CVE-2026-26448

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Stomper 5e2741e is vulnerable to Use-After-Free. When a client sends multiple CONNECT frames on the same TCP connection, and subsequently another client (or a later connection) sends SEND frames to a destination previously subscribed on that connection, the broker may dereference a pointer to a StompStreamSocket object that has already been freed. This results in a heap use-after-free and process crash. Because the protocol does not authenticate or restrict such sequences by default.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

bug_report/Stomp/stomper_vuln4.md at master · songxpu/bug_report · GitHub

https://github.com/songxpu/bug_report/blob/master/Stomp/stomper_vuln4.md
generic

GitHub - mdoi/stomper: An implementation of message broker of the Streaming Text Orientated Messaging Protocol · GitHub

https://github.com/mdoi/stomper

Vendor Advisories for CVE-2026-26448(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 28× in last 7d / 28× 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. 2026-08-30 05:18 UTCEG score recompute
  2. 2026-08-30 05:17 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-30 01:21 UTCGHSA enrichment
  5. 2026-08-29 21:25 UTCGHSA enrichment
  6. 2026-08-29 17:29 UTCGHSA enrichment
  7. 2026-08-29 13:31 UTCGHSA enrichment
  8. 2026-08-29 09:34 UTCGHSA enrichment
  9. 2026-08-29 05:38 UTCGHSA enrichment
  10. 2026-08-29 01:40 UTCGHSA enrichment
  11. 2026-08-28 21:41 UTCEG score recompute
  12. 2026-08-28 21:41 UTCGHSA enrichment
  13. 2026-08-28 21:41 UTCEPSS rescore
  14. 2026-08-28 16:22 UTCGHSA enrichment
  15. 2026-08-28 12:21 UTCGHSA enrichment
  16. 2026-08-28 08:21 UTCGHSA enrichment
  17. 2026-08-28 04:23 UTCGHSA enrichment
  18. 2026-08-28 00:26 UTCEG score recompute
  19. 2026-08-28 00:26 UTCGHSA enrichment
  20. 2026-08-27 20:28 UTCEG score recompute
  21. 2026-08-27 20:28 UTCGHSA enrichment
  22. 2026-08-27 20:16 UTCEG score recompute▲ 9.80
  23. 2026-08-27 20:16 UTCGHSA enrichment
  24. 2026-08-27 20:13 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 3 more
  1. 2026-08-26 20:24 UTCNVD update
  2. 2026-08-26 20:07 UTCEG score recompute
  3. 2026-08-26 20:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-26448?
CVE-2026-26448 is a critical vulnerability published on August 26, 2026. Stomper 5e2741e is vulnerable to Use-After-Free. When a client sends multiple CONNECT frames on the same TCP connection, and subsequently another client (or a later connection) sends SEND frames to a destination previously subscribed on that connection, the broker may dereference a pointer to a…
When was CVE-2026-26448 disclosed?
CVE-2026-26448 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26448 actively exploited?
CVE-2026-26448 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 69.2% of all scored CVEs.
What is the CVSS score of CVE-2026-26448?
CVE-2026-26448 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-26448?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26448, 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

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