CVE-2026-57585

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
19.7%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jun 30, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Out-of-bounds read / crash on Unpacker reuse after a caught error · Advisory · msgpack/msgpack-python · GitHub

https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964
github_commit Patch Available

commit 2c56ddb5d002 (msgpack/msgpack-python)

Patch available: msgpack/msgpack-python v1.2.1 (contains commit 2c56ddb5d002)

https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
msgpack0.5.0 ... 1.2.0rc1 (32 versions)1.2.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 34× 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. 2026-07-10 17:45 UTCEG score recompute
  2. 2026-07-10 05:24 UTCEG score recompute
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-09 17:03 UTCEG score recompute
  6. 2026-07-09 04:41 UTCEG score recompute
  7. 2026-07-08 16:21 UTCEG score recompute
  8. 2026-07-08 03:59 UTCEG score recompute
  9. 2026-07-07 15:38 UTCEG score recompute
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-07 13:46 UTCEPSS rescore
  12. 2026-07-07 02:58 UTCEG score recompute
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 14:37 UTCEG score recompute
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-06 02:14 UTCEG score recompute
  19. 2026-07-05 13:52 UTCEG score recompute
  20. 2026-07-05 02:31 UTCEPSS rescore
  21. 2026-07-05 02:30 UTCEPSS rescore
  22. 2026-07-05 01:32 UTCEG score recompute
  23. 2026-07-04 13:09 UTCEG score recompute
  24. 2026-07-04 06:31 UTCEPSS rescore
  25. 2026-07-04 06:31 UTCEPSS rescore
Show 9 more
  1. 2026-07-04 00:49 UTCEG score recompute
  2. 2026-07-03 12:27 UTCEG score recompute
  3. 2026-07-03 00:00 UTCEG score recompute
  4. 2026-07-02 11:40 UTCEG score recompute
  5. 2026-07-01 23:16 UTCEG score recompute
  6. 2026-07-01 15:07 UTCEPSS rescore
  7. 2026-07-01 10:55 UTCEG score recompute
  8. 2026-06-30 22:34 UTCEG score recompute
  9. 2026-06-30 22:33 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57585?
CVE-2026-57585 is a high vulnerability published on June 30, 2026. MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This…
When was CVE-2026-57585 disclosed?
CVE-2026-57585 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57585 actively exploited?
CVE-2026-57585 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57585?
CVE-2026-57585 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-57585?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57585, 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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