CVE-2026-18503

LOWPre-NVD 2.42.4—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 2.4 under a secondary CVSS source (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: epss, secondary
Trending — 3 sources updated this week
2.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 2.4Exploit: None knownExposed: 0

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

Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().

CVSS v3
2.4
EG Score
2.4(medium)
EG Risk
11(Track)
EG Risk 11/100SSVC: 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
Severity24% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 18, 2026

References (9)

Vendor Advisories for CVE-2026-18503(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 11× in last 7d / 29× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-18 15:33 UTCEG score recompute
  4. 2026-08-18 15:33 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 02:14 UTCEPSS rescore
  9. 2026-08-16 01:38 UTCEG score recompute
  10. 2026-08-16 01:38 UTCGHSA enrichment
  11. 2026-08-15 01:30 UTCEPSS rescore
  12. 2026-08-13 22:00 UTCEPSS rescore
  13. 2026-08-13 01:23 UTCEG score recompute
  14. 2026-08-13 01:23 UTCGHSA enrichment
  15. 2026-08-13 00:41 UTCEG score recompute
  16. 2026-08-13 00:41 UTCGHSA enrichment
  17. 2026-08-12 13:50 UTCEPSS rescore
  18. 2026-08-12 01:20 UTCEG score recompute
  19. 2026-08-12 01:20 UTCGHSA enrichment
  20. 2026-08-12 00:40 UTCEG score recompute
  21. 2026-08-12 00:40 UTCGHSA enrichment
  22. 2026-08-11 13:42 UTCEPSS rescore
  23. 2026-08-10 18:24 UTCEG score recompute
  24. 2026-08-10 18:24 UTCGHSA enrichment
  25. 2026-08-10 18:15 UTCEG score recompute
Show 4 more
  1. 2026-08-10 18:15 UTCGHSA enrichment
  2. 2026-08-10 14:29 UTCEG score recompute
  3. 2026-08-10 14:06 UTCEG score recompute
  4. 2026-08-10 14:05 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18503?
CVE-2026-18503 is a low vulnerability published on August 10, 2026. Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().
When was CVE-2026-18503 disclosed?
CVE-2026-18503 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18503 actively exploited?
CVE-2026-18503 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 97.9% of all scored CVEs.
What is the CVSS score of CVE-2026-18503?
CVE-2026-18503 has a CVSS v3 base score of 2.4 (NVD).
How do I remediate CVE-2026-18503?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18503, 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

Explore the affected products and dependency analysis for CVE-2026-18503

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