CVE-2026-50129

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: 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 4.5.11, 4.4.18, and 4.3.24, a DoS can be triggered by (Uncaught Exception vulerability), due to missing exception handling in the math sanitizer. Malformed nodes can result in a DoS of a whole server or targeted users services, depending on the type of action that includes the malformed nodes and the services interacting with it. This vulnerability is fixed in 4.5.11, 4.4.18, and 4.3.24.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
17.7%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

DoS via unhandled NoMethodError in MATH_TRANSFORMER · Advisory · mastodon/mastodon · GitHub

https://github.com/mastodon/mastodon/security/advisories/GHSA-qrgq-9fx2-vf2r

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× 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. 2026-07-11 15:14 UTCEG score recompute
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 02:45 UTCEG score recompute
  5. 2026-07-10 14:17 UTCEG score recompute
  6. 2026-07-10 01:37 UTCEG score recompute
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 13:04 UTCEG score recompute
  10. 2026-07-09 00:34 UTCEG score recompute
  11. 2026-07-08 15:16 UTCEPSS rescore
  12. 2026-07-08 15:16 UTCEPSS rescore
  13. 2026-07-08 12:04 UTCEG score recompute
  14. 2026-07-07 23:28 UTCEG score recompute
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-07 10:59 UTCEG score recompute
  17. 2026-07-06 21:40 UTCEG score recompute
  18. 2026-07-06 16:27 UTCEPSS rescore
  19. 2026-07-06 09:12 UTCEG score recompute
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-05 20:40 UTCEG score recompute
  22. 2026-07-05 08:12 UTCEG score recompute
  23. 2026-07-05 02:30 UTCEPSS rescore
  24. 2026-07-04 19:44 UTCEG score recompute
  25. 2026-07-04 07:15 UTCEG score recompute
Show 29 more
  1. 2026-07-04 06:31 UTCEPSS rescore
  2. 2026-07-03 18:17 UTCEG score recompute
  3. 2026-07-03 05:46 UTCEG score recompute
  4. 2026-07-02 17:15 UTCEG score recompute
  5. 2026-07-02 04:45 UTCEG score recompute
  6. 2026-07-01 16:15 UTCEG score recompute
  7. 2026-07-01 15:07 UTCEPSS rescore
  8. 2026-07-01 03:47 UTCEG score recompute
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 15:18 UTCEG score recompute
  11. 2026-06-30 02:50 UTCEG score recompute
  12. 2026-06-29 14:21 UTCEG score recompute
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 01:53 UTCEG score recompute
  16. 2026-06-28 14:07 UTCEPSS rescore
  17. 2026-06-28 13:24 UTCEG score recompute
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-28 00:56 UTCEG score recompute
  21. 2026-06-27 12:27 UTCEG score recompute
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 23:58 UTCEG score recompute
  24. 2026-06-26 11:30 UTCEG score recompute
  25. 2026-06-25 23:01 UTCEG score recompute
  26. 2026-06-25 13:49 UTCEPSS rescore
  27. 2026-06-25 10:32 UTCEG score recompute
  28. 2026-06-24 22:03 UTCEG score recompute
  29. 2026-06-24 22:03 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-50129?
CVE-2026-50129 is a high vulnerability published on June 24, 2026. Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.11, 4.4.18, and 4.3.24, a DoS can be triggered by (Uncaught Exception vulerability), due to missing exception handling in the math sanitizer. Malformed <math> nodes can result in a DoS of a whole server or…
When was CVE-2026-50129 disclosed?
CVE-2026-50129 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-2026-50129 actively exploited?
CVE-2026-50129 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-50129?
CVE-2026-50129 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-50129?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50129, 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-2026-50129

Explore →

Is Your Infrastructure Affected by CVE-2026-50129?

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

Start Free Scan →Browse All CVEs