CVE-2026-15144

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

@fastify/rate-limit before 11.2.0 keys rate-limit buckets by the verbatim client IP string returned from request.ip. Because a single IPv6 client can control a large address range (a /64 holds 2^64 distinct addresses) and the same address has multiple valid textual representations, an IPv6 capable client can defeat the rate-limit boundary by rotating addresses or by rewriting the same address in different forms. Applications that use @fastify/rate-limit to protect endpoints such as authentication, password reset, OTP delivery, or expensive API calls can be bypassed by IPv6 clients behind a proxy that surfaces IPv6 to the origin when trustProxy is enabled. The issue is fixed in @fastify/rate-limit 11.2.0, where the default key generator normalizes IPv6 addresses to their canonical form, collapses IPv4 mapped IPv6 to IPv4, and applies a configurable prefix mask (default /64) via a new ipv6Subnet option.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 5, 2026

Advisory Details (2)

Auto-updated Jul 29, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
github Patch Available

@fastify/rate-limit vulnerable to rate-limit bypass via IPv6 address rotation · Advisory · fastify/fastify-rate-limit · GitHub

https://github.com/fastify/fastify-rate-limit/security/advisories/GHSA-grpc-p53c-r64v

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 54× 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. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-26 10:29 UTCEG score recompute
  3. 2026-08-25 13:48 UTCEPSS rescore
  4. 2026-08-25 07:49 UTCEG score recompute
  5. 2026-08-23 03:24 UTCEG score recompute
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-22 01:12 UTCEG score recompute
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-20 22:59 UTCEG score recompute
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-19 20:48 UTCEG score recompute
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-18 18:35 UTCEG score recompute
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 15:59 UTCEG score recompute
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 13:47 UTCEG score recompute
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 11:35 UTCEG score recompute
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 09:23 UTCEG score recompute
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 07:11 UTCEG score recompute
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 29 more
  1. 2026-08-12 04:58 UTCEG score recompute
  2. 2026-08-11 13:42 UTCEPSS rescore
  3. 2026-08-11 02:46 UTCEG score recompute
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 00:34 UTCEG score recompute
  6. 2026-08-09 13:46 UTCEPSS rescore
  7. 2026-08-08 22:23 UTCEG score recompute
  8. 2026-08-08 16:37 UTCEPSS rescore
  9. 2026-08-07 20:11 UTCEG score recompute
  10. 2026-08-06 17:59 UTCEG score recompute
  11. 2026-08-06 13:46 UTCEPSS rescore
  12. 2026-08-05 19:17 UTCEPSS rescore
  13. 2026-08-05 15:47 UTCEG score recompute▼ 2.00
  14. 2026-08-05 15:47 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  15. 2026-08-05 01:31 UTCEG score recompute
  16. 2026-08-04 15:09 UTCEPSS rescore
  17. 2026-08-04 12:41 UTCEG score recompute
  18. 2026-08-04 10:38 UTCEPSS rescore
  19. 2026-08-03 10:58 UTCEG score recompute
  20. 2026-08-03 10:35 UTCEPSS rescore
  21. 2026-08-02 09:13 UTCEG score recompute
  22. 2026-08-02 02:26 UTCEPSS rescore
  23. 2026-08-01 07:31 UTCEG score recompute
  24. 2026-08-01 04:15 UTCEPSS rescore
  25. 2026-07-30 16:58 UTCEG score recompute
  26. 2026-07-30 16:27 UTCEPSS rescore
  27. 2026-07-29 17:26 UTCEG score recompute
  28. 2026-07-29 16:38 UTCEG score recompute
  29. 2026-07-29 16:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15144?
CVE-2026-15144 is a medium vulnerability published on July 29, 2026. @fastify/rate-limit before 11.2.0 keys rate-limit buckets by the verbatim client IP string returned from request.ip. Because a single IPv6 client can control a large address range (a /64 holds 2^64 distinct addresses) and the same address has multiple valid textual representations, an IPv6 capable…
When was CVE-2026-15144 disclosed?
CVE-2026-15144 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15144 actively exploited?
CVE-2026-15144 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 84.3% of all scored CVEs.
What is the CVSS score of CVE-2026-15144?
CVE-2026-15144 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-15144?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15144, 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-2026-15144

Explore →

Is Your Infrastructure Affected by CVE-2026-15144?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs