CVE-2026-59937

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 73% 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, nvd
Trending — 4 sources updated this week
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.

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
26.6%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Possible long runtimes for repeated malformed cross-reference entries · Advisory · py-pdf/pypdf · GitHub

https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
github_release Patch Available

Version 6.14.0, 2026-06-22

Patch available: py-pdf/pypdf 6.14.0

https://github.com/py-pdf/pypdf/releases/tag/6.14.0
github_pr Patch Available

SEC: Speed up recovery when reading broken cross-reference table

Patch available: py-pdf/pypdf 6.14.0 (PR #3887 merged 2026-06-22)

https://github.com/py-pdf/pypdf/pull/3887
github_commit Patch Available

commit b5fc5aa714f4 (py-pdf/pypdf)

Patch available: py-pdf/pypdf 6.14.0 (contains commit b5fc5aa714f4)

https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 20× 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. 2026-07-14 15:09 UTCEG score recompute
  2. 2026-07-14 02:26 UTCEG score recompute
  3. 2026-07-13 22:31 UTCEPSS rescore
  4. 2026-07-13 13:42 UTCEG score recompute
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-13 00:58 UTCEG score recompute
  8. 2026-07-12 12:15 UTCEG score recompute
  9. 2026-07-12 05:46 UTCEPSS rescore
  10. 2026-07-11 23:29 UTCEG score recompute
  11. 2026-07-11 10:46 UTCEG score recompute
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-10 22:03 UTCEG score recompute▲ 0.60
  15. 2026-07-09 21:46 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  16. 2026-07-09 19:46 UTCEG score recompute
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-08 17:29 UTCEG score recompute
  20. 2026-07-08 17:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-59937?
CVE-2026-59937 is a high vulnerability published on July 8, 2026. pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
When was CVE-2026-59937 disclosed?
CVE-2026-59937 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59937 actively exploited?
CVE-2026-59937 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59937?
CVE-2026-59937 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59937?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59937, 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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