CVE-2026-103471

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-30. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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

restbed through 5.0.0 buffers HTTP request headers without enforcing a maximum size limit, allowing remote unauthenticated attackers to exhaust server memory. Attackers can open TCP connections and stream bytes indefinitely without sending the header delimiter, forcing the server to allocate unbounded heap memory until the process is killed.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 30, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 30, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

restbed through 5.0.0 Denial of Service via Unbounded Header Buffering | Advisories | VulnCheck

https://www.vulncheck.com/advisories/restbed-through-5.0.0-denial-of-service-via-unbounded-header-buffering
generic

restbed/src/corvusoft/restbed/session.cpp at e1227a297ce6d4e9f78222456507b29bb8ab77e9 · Corvusoft/restbed · GitHub

https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/session.cpp#L200
generic

restbed/src/corvusoft/restbed/detail/service_impl.cpp at e1227a297ce6d4e9f78222456507b29bb8ab77e9 · Corvusoft/restbed · GitHub

https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab77e9/src/corvusoft/restbed/detail/service_impl.cpp#L554
generic

GitHub - Corvusoft/restbed: Corvusoft's Restbed framework brings asynchronous RESTful functionality to C++ applications. · GitHub

https://github.com/Corvusoft/restbed
generic🟡 PoC Available

[Security] Remote Unauthenticated Denial of Service (DoS) — Uncontrolled Resource Consumption · Issue #558 · Corvusoft/restbed · GitHub

https://github.com/Corvusoft/restbed/issues/558

Vendor Advisories for CVE-2026-103471(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 21× in last 7d / 21× 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. 2026-10-04 01:13 UTCEG score recompute
  2. 2026-10-04 01:13 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-03 14:15 UTCGHSA enrichment
  5. 2026-10-03 03:17 UTCEG score recompute
  6. 2026-10-03 03:17 UTCGHSA enrichment
  7. 2026-10-02 16:18 UTCGHSA enrichment
  8. 2026-10-02 05:20 UTCEG score recompute
  9. 2026-10-02 05:20 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 18:20 UTCGHSA enrichment
  12. 2026-10-01 07:20 UTCGHSA enrichment
  13. 2026-09-30 20:22 UTCEG score recompute
  14. 2026-09-30 20:22 UTCGHSA enrichment
  15. 2026-09-30 19:26 UTCEG score recompute
  16. 2026-09-30 19:26 UTCGHSA enrichment
  17. 2026-09-30 19:12 UTCEG score recompute
  18. 2026-09-30 19:12 UTCGHSA enrichment
  19. 2026-09-30 18:26 UTCEG score recompute
  20. 2026-09-30 17:36 UTCEG score recompute
  21. 2026-09-30 17:35 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103471?
CVE-2026-103471 is a high vulnerability published on September 30, 2026. restbed through 5.0.0 buffers HTTP request headers without enforcing a maximum size limit, allowing remote unauthenticated attackers to exhaust server memory. Attackers can open TCP connections and stream bytes indefinitely without sending the header delimiter, forcing the server to allocate…
When was CVE-2026-103471 disclosed?
CVE-2026-103471 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103471 actively exploited?
CVE-2026-103471 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103471?
CVE-2026-103471 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103471?
No fix for CVE-2026-103471 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-103471 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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