CVE-2026-50553

HIGHPre-NVD 8.68.6
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
8.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.6Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Note Mark is an open-source note-taking application. Prior to version 0.19.5, Note Mark validates book and note slug values with the OpenAPI/huma tag pattern:"[a-z0-9-]+". huma compiles this with regexp.MustCompile(s.Pattern) and tests it with patternRe.MatchString(str), an UNANCHORED match. Because the pattern is not anchored (^...$), any string that merely CONTAINS one [a-z0-9-] substring passes validation. A slug such as ../../../../../../tmp/escape is accepted and stored verbatim. The data-export CLI commands (note-mark migrate export and note-mark migrate export-v1) join these unsanitized slugs straight into the output path with path.Join / filepath.Join, then os.MkdirAll the directory and os.Create the note file. path.Join resolves the ../ segments, so the note content file is written OUTSIDE the configured export directory. The export process commonly runs as root (default in Docker / bare-metal admin usage), so this is a root-privilege arbitrary directory create + file write. This issue has been patched in version 0.19.5.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
55
EG Risk 55/100

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 (value × EchelonGraph’s weight)
Severity86% × 45%
The EG Score, 8.6 of 10.
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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

July 9, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Sep 4, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

V0.19.5

Patch available: enchant97/note-mark v0.19.5

https://github.com/enchant97/note-mark/releases/tag/v0.19.5
GitHub commit Patch Available

commit 67b7de04308a (enchant97/note-mark)

Patch available: enchant97/note-mark v0.19.5 (contains commit 67b7de04308a)

https://github.com/enchant97/note-mark/commit/67b7de04308a858ef27ceff87b514067b6d667e5
GitHub advisoryMentions a patch (unverified)

Path traversal via unsanitized book/note slug in migrate export (sibling of GHSA-g49p) · Advisory · enchant97/note-mark · GitHub

https://github.com/enchant97/note-mark/security/advisories/GHSA-rqrh-8wpv-x7hh

Vendor Advisories for CVE-2026-50553(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/enchant97/note-mark/backend—
  • every version up to 0.0.0-20260601210719-67b7de04308a: fixed in 0.0.0-20260601210719-67b7de04308a
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 32× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  3. 2026-10-12 15:59 UTCEG score recompute
  4. 2026-10-11 19:42 UTCEG score recompute
  5. 2026-10-11 16:57 UTCEG score recompute
  6. 2026-10-11 14:20 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-10-01 16:03 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-09-28 10:55 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  24. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  25. 2026-09-24 11:40 UTCEG score recompute
Show 27 more
  1. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-09-23 05:59 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-09-18 05:37 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-09-13 23:46 UTCEG score recompute
  9. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-09-12 16:41 UTCEG score recompute
  11. 2026-09-12 03:25 UTCEG score recompute
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-09-09 22:57 UTCEG score recompute
  15. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-09-06 14:00 UTCEG score recompute
  18. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-09-05 22:36 UTCEG score recompute
  20. 2026-09-04 18:42 UTCEG score recompute
  21. 2026-09-04 17:55 UTCEG score recompute
  22. 2026-09-04 17:29 UTCEG score recomputeFirst assessed: 8.6 HIGH
  23. 2026-09-04 17:29 UTCMITRE cvelistV5CVSS v3 → 8.6 · CVSS v4 → 8.6
  24. 2026-08-01 09:12 UTCEG score recompute
  25. 2026-07-26 12:20 UTCEG score recompute
  26. 2026-07-23 03:18 UTCEG score recompute
  27. 2026-07-09 13:45 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-50553?
CVE-2026-50553 is a high-severity vulnerability; its CVE record was published on July 9, 2026. Note Mark is an open-source note-taking application. Prior to version 0.19.5, Note Mark validates book and note slug values with the OpenAPI/huma tag pattern:"[a-z0-9-]+". huma compiles this with regexp.MustCompile(s.Pattern) and tests it with patternRe.MatchString(str), an UNANCHORED match.…
When was the CVE record for CVE-2026-50553 published?
The CVE record for CVE-2026-50553 was published on July 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-50553 actively exploited?
CVE-2026-50553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50553?
CVE-2026-50553 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-50553?
A fix for CVE-2026-50553 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50553 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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