CVE-2026-46348

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% 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
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0

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

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, the list of disallowed IP address ranges was lacking an IP address range that can be used to reach local IP addresses. An attacker can use an IP address in the affected range to make Mastodon perform HTTP requests against loopback interfaces, potentially allowing access to otherwise private resources and services. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
25.8%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
Patch available. Sources: github.
github Patch Available

SSRF Bypass via IPv6 Unspecified Address (::) · Advisory · mastodon/mastodon · GitHub

https://github.com/mastodon/mastodon/security/advisories/GHSA-crr4-7rm4-8gpw

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 56× 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. 2026-07-13 22:30 UTCEPSS rescore
  2. 2026-07-13 20:09 UTCEG score recompute
  3. 2026-07-13 07:35 UTCEG score recompute
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 19:00 UTCEG score recompute
  6. 2026-07-12 06:25 UTCEG score recompute
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 17:31 UTCEG score recompute
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-11 04:57 UTCEG score recompute
  11. 2026-07-10 16:21 UTCEG score recompute
  12. 2026-07-10 03:46 UTCEG score recompute
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-09 15:09 UTCEG score recompute
  15. 2026-07-09 02:20 UTCEG score recompute
  16. 2026-07-08 15:16 UTCEPSS rescore
  17. 2026-07-08 13:41 UTCEG score recompute
  18. 2026-07-08 01:04 UTCEG score recompute
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-07 12:29 UTCEG score recompute
  21. 2026-07-06 23:55 UTCEG score recompute
  22. 2026-07-06 16:27 UTCEPSS rescore
  23. 2026-07-06 11:20 UTCEG score recompute
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-05 22:25 UTCEG score recompute
Show 31 more
  1. 2026-07-05 09:49 UTCEG score recompute
  2. 2026-07-05 02:30 UTCEPSS rescore
  3. 2026-07-04 21:10 UTCEG score recompute
  4. 2026-07-04 08:35 UTCEG score recompute
  5. 2026-07-04 06:31 UTCEPSS rescore
  6. 2026-07-03 19:59 UTCEG score recompute
  7. 2026-07-03 07:24 UTCEG score recompute
  8. 2026-07-02 18:49 UTCEG score recompute
  9. 2026-07-02 06:14 UTCEG score recompute
  10. 2026-07-01 17:39 UTCEG score recompute
  11. 2026-07-01 15:07 UTCEPSS rescore
  12. 2026-07-01 05:04 UTCEG score recompute
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 16:29 UTCEG score recompute
  15. 2026-06-30 03:54 UTCEG score recompute
  16. 2026-06-29 15:19 UTCEG score recompute
  17. 2026-06-29 02:44 UTCEG score recompute
  18. 2026-06-28 14:09 UTCEG score recompute
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-28 04:56 UTCEPSS rescore
  22. 2026-06-28 01:34 UTCEG score recompute
  23. 2026-06-27 12:58 UTCEG score recompute
  24. 2026-06-27 03:08 UTCEPSS rescore
  25. 2026-06-27 00:23 UTCEG score recompute
  26. 2026-06-26 11:48 UTCEG score recompute
  27. 2026-06-25 23:13 UTCEG score recompute
  28. 2026-06-25 13:49 UTCEPSS rescore
  29. 2026-06-25 10:38 UTCEG score recompute
  30. 2026-06-24 22:03 UTCEG score recompute
  31. 2026-06-24 22:03 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-46348?
CVE-2026-46348 is a high vulnerability published on June 24, 2026. Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, the list of disallowed IP address ranges was lacking an IP address range that can be used to reach local IP addresses. An attacker can use an IP address in the affected range to make…
When was CVE-2026-46348 disclosed?
CVE-2026-46348 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46348 actively exploited?
CVE-2026-46348 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46348?
CVE-2026-46348 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-46348?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46348, 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.

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