CVE-2026-87818

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

GitPython 3.1.59 fails to restrict the --no-index option in the high-level diff API, allowing attackers to read arbitrary filesystem paths as repository operands. Attackers can combine --no-index with -I/--ignore-matching-lines to create a content-dependent Boolean oracle, repeatedly querying local files to recover single-line secrets through distinguishable success or error responses.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

GitPython 3.1.59 Local File Content Oracle via --no-index | Advisories | VulnCheck

https://www.vulncheck.com/advisories/gitpython-3.1.59-local-file-content-oracle-via-no-index
github Patch Available🟡 PoC Available

GitPython 3.1.59: --no-index bypasses diff unsafe-option protections and enables a blind local-file content oracle · Advisory · gitpython-developers/GitPython · GitHub

https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-whh4-5q6c-9v3x

Vendor Advisories for CVE-2026-87818(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
gitpython0.1.7 ... 3.1.9 (112 versions)3.1.60—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 33× 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. 2026-09-19 08:47 UTCEG score recompute
  2. 2026-09-19 08:47 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:00 UTCEG score recompute
  5. 2026-09-18 11:00 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 13:15 UTCGHSA enrichment
  8. 2026-09-16 15:30 UTCEG score recompute
  9. 2026-09-16 15:30 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-16 05:08 UTCGHSA enrichment
  13. 2026-09-15 07:22 UTCEG score recompute
  14. 2026-09-15 07:22 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 09:37 UTCEG score recompute
  17. 2026-09-14 09:37 UTCGHSA enrichment
  18. 2026-09-13 11:52 UTCEG score recompute
  19. 2026-09-13 11:52 UTCGHSA enrichment
  20. 2026-09-12 14:07 UTCGHSA enrichment
  21. 2026-09-11 16:22 UTCEG score recompute
  22. 2026-09-11 16:22 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 18:36 UTCGHSA enrichment
Show 8 more
  1. 2026-09-09 20:50 UTCGHSA enrichment
  2. 2026-09-09 15:29 UTCEG score recompute
  3. 2026-09-09 15:29 UTCGHSA enrichment
  4. 2026-09-09 14:20 UTCEG score recompute
  5. 2026-09-09 14:20 UTCGHSA enrichment
  6. 2026-09-09 12:25 UTCEG score recompute
  7. 2026-09-09 11:30 UTCEG score recompute
  8. 2026-09-09 11:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87818?
CVE-2026-87818 is a medium vulnerability published on September 9, 2026. GitPython 3.1.59 fails to restrict the --no-index option in the high-level diff API, allowing attackers to read arbitrary filesystem paths as repository operands. Attackers can combine --no-index with -I/--ignore-matching-lines to create a content-dependent Boolean oracle, repeatedly querying local…
When was CVE-2026-87818 disclosed?
CVE-2026-87818 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87818 actively exploited?
CVE-2026-87818 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.5% of all scored CVEs.
What is the CVSS score of CVE-2026-87818?
CVE-2026-87818 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-87818?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87818, 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-2026-87818

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