A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).
CVE-2026-5525
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.2% (5th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 6.0 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-04-10) is not newer than that change (2026-10-26), so it does not.
Also known asEUVD-2026-21334 (ENISA EUVD) · GHSA-8hrp-2fqv-gvrx (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
- CVSS v3
- 7.8
- EG Score
- 7.8HIGHmedium confidence
- EG Risk
- 51EG Risk 51/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity78% × 45%Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release. - EPSS PROB
- 0.2%
- EPSS %ILE
- 5th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
April 10, 2026
Last Modified
October 26, 2026
Advisory Details (3)
Auto-updated Jun 10, 2026[BUG] Notepad++ 8.9.3 — Stack Buffer Overflow Vulnerabilities - DoS · Issue #17921 · notepad-plus-plus/notepad-plus-plus · GitHub
https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921Fix dropFiles crash on MAX_PATH-1 chars dirs
Upstream fix in progress (PR #17930 · notepad-plus-plus/notepad-plus-plus, state=closed)
https://github.com/notepad-plus-plus/notepad-plus-plus/pull/17930commit bfe7514d68bc (notepad-plus-plus/notepad-plus-plus)
Fix landed in notepad-plus-plus/notepad-plus-plus commit bfe7514d68bc — awaiting tagged release
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534c046c4ef2d1865267aa2b0Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 42× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 227 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 127 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
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- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
- 2026-10-26 21:32 UTCEG score recompute
- 2026-10-26 21:31 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 5th percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
- 2026-10-25 14:19 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-23 11:38 UTCEG score recompute
- 2026-10-23 11:37 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-18 03:30 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-17 03:24 UTCEG score recompute
- 2026-10-17 03:23 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
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- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
- 2026-10-12 15:55 UTCEG score recompute
- 2026-10-11 19:39 UTCEG score recompute
- 2026-10-11 16:54 UTCEG score recompute
- 2026-10-11 14:17 UTCEG score recompute
- 2026-10-10 20:53 UTCOSV refresh
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
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- 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-09-21 08:19 UTCOSV refresh
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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- 2026-09-02 06:44 UTCOSV refresh
- 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
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- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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- 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
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- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-16 07:04 UTCEG score recompute
- 2026-08-16 07:04 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-14 16:20 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-14 05:03 UTCEG score recompute
- 2026-08-14 05:03 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-13 09:21 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-12 19:16 UTCEG score recompute
- 2026-08-12 19:16 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-11 19:25 UTCEG score recompute
- 2026-08-11 19:25 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-11 02:57 UTCEG score recompute
- 2026-08-11 02:57 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-10 03:03 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-09 15:46 UTCEG score recompute
- 2026-08-09 15:46 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-09 04:29 UTCEG score recompute
- 2026-08-09 04:29 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 6th percentile
- 2026-08-08 01:37 UTCEG score recompute
- 2026-08-08 01:37 UTCGHSA enrichmentGHSA-8hrp-2fqv-gvrx · GitHub CVSS 6.0
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Frequently asked(5)
What is CVE-2026-5525?
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Dependency Blast Radius
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