CVE-2026-79592

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

An out-of-bounds read vulnerability exists in the xls_dumpSummary() function of libxls 1.6.3 due to insufficient validation of file-controlled OLE summary offsets.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
65
EG Risk 65/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 10, 2026

Last Modified

September 22, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

[Bug]out-of-bounds read / SEGV in xls_dumpSummary() from unchecked file-controlled OLE summary offsets (CWE-125) · Issue #162 · libxls/libxls · GitHub

https://github.com/libxls/libxls/issues/162
github_pr

Validate offsets in summary property sets

Fix merged in libxls/libxls PR #165 on 2026-08-21 — awaiting tagged release

https://github.com/libxls/libxls/pull/165/changes/6eed8bc1d51d6649faebab0184b21ab8768d8fa6

Vendor Advisories for CVE-2026-79592(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
r-cran-readxl1.4.2-1 ... 1.5.0.1-1 (6 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
r-cran-readxl1.4.5-1, 1.5.0-1, 1.5.0.1-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
r-cran-readxl1.4.5-1, 1.5.0-1, 1.5.0.1-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 101× 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.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-10-05 10:05 UTCEG score recompute
  2. 2026-10-05 10:05 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 22:50 UTCGHSA enrichment
  5. 2026-10-04 11:36 UTCGHSA enrichment
  6. 2026-10-04 00:20 UTCEG score recompute
  7. 2026-10-04 00:20 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 12:10 UTCGHSA enrichment
  10. 2026-10-03 00:11 UTCEG score recompute
  11. 2026-10-03 00:11 UTCGHSA enrichment
  12. 2026-10-02 17:57 UTCEPSS rescore
  13. 2026-10-02 12:36 UTCGHSA enrichment
  14. 2026-10-02 00:23 UTCEG score recompute
  15. 2026-10-02 00:23 UTCGHSA enrichment
  16. 2026-10-01 19:50 UTCEPSS rescore
  17. 2026-10-01 12:35 UTCGHSA enrichment
  18. 2026-10-01 01:20 UTCEG score recompute
  19. 2026-10-01 01:20 UTCGHSA enrichment
  20. 2026-09-30 14:03 UTCGHSA enrichment
  21. 2026-09-30 02:00 UTCEG score recompute
  22. 2026-09-30 02:00 UTCGHSA enrichment
  23. 2026-09-29 15:24 UTCEPSS rescore
  24. 2026-09-29 11:08 UTCGHSA enrichment
  25. 2026-09-28 23:53 UTCEG score recompute
Show 75 more
  1. 2026-09-28 23:53 UTCGHSA enrichment
  2. 2026-09-28 12:35 UTCGHSA enrichment
  3. 2026-09-28 01:20 UTCGHSA enrichment
  4. 2026-09-27 14:06 UTCEG score recompute
  5. 2026-09-27 14:05 UTCGHSA enrichment
  6. 2026-09-27 13:48 UTCEPSS rescore
  7. 2026-09-27 02:40 UTCEG score recompute
  8. 2026-09-27 02:40 UTCGHSA enrichment
  9. 2026-09-26 15:59 UTCEPSS rescore
  10. 2026-09-26 15:25 UTCGHSA enrichment
  11. 2026-09-26 04:10 UTCEG score recompute
  12. 2026-09-26 04:10 UTCGHSA enrichment
  13. 2026-09-26 00:28 UTCEPSS rescore
  14. 2026-09-25 16:48 UTCGHSA enrichment
  15. 2026-09-25 05:33 UTCGHSA enrichment
  16. 2026-09-24 18:18 UTCEG score recompute
  17. 2026-09-24 18:18 UTCGHSA enrichment
  18. 2026-09-24 14:04 UTCEPSS rescore
  19. 2026-09-24 06:50 UTCGHSA enrichment
  20. 2026-09-23 19:36 UTCEG score recompute
  21. 2026-09-23 19:36 UTCGHSA enrichment
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-23 07:31 UTCGHSA enrichment
  24. 2026-09-22 20:16 UTCEG score recompute
  25. 2026-09-22 20:16 UTCGHSA enrichment
  26. 2026-09-22 16:01 UTCEPSS rescore
  27. 2026-09-22 12:41 UTCGHSA enrichment
  28. 2026-09-22 01:26 UTCEG score recompute
  29. 2026-09-22 01:26 UTCGHSA enrichment
  30. 2026-09-21 21:09 UTCEPSS rescore
  31. 2026-09-21 14:12 UTCGHSA enrichment
  32. 2026-09-21 02:57 UTCEG score recompute
  33. 2026-09-21 02:57 UTCGHSA enrichment
  34. 2026-09-20 20:16 UTCEPSS rescore
  35. 2026-09-20 15:42 UTCGHSA enrichment
  36. 2026-09-20 04:27 UTCGHSA enrichment
  37. 2026-09-19 17:12 UTCEG score recompute
  38. 2026-09-19 17:12 UTCGHSA enrichment
  39. 2026-09-19 05:58 UTCEG score recompute
  40. 2026-09-19 05:58 UTCGHSA enrichment
  41. 2026-09-18 19:28 UTCEPSS rescore
  42. 2026-09-18 18:43 UTCGHSA enrichment
  43. 2026-09-18 07:28 UTCGHSA enrichment
  44. 2026-09-17 20:13 UTCEG score recompute
  45. 2026-09-17 20:13 UTCGHSA enrichment
  46. 2026-09-17 07:22 UTCGHSA enrichment
  47. 2026-09-16 20:08 UTCEG score recompute
  48. 2026-09-16 20:08 UTCGHSA enrichment
  49. 2026-09-16 14:08 UTCEPSS rescore
  50. 2026-09-16 08:54 UTCEG score recompute
  51. 2026-09-16 08:54 UTCGHSA enrichment
  52. 2026-09-16 05:15 UTCEPSS rescore
  53. 2026-09-15 20:50 UTCGHSA enrichment
  54. 2026-09-15 09:29 UTCEG score recompute
  55. 2026-09-15 09:29 UTCGHSA enrichment
  56. 2026-09-15 03:12 UTCEPSS rescore
  57. 2026-09-15 03:12 UTCEPSS rescore
  58. 2026-09-14 22:15 UTCGHSA enrichment
  59. 2026-09-14 10:58 UTCGHSA enrichment
  60. 2026-09-13 23:44 UTCEG score recompute
  61. 2026-09-13 23:44 UTCGHSA enrichment
  62. 2026-09-13 12:29 UTCGHSA enrichment
  63. 2026-09-13 01:15 UTCEG score recompute
  64. 2026-09-13 01:15 UTCGHSA enrichment
  65. 2026-09-12 14:00 UTCGHSA enrichment
  66. 2026-09-12 02:45 UTCEG score recompute
  67. 2026-09-12 02:45 UTCGHSA enrichment
  68. 2026-09-11 15:30 UTCGHSA enrichment
  69. 2026-09-11 15:04 UTCEG score recompute▲ 7.50
  70. 2026-09-11 15:04 UTCGHSA enrichment
  71. 2026-09-11 15:03 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  72. 2026-09-11 14:53 UTCEPSS rescore
  73. 2026-09-11 14:53 UTCEPSS rescore
  74. 2026-09-10 21:18 UTCNVD update
  75. 2026-09-10 20:40 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79592?
CVE-2026-79592 is a high vulnerability published on September 10, 2026. An out-of-bounds read vulnerability exists in the xls_dumpSummary() function of libxls 1.6.3 due to insufficient validation of file-controlled OLE summary offsets.
When was CVE-2026-79592 disclosed?
CVE-2026-79592 was first published on September 10, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79592 actively exploited?
CVE-2026-79592 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-79592?
CVE-2026-79592 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-79592?
An upstream fix for CVE-2026-79592 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-79592 are linked in the Vendor Advisories panel on this page.

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