CVE-2023-6507

MEDIUMNVD 4.96.1▲
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2023-12-08. NVD baseline CVSS 4.9; sources differ by 1.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.9Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was found in CPython 3.12.0 subprocess module on POSIX platforms. The issue was fixed in CPython 3.12.1 and does not affect other stable releases.

When using the extra_groups= parameter with an empty list as a value (ie extra_groups=[]) the logic regressed to not call setgroups(0, NULL) before calling exec(), thus not dropping the original processes' groups before starting the new process. There is no issue when the parameter isn't used or when any value is used besides an empty list.

This issue only impacts CPython processes run with sufficient privilege to make the setgroups system call (typically root).

CVSS v3
4.9
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
68%
KEV
Not listed

Published

December 8, 2023

Last Modified

July 31, 2026

Advisory Details (5)

Auto-updated Jul 31, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 85bbfa8a4bbd (python/cpython)

Fix landed in python/cpython commit 85bbfa8a4bbd — awaiting tagged release

https://github.com/python/cpython/commit/85bbfa8a4bbdbb61a3a84fbd7cb29a4096ab8a06
github_commit

commit 10e9bb13b8dc (python/cpython)

Fix landed in python/cpython commit 10e9bb13b8dc — awaiting tagged release

https://github.com/python/cpython/commit/10e9bb13b8dcaa414645b9bd10718d8f7179e82b
github_commit

commit 9fe7655c6ce0 (python/cpython)

Fix landed in python/cpython commit 9fe7655c6ce0 — awaiting tagged release

https://github.com/python/cpython/commit/9fe7655c6ce0b8e9adc229daf681b6d30e6b1610
generic

Mailman 3 [CVE-2023-6507] Groups not dropped before running subprocess when using empty 'extra_groups' parameter - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/AUL7QFHBLILGISS7U63B47AYSSGJJQZD/
generic

subprocess.Popen: Performance regression on Linux since 124af17b6e [CVE-2023-6507] · Issue #112334 · python/cpython · GitHub

https://github.com/python/cpython/issues/112334

Vendor Advisories for CVE-2023-6507(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3.8-venv (3.8.0-3ubuntu1~18.04.2+esm2) @ bionic2026-05-24ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 46× 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.

Showing the most recent 100 of 121 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
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  10. 2026-07-31 15:27 UTCVendor advisory
  11. 2026-07-31 15:27 UTCGHSA enrichment
  12. 2026-07-31 14:51 UTCEG score recompute
  13. 2026-07-31 14:51 UTCVendor advisory
  14. 2026-07-31 14:51 UTCGHSA enrichment
  15. 2026-07-30 16:26 UTCEPSS rescore
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  23. 2026-07-23 02:30 UTCEG score recompute
  24. 2026-07-22 23:17 UTCEG score recompute
  25. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-22 14:07 UTCEPSS rescore
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  25. 2026-07-06 16:26 UTCEPSS rescore
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  37. 2026-06-27 02:37 UTCOSV refresh
  38. 2026-06-25 13:48 UTCEPSS rescore
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  40. 2026-06-24 14:04 UTCEPSS rescore
  41. 2026-06-24 14:04 UTCEPSS rescore
  42. 2026-06-24 06:33 UTCNVD updateCVSS v3 → 4.9
  43. 2026-06-23 21:31 UTCEPSS rescore
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  45. 2026-06-22 14:24 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-6507?
CVE-2023-6507 is a medium vulnerability published on December 8, 2023. An issue was found in CPython 3.12.0 subprocess module on POSIX platforms. The issue was fixed in CPython 3.12.1 and does not affect other stable releases. When using the extragroups= parameter with an empty list as a value (ie extragroups=[]) the logic regressed to not call setgroups(0, NULL)…
When was CVE-2023-6507 disclosed?
CVE-2023-6507 was first published in the National Vulnerability Database on December 8, 2023, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-6507 actively exploited?
CVE-2023-6507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 31.7% of all scored CVEs.
What is the CVSS score of CVE-2023-6507?
CVE-2023-6507 has a CVSS v3 base score of 4.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.1.
How do I remediate CVE-2023-6507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6507, 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.

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