CVE-2026-53956

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Rattler is a library that provides common functionality used within the conda ecosystem. rattler_cache prior to version 0.9.0 and py-rattler prior to version 0.24.0 were vulnerable to package-cache path traversal when handling package metadata from conda channels. During cache materialization, the ratter_cache code used the package record build string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory. The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form. Users should upgrade to rattler_cache version 0.9.0 or py-rattler version 0.24.0 and avoid untrusted conda channels.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

July 9, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
Patch available. Sources: github.
github Patch Available

Package cache path traversal via conda package build string · Advisory · conda/rattler · GitHub

https://github.com/conda/rattler/security/advisories/GHSA-h672-p7h7-97v9

Vendor Advisories for CVE-2026-53956(1)

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

Affected Packages

(2 across 2 ecosystems)
crates.io(1)
PackageVulnerable rangeFixed inDependents
rattler_cache—0.9.0—
PyPI(1)
PackageVulnerable rangeFixed inDependents
py-rattler0.1.0 ... 0.9.1 (36 versions)0.24.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 13× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:26 UTCEG score recompute
  3. 2026-09-17 19:31 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-14 07:07 UTCEG score recompute
  7. 2026-09-13 16:47 UTCEPSS rescore
  8. 2026-09-13 08:16 UTCEG score recompute
  9. 2026-09-12 03:18 UTCEG score recompute
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-10 14:22 UTCEG score recompute
  12. 2026-09-10 14:00 UTCEG score recompute
  13. 2026-09-09 22:56 UTCEG score recompute
  14. 2026-07-31 07:13 UTCEG score recompute
  15. 2026-07-26 12:14 UTCEG score recompute
  16. 2026-07-23 03:19 UTCEG score recompute
  17. 2026-07-09 23:46 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53956?
CVE-2026-53956 is a medium vulnerability published on July 9, 2026. Rattler is a library that provides common functionality used within the conda ecosystem. rattlercache prior to version 0.9.0 and py-rattler prior to version 0.24.0 were vulnerable to package-cache path traversal when handling package metadata from conda channels. During cache materialization, the…
When was CVE-2026-53956 disclosed?
CVE-2026-53956 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53956 actively exploited?
CVE-2026-53956 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-2026-53956?
CVE-2026-53956 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-53956?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53956, 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-2026-53956

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