CVE-2026-48156

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% 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: cna:github_m, epss
Trending — 3 sources updated this week
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.1Exploit: None knownExposed: 0

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

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.

CVSS v3
5.1
EG Score
5.1(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 28, 2026

Last Modified

May 30, 2026

Advisory Details (3)

Auto-updated Jun 16, 2026
Patch available. Sources: github_release, github, github_pr.
github_release Patch Available

Version 6.12.0, 2026-05-21

Patch available: py-pdf/pypdf 6.12.0

https://github.com/py-pdf/pypdf/releases/tag/6.12.0
github_pr Patch Available

SEC: Disallow cross-reference streams with zero-only width values

Patch available: py-pdf/pypdf 6.12.0 (PR #3791 merged 2026-05-21)

https://github.com/py-pdf/pypdf/pull/3791
github Patch Available

Possible long runtimes for zero-only width values in cross-reference streams · Advisory · py-pdf/pypdf · GitHub

https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6

Vendor Advisories for CVE-2026-48156(1)

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

Affected Packages

(6 across 5 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
pypdf3.17.4-1 ... 6.9.2-2 (14 versions)——
pypdf22.12.1-3, 2.12.1-3+deb12u1, 2.12.1-4——
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pypdf21.26.0-4 ... 2.9.0-1 (24 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pypdf5.4.0-1, 6.9.0-1, 6.9.2-1, 6.9.2-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pypdf5.4.0-1, 6.9.0-1, 6.9.2-1, 6.9.2-2——
PyPI(1)
PackageVulnerable rangeFixed inDependents
pypdf1.0 ... 6.9.2 (102 versions)6.12.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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 137 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-48156?
CVE-2026-48156 is a medium vulnerability published on May 28, 2026. pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
When was CVE-2026-48156 disclosed?
CVE-2026-48156 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on May 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48156 actively exploited?
CVE-2026-48156 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 97.6% of all scored CVEs.
What is the CVSS score of CVE-2026-48156?
CVE-2026-48156 has a CVSS v4.0 base score of 5.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-48156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48156, 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-2026-48156

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