CVE-2026-87910

MEDIUMPre-NVD 5.75.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% 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
5.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.7Exploit: None knownExposed: 0

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

When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.

CVSS v3
5.7
EG Score
5.7(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity57% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 16, 2026

Advisory Details (2)

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

tarfile hardlink fallback ignores custom extraction filter rejection via None · Issue #157265 · python/cpython · GitHub

https://github.com/python/cpython/issues/157265
github_pr

gh-157265: Honor None result of filter for link fallbacks

Fix merged in python/cpython PR #157266 on 2026-09-11 — awaiting tagged release

https://github.com/python/cpython/pull/157266

Vendor Advisories for CVE-2026-87910(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 19× in last 7d / 35× 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 17:26 UTCEG score recompute
  2. 2026-09-19 17:26 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:35 UTCGHSA enrichment
  5. 2026-09-17 19:42 UTCEG score recompute
  6. 2026-09-17 19:42 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-16 19:58 UTCGHSA enrichment
  9. 2026-09-16 19:40 UTCEG score recompute
  10. 2026-09-16 19:40 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 20:49 UTCEG score recompute
  14. 2026-09-15 20:49 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 21:53 UTCGHSA enrichment
  17. 2026-09-13 23:00 UTCEG score recompute
  18. 2026-09-13 23:00 UTCGHSA enrichment
  19. 2026-09-13 16:48 UTCEPSS rescore
  20. 2026-09-13 00:10 UTCEG score recompute
  21. 2026-09-13 00:10 UTCGHSA enrichment
  22. 2026-09-12 15:02 UTCEPSS rescore
  23. 2026-09-12 01:19 UTCEG score recompute
  24. 2026-09-12 01:19 UTCGHSA enrichment
  25. 2026-09-12 00:59 UTCEG score recompute
Show 10 more
  1. 2026-09-12 00:59 UTCGHSA enrichment
  2. 2026-09-11 21:22 UTCGHSA enrichment
  3. 2026-09-11 20:46 UTCEG score recompute
  4. 2026-09-11 20:46 UTCGHSA enrichment
  5. 2026-09-11 19:28 UTCEG score recompute
  6. 2026-09-11 19:28 UTCGHSA enrichment
  7. 2026-09-11 18:34 UTCEG score recompute
  8. 2026-09-11 18:34 UTCGHSA enrichment
  9. 2026-09-11 17:29 UTCEG score recompute
  10. 2026-09-11 17:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87910?
CVE-2026-87910 is a medium vulnerability published on September 11, 2026. When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was…
When was CVE-2026-87910 disclosed?
CVE-2026-87910 was first published in the National Vulnerability Database on September 11, 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-2026-87910 actively exploited?
CVE-2026-87910 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 63.7% of all scored CVEs.
What is the CVSS score of CVE-2026-87910?
CVE-2026-87910 has a CVSS v3 base score of 5.7 (NVD).
How do I remediate CVE-2026-87910?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87910, 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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