CVE-2026-11972

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 62% 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 — 4 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

A fix is available — apply it.

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

June 23, 2026

Last Modified

August 13, 2026

Advisory Details (3)

Auto-updated Jun 24, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Mailman 3 [CVE-2026-11972] tarfile opened in streaming mode mishandles EOF - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/
github_pr

gh-151981: Make tarfile._Stream.seek break at EOF

Fix merged in python/cpython PR #151982 on 2026-06-23 — awaiting tagged release

https://github.com/python/cpython/pull/151982
generic

tarfile._Stream.seek ignores EOF · Issue #151981 · python/cpython · GitHub

https://github.com/python/cpython/issues/151981

Vendor Advisories for CVE-2026-11972(8)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpython3-13-main-3.13.15-1.hum12026-08-13redhat
redhatpython3-14-main-3.14.7-1.hum12026-08-13redhat
redhatpython3-14-main-3.14.6-1.2.hum12026-07-05redhat
redhatpython3-11-main-3.11.15-4.4.hum12026-07-05redhat
redhatpython3-13-main-3.13.14-1.2.hum12026-07-05redhat
redhatpython3-12-main-3.12.13-3.3.hum12026-07-05redhat

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.

Affected Packages

(14 across 8 ecosystems)
Debian:11(3)
PackageVulnerable rangeFixed inDependents
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)——
python2.72.7.18-10 ... 2.7.18-9 (10 versions)——
python3.93.9.10-1 ... 3.9.9-4 (29 versions)——
Debian:14(3)
PackageVulnerable rangeFixed inDependents
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-1 (11 versions)——
python3.133.13.11-1 ... 3.13.9-1 (8 versions)3.13.15-1—
python3.143.14.0-1 ... 3.14.6-1 (24 versions)3.14.7-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
pypy37.3.11+dfsg-2 ... 7.3.23+dfsg-1 (29 versions)——
python3.113.11.2-6 ... 3.11.9-1 (28 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
pypy37.3.19+dfsg-2 ... 7.3.23+dfsg-1 (11 versions)——
python3.133.13.11-1 ... 3.13.9-1 (13 versions)——
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
python3—3.12.14-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
python3—3.12.14-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
python3—3.12.14-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
python3—3.14.7-r0—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 57× 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 316 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 10:20 UTCEG score recompute
  3. 2026-09-18 10:20 UTCVendor advisory
  4. 2026-09-18 10:20 UTCGHSA enrichment
  5. 2026-09-16 05:14 UTCEPSS rescore
  6. 2026-09-14 02:04 UTCEG score recompute
  7. 2026-09-14 02:04 UTCVendor advisory
  8. 2026-09-14 02:04 UTCGHSA enrichment
  9. 2026-09-13 16:46 UTCEPSS rescore
  10. 2026-09-13 12:20 UTCEG score recompute
  11. 2026-09-13 12:20 UTCVendor advisory
  12. 2026-09-13 12:20 UTCGHSA enrichment
  13. 2026-09-12 15:00 UTCEPSS rescore
  14. 2026-09-11 14:52 UTCEPSS rescore
  15. 2026-09-11 09:36 UTCEPSS rescore
  16. 2026-09-10 09:34 UTCEPSS rescore
  17. 2026-09-08 22:00 UTCEPSS rescore
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-04 05:06 UTCEPSS rescore
  21. 2026-09-02 14:11 UTCEPSS rescore
  22. 2026-09-01 13:53 UTCEPSS rescore
  23. 2026-09-01 04:39 UTCEPSS rescore
  24. 2026-08-30 20:24 UTCEG score recompute
  25. 2026-08-30 20:24 UTCVendor advisory
Show 75 more
  1. 2026-08-30 20:24 UTCGHSA enrichment
  2. 2026-08-30 19:17 UTCEPSS rescore
  3. 2026-08-30 01:21 UTCEPSS rescore
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-27 14:24 UTCEPSS rescore
  6. 2026-08-25 13:48 UTCEPSS rescore
  7. 2026-08-24 22:05 UTCEG score recompute
  8. 2026-08-24 22:05 UTCVendor advisory
  9. 2026-08-24 22:05 UTCGHSA enrichment
  10. 2026-08-24 04:43 UTCVendor advisory
  11. 2026-08-24 04:43 UTCGHSA enrichment
  12. 2026-08-23 14:09 UTCVendor advisory
  13. 2026-08-23 14:09 UTCGHSA enrichment
  14. 2026-08-23 02:06 UTCEG score recompute
  15. 2026-08-23 02:06 UTCVendor advisory
  16. 2026-08-23 02:06 UTCGHSA enrichment
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-22 13:43 UTCEG score recompute
  19. 2026-08-22 13:43 UTCVendor advisory
  20. 2026-08-22 13:43 UTCGHSA enrichment
  21. 2026-08-21 23:48 UTCEPSS rescore
  22. 2026-08-21 19:48 UTCVendor advisory
  23. 2026-08-21 19:48 UTCGHSA enrichment
  24. 2026-08-21 07:47 UTCEG score recompute
  25. 2026-08-21 07:47 UTCVendor advisory
  26. 2026-08-21 07:47 UTCGHSA enrichment
  27. 2026-08-20 22:55 UTCEPSS rescore
  28. 2026-08-20 19:46 UTCVendor advisory
  29. 2026-08-20 19:46 UTCGHSA enrichment
  30. 2026-08-20 07:45 UTCEG score recompute
  31. 2026-08-20 07:45 UTCVendor advisory
  32. 2026-08-20 07:45 UTCGHSA enrichment
  33. 2026-08-19 17:03 UTCEPSS rescore
  34. 2026-08-19 04:47 UTCEG score recompute
  35. 2026-08-19 04:47 UTCVendor advisory
  36. 2026-08-19 04:47 UTCGHSA enrichment
  37. 2026-08-18 13:48 UTCEPSS rescore
  38. 2026-08-17 13:39 UTCVendor advisory
  39. 2026-08-17 13:39 UTCGHSA enrichment
  40. 2026-08-17 01:38 UTCEG score recompute
  41. 2026-08-17 01:38 UTCVendor advisory
  42. 2026-08-17 01:38 UTCGHSA enrichment
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-16 13:37 UTCEG score recompute
  45. 2026-08-16 13:37 UTCVendor advisory
  46. 2026-08-16 13:37 UTCGHSA enrichment
  47. 2026-08-16 02:14 UTCEPSS rescore
  48. 2026-08-16 01:28 UTCVendor advisory
  49. 2026-08-16 01:28 UTCGHSA enrichment
  50. 2026-08-15 13:27 UTCEG score recompute
  51. 2026-08-15 13:27 UTCVendor advisory
  52. 2026-08-15 13:27 UTCGHSA enrichment
  53. 2026-08-15 01:30 UTCEPSS rescore
  54. 2026-08-15 01:26 UTCVendor advisory
  55. 2026-08-15 01:26 UTCGHSA enrichment
  56. 2026-08-14 13:26 UTCVendor advisory
  57. 2026-08-14 13:26 UTCGHSA enrichment
  58. 2026-08-14 01:25 UTCEG score recompute
  59. 2026-08-14 01:25 UTCVendor advisory
  60. 2026-08-14 01:25 UTCGHSA enrichment
  61. 2026-08-13 22:00 UTCEPSS rescore
  62. 2026-08-13 13:24 UTCVendor advisory
  63. 2026-08-13 13:24 UTCGHSA enrichment
  64. 2026-08-13 01:23 UTCEG score recompute
  65. 2026-08-13 01:23 UTCVendor advisory
  66. 2026-08-13 01:23 UTCGHSA enrichment
  67. 2026-08-13 00:41 UTCEG score recompute
  68. 2026-08-13 00:41 UTCVendor advisory
  69. 2026-08-13 00:41 UTCGHSA enrichment
  70. 2026-08-12 13:50 UTCEPSS rescore
  71. 2026-08-12 13:35 UTCVendor advisory
  72. 2026-08-12 13:35 UTCGHSA enrichment
  73. 2026-08-12 01:34 UTCEG score recompute
  74. 2026-08-12 01:34 UTCVendor advisory
  75. 2026-08-12 01:34 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-11972?
CVE-2026-11972 is a high vulnerability published on June 23, 2026. When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.
When was CVE-2026-11972 disclosed?
CVE-2026-11972 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11972 actively exploited?
CVE-2026-11972 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 61.9% of all scored CVEs.
What is the CVSS score of CVE-2026-11972?
CVE-2026-11972 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-11972?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11972, 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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