CVE-2026-91818

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-23. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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

A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s JavaScript handling of PDF annotations. Reentrant page-event processing during annotation enumeration may release the associated page object, which is subsequently accessed, resulting in an application crash.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
35
EG Risk 35/100CISA SSVC

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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic

Security Bulletins | Foxit

https://www.foxit.com/support/security-bulletins.html

Vendor Advisories for CVE-2026-91818(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 49× 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. 2026-10-04 14:16 UTCGHSA enrichment
  2. 2026-10-04 01:56 UTCEG score recompute
  3. 2026-10-04 01:56 UTCGHSA enrichment
  4. 2026-10-03 13:44 UTCGHSA enrichment
  5. 2026-10-03 01:30 UTCEG score recompute
  6. 2026-10-03 01:30 UTCGHSA enrichment
  7. 2026-10-02 13:19 UTCGHSA enrichment
  8. 2026-10-02 01:07 UTCEG score recompute
  9. 2026-10-02 01:07 UTCGHSA enrichment
  10. 2026-10-01 19:51 UTCEPSS rescore
  11. 2026-10-01 12:52 UTCGHSA enrichment
  12. 2026-10-01 00:41 UTCEG score recompute
  13. 2026-10-01 00:41 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-30 12:29 UTCGHSA enrichment
  16. 2026-09-30 00:15 UTCEG score recompute
  17. 2026-09-30 00:15 UTCGHSA enrichment
  18. 2026-09-29 08:45 UTCEG score recompute
  19. 2026-09-29 08:45 UTCGHSA enrichment
  20. 2026-09-28 20:34 UTCEG score recompute
  21. 2026-09-28 20:34 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-28 08:22 UTCGHSA enrichment
  25. 2026-09-27 20:08 UTCEG score recompute
Show 24 more
  1. 2026-09-27 20:08 UTCGHSA enrichment
  2. 2026-09-27 13:49 UTCEPSS rescore
  3. 2026-09-27 07:56 UTCGHSA enrichment
  4. 2026-09-26 19:45 UTCEG score recompute
  5. 2026-09-26 19:45 UTCGHSA enrichment
  6. 2026-09-26 15:59 UTCEPSS rescore
  7. 2026-09-26 07:28 UTCEG score recompute
  8. 2026-09-26 07:28 UTCGHSA enrichment
  9. 2026-09-25 19:15 UTCGHSA enrichment
  10. 2026-09-25 06:35 UTCGHSA enrichment
  11. 2026-09-24 18:24 UTCEG score recompute
  12. 2026-09-24 18:24 UTCGHSA enrichment
  13. 2026-09-24 14:04 UTCEPSS rescore
  14. 2026-09-24 06:13 UTCGHSA enrichment
  15. 2026-09-23 18:01 UTCEG score recompute
  16. 2026-09-23 18:01 UTCGHSA enrichment
  17. 2026-09-23 17:54 UTCEPSS rescore
  18. 2026-09-23 15:19 UTCEG score recompute
  19. 2026-09-23 15:19 UTCGHSA enrichment
  20. 2026-09-23 14:25 UTCEG score recompute
  21. 2026-09-23 14:25 UTCGHSA enrichment
  22. 2026-09-23 08:23 UTCEG score recompute
  23. 2026-09-23 07:57 UTCEG score recompute
  24. 2026-09-23 07:56 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91818?
CVE-2026-91818 is a high vulnerability published on September 23, 2026. A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s JavaScript handling of PDF annotations. Reentrant page-event processing during annotation enumeration may release the associated page object, which is subsequently accessed, resulting in an application crash.
When was CVE-2026-91818 disclosed?
CVE-2026-91818 was first published on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91818 actively exploited?
CVE-2026-91818 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91818?
CVE-2026-91818 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-91818?
No fix for CVE-2026-91818 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-91818 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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