UTCGHSA enrichment
  20. 2026-06-21 14:56 UTCEPSS rescore
  21. 2026-06-21 01:59 UTCEPSS rescore
  22. 2026-06-20 23:28 UTCEG score recompute
  23. 2026-06-20 23:28 UTCGHSA enrichment
  24. 2026-06-19 22:10 UTCEG score recompute
  25. 2026-06-19 22:10 UTCGHSA enrichment
  26. 2026-06-19 19:26 UTCEPSS rescore
  27. 2026-06-18 21:06 UTCEG score recompute
  28. 2026-06-18 21:06 UTCGHSA enrichment
  29. 2026-06-17 20:00 UTCEG score recompute
  30. 2026-06-17 20:00 UTCGHSA enrichment
  31. 2026-06-17 17:53 UTCEPSS rescore
  32. 2026-06-16 18:57 UTCEG score recompute
  33. 2026-06-16 18:57 UTCGHSA enrichment
  34. 2026-06-16 17:53 UTCEPSS rescore
  35. 2026-06-15 17:54 UTCEG score recompute
  36. 2026-06-15 17:53 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8356?
CVE-2026-8356 is a medium vulnerability published on June 15, 2026. LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose…
When was CVE-2026-8356 disclosed?
CVE-2026-8356 was first published in the National Vulnerability Database on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8356 actively exploited?
CVE-2026-8356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8356?
CVE-2026-8356 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-8356?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8356, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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