CVE-2026-14266

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.8Exploit: Elevated riskExposed: 0

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

7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

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
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Jul 29, 2026
No patch confirmed yet.
generic

ZDI-26-444 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-26-444/

Vendor Advisories for CVE-2026-14266(1)

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

Affected Packages

(6 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
7zip22.01+dfsg-10~exp1 ... 22.01+really26.01+dfsg-0+deb12u1 (6 versions)22.01+really26.02+dfsg-0+deb12u1—
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb12u1, 16.02+really26.01+dfsg-0+deb12u116.02+really26.02+dfsg-0+deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
7zip24.09+dfsg-8 ... 26.02+dfsg-2 (23 versions)——
p7zip—16.02+transitional.1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
p7zip16.02+dfsg-8, 16.02+really25.01+dfsg-0+deb11u1, 16.02+really26.01+dfsg-0+deb11u116.02+really26.02+dfsg-0+deb11u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
7zip24.09+dfsg-8 ... 26.01+dfsg-3 (21 versions)26.02+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 108× 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 122 total refreshes for this CVE.

  1. 2026-08-30 01:21 UTCEPSS rescore
  2. 2026-08-29 23:17 UTCEG score recompute
  3. 2026-08-29 23:17 UTCGHSA enrichment
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-27 23:22 UTCEG score recompute
  6. 2026-08-27 23:22 UTCGHSA enrichment
  7. 2026-08-27 14:24 UTCEPSS rescore
  8. 2026-08-27 10:28 UTCGHSA enrichment
  9. 2026-08-26 21:34 UTCEG score recompute
  10. 2026-08-26 21:34 UTCGHSA enrichment
  11. 2026-08-26 08:39 UTCGHSA enrichment
  12. 2026-08-25 19:40 UTCEG score recompute
  13. 2026-08-25 19:40 UTCGHSA enrichment
  14. 2026-08-25 13:48 UTCEPSS rescore
  15. 2026-08-25 06:47 UTCGHSA enrichment
  16. 2026-08-24 17:53 UTCEG score recompute
  17. 2026-08-24 17:53 UTCGHSA enrichment
  18. 2026-08-24 04:00 UTCGHSA enrichment
  19. 2026-08-23 15:06 UTCGHSA enrichment
  20. 2026-08-23 02:11 UTCEG score recompute
  21. 2026-08-23 02:11 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 13:16 UTCGHSA enrichment
  24. 2026-08-22 00:22 UTCEG score recompute
  25. 2026-08-22 00:22 UTCGHSA enrichment
Show 75 more
  1. 2026-08-21 23:48 UTCEPSS rescore
  2. 2026-08-21 11:28 UTCEG score recompute
  3. 2026-08-21 11:28 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 22:16 UTCGHSA enrichment
  6. 2026-08-20 09:22 UTCGHSA enrichment
  7. 2026-08-19 20:28 UTCEG score recompute
  8. 2026-08-19 20:28 UTCGHSA enrichment
  9. 2026-08-19 17:03 UTCEPSS rescore
  10. 2026-08-19 07:33 UTCGHSA enrichment
  11. 2026-08-18 18:35 UTCEG score recompute
  12. 2026-08-18 18:35 UTCGHSA enrichment
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-18 02:01 UTCGHSA enrichment
  15. 2026-08-17 13:05 UTCGHSA enrichment
  16. 2026-08-17 00:11 UTCEG score recompute
  17. 2026-08-17 00:11 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 11:16 UTCEG score recompute
  20. 2026-08-16 11:16 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 22:23 UTCGHSA enrichment
  23. 2026-08-15 09:29 UTCEG score recompute
  24. 2026-08-15 09:29 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-14 20:34 UTCGHSA enrichment
  27. 2026-08-14 07:40 UTCEG score recompute
  28. 2026-08-14 07:40 UTCGHSA enrichment
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-13 18:46 UTCGHSA enrichment
  31. 2026-08-13 05:53 UTCGHSA enrichment
  32. 2026-08-12 16:59 UTCEG score recompute
  33. 2026-08-12 16:59 UTCGHSA enrichment
  34. 2026-08-12 13:50 UTCEPSS rescore
  35. 2026-08-12 04:05 UTCGHSA enrichment
  36. 2026-08-11 15:10 UTCEG score recompute
  37. 2026-08-11 15:10 UTCGHSA enrichment
  38. 2026-08-11 13:42 UTCEPSS rescore
  39. 2026-08-11 02:16 UTCEG score recompute
  40. 2026-08-11 02:16 UTCGHSA enrichment
  41. 2026-08-10 23:59 UTCEPSS rescore
  42. 2026-08-10 13:23 UTCGHSA enrichment
  43. 2026-08-10 00:27 UTCEG score recompute
  44. 2026-08-10 00:27 UTCGHSA enrichment
  45. 2026-08-09 13:46 UTCEPSS rescore
  46. 2026-08-09 11:34 UTCGHSA enrichment
  47. 2026-08-08 22:39 UTCEG score recompute
  48. 2026-08-08 22:39 UTCGHSA enrichment
  49. 2026-08-08 16:37 UTCEPSS rescore
  50. 2026-08-08 09:45 UTCEG score recompute
  51. 2026-08-08 09:45 UTCGHSA enrichment
  52. 2026-08-07 20:51 UTCEG score recompute▲ 0.80
  53. 2026-08-07 20:51 UTCGHSA enrichment
  54. 2026-08-07 20:50 UTCNVD updateCVSS v3 → 7.8
  55. 2026-08-07 17:56 UTCEG score recompute
  56. 2026-08-07 17:56 UTCGHSA enrichment
  57. 2026-08-07 05:02 UTCGHSA enrichment
  58. 2026-08-06 16:08 UTCEG score recompute
  59. 2026-08-06 16:08 UTCGHSA enrichment
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-06 03:14 UTCEG score recompute
  62. 2026-08-06 03:14 UTCGHSA enrichment
  63. 2026-08-05 19:17 UTCEPSS rescore
  64. 2026-08-05 14:20 UTCGHSA enrichment
  65. 2026-08-05 01:25 UTCEG score recompute
  66. 2026-08-05 01:25 UTCGHSA enrichment
  67. 2026-08-04 15:09 UTCEPSS rescore
  68. 2026-08-04 12:31 UTCEG score recompute
  69. 2026-08-04 12:31 UTCGHSA enrichment
  70. 2026-08-04 10:38 UTCEPSS rescore
  71. 2026-08-03 21:52 UTCEG score recompute
  72. 2026-08-03 21:52 UTCGHSA enrichment
  73. 2026-08-03 10:35 UTCEPSS rescore
  74. 2026-08-03 08:58 UTCGHSA enrichment
  75. 2026-08-02 20:04 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCliyuxuan504-byte/CVE-2026-14266
    First seen Jul 25, 2026

    7-Zip XZ Decoder Heap Buffer Overflow - Full analysis, root cause, PoC, and RCE exploitation roadmap

    Open source ↗
  • GitHub PoC4minx/CVE-2026-14266
    First seen Jul 22, 2026

    CVE-2026-14266 - XZ Heap Buffer Overflow PoC Generator for 7-Zip

    Open source ↗

Frequently asked(5)

What is CVE-2026-14266?
CVE-2026-14266 is a high vulnerability published on July 29, 2026. 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page…
When was CVE-2026-14266 disclosed?
CVE-2026-14266 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14266 actively exploited?
CVE-2026-14266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.3% of all scored CVEs.
What is the CVSS score of CVE-2026-14266?
CVE-2026-14266 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-14266?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14266, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-14266

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