CVE-2026-23879

HIGHPre-NVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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
8.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.0Exploit: NoneExposed: 0

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

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows symbolic links to be recreated outside the destination directory via crafted malicious symbolic link chains. When using extractall to extract an archive, the library restores these symbolic links, linking them to arbitrary directories on the host file system. During extraction, the program only checks the link arcname within the destination directory, but ignores the combined symlink path resolution. Attackers can exploit this vulnerability by constructing malicious archives, thereby bypassing the directory boundary restrictions implemented by the extractor. Subsequent extraction of regular files through these symbolic links can result in arbitrary file writes. This vulnerability may lead to remote code execution, privilege escalation, data corruption, or denial of service. This issue has been fixed in version 1.1.3.

CVSS v3
8.0
EG Score
8.0(medium)
EPSS
32.4%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 25, 2026

Advisory Details (2)

Auto-updated Jun 24, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

Arbitrary File Write Vulnerability in py7zr · Advisory · miurahr/py7zr · GitHub

https://github.com/miurahr/py7zr/security/advisories/GHSA-q6rc-2cgv-63h7
github_release Patch Available

Release version 1.1.3: Fix multiple vulnerabilities

Patch available: miurahr/py7zr v1.1.3

https://github.com/miurahr/py7zr/releases/tag/v1.1.3

Vendor Advisories for CVE-2026-23879(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
py7zr0.0.3 ... 1.1.2 (164 versions)1.1.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 56× 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. 2026-07-06 23:39 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:15 UTCEG score recompute
  5. 2026-07-06 02:23 UTCEPSS rescore
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  7. 2026-07-06 00:29 UTCEG score recompute
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  9. 2026-07-05 02:30 UTCEPSS rescore
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  12. 2026-07-04 06:31 UTCEPSS rescore
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  14. 2026-07-04 02:40 UTCEG score recompute
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  20. 2026-07-01 15:06 UTCEPSS rescore
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  22. 2026-07-01 05:52 UTCEG score recompute
  23. 2026-06-30 23:22 UTCEPSS rescore
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  25. 2026-06-30 18:27 UTCEG score recompute
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  1. 2026-06-30 07:03 UTCEG score recompute
  2. 2026-06-29 19:38 UTCEG score recompute
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 08:14 UTCEG score recompute
  5. 2026-06-28 20:50 UTCEG score recompute
  6. 2026-06-28 14:07 UTCEPSS rescore
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  8. 2026-06-28 09:25 UTCEG score recompute
  9. 2026-06-28 04:56 UTCEPSS rescore
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  11. 2026-06-27 21:59 UTCEG score recompute
  12. 2026-06-27 10:35 UTCEG score recompute
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-26 23:10 UTCEG score recompute
  15. 2026-06-26 11:46 UTCEG score recompute
  16. 2026-06-26 00:21 UTCEG score recompute
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-25 12:52 UTCEG score recompute
  20. 2026-06-25 01:27 UTCEG score recompute
  21. 2026-06-24 14:03 UTCEG score recompute
  22. 2026-06-24 02:38 UTCEG score recompute
  23. 2026-06-23 15:13 UTCEG score recompute
  24. 2026-06-23 03:46 UTCEG score recompute
  25. 2026-06-22 16:15 UTCEG score recompute
  26. 2026-06-22 04:50 UTCEG score recompute
  27. 2026-06-21 17:24 UTCEG score recompute
  28. 2026-06-21 05:56 UTCEG score recompute
  29. 2026-06-20 18:31 UTCEG score recompute
  30. 2026-06-20 07:01 UTCEG score recompute
  31. 2026-06-19 19:23 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-23879?
CVE-2026-23879 is a high vulnerability published on June 19, 2026. py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Versions 1.1.2 and below contain an an arbitrary file write vulnerability, which allows symbolic links to be recreated outside the destination directory via crafted malicious…
When was CVE-2026-23879 disclosed?
CVE-2026-23879 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23879 actively exploited?
CVE-2026-23879 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23879?
CVE-2026-23879 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2026-23879?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23879, 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

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