CVE-2026-102634

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. 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.

SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.

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
45th
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 29, 2026

Last Modified

September 29, 2026

Advisory Details (7)

Auto-updated Sep 29, 2026
No patch confirmed yet.
generic

SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room | Advisories | VulnCheck

https://www.vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplicate-bootstrap-room
generic

GitHub - sgl-project/sglang: SGLang is a high-performance serving framework for large language models and multimodal models. · GitHub

https://github.com/sgl-project/sglang
generic

sglang/python/sglang/srt/managers/io_struct.py at v0.5.20 · sgl-project/sglang · GitHub

https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/managers/io_struct.py#L281
generic

sglang/python/sglang/srt/disaggregation/decode.py at v0.5.20 · sgl-project/sglang · GitHub

https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/decode.py#L942
generic

sglang/python/sglang/srt/disaggregation/mooncake/conn.py at v0.5.20 · sgl-project/sglang · GitHub

https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/mooncake/conn.py#L2760-L2764
generic

sglang/python/sglang/srt/disaggregation/common/conn.py at v0.5.20 · sgl-project/sglang · GitHub

https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L392-L393
generic

[PD disaggregation] Duplicate client-supplied `bootstrap_room` crashes prefill and decode schedulers (uncaught `KeyError` / `ValueError`) # Checklist · Issue #40125 · sgl-project/sglang · GitHub

https://github.com/sgl-project/sglang/issues/40125

Vendor Advisories for CVE-2026-102634(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 23× in last 7d / 23× 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. 2026-10-05 07:12 UTCGHSA enrichment
  2. 2026-10-04 18:00 UTCGHSA enrichment
  3. 2026-10-04 04:49 UTCGHSA enrichment
  4. 2026-10-03 15:39 UTCEG score recompute
  5. 2026-10-03 15:38 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 02:25 UTCEG score recompute
  8. 2026-10-03 02:25 UTCGHSA enrichment
  9. 2026-10-02 13:14 UTCGHSA enrichment
  10. 2026-10-02 00:02 UTCEG score recompute
  11. 2026-10-02 00:02 UTCGHSA enrichment
  12. 2026-10-01 19:49 UTCEPSS rescore
  13. 2026-10-01 10:07 UTCGHSA enrichment
  14. 2026-09-30 20:56 UTCEG score recompute
  15. 2026-09-30 20:56 UTCGHSA enrichment
  16. 2026-09-30 15:02 UTCEPSS rescore
  17. 2026-09-30 07:45 UTCEG score recompute
  18. 2026-09-30 07:45 UTCGHSA enrichment
  19. 2026-09-29 18:31 UTCEG score recompute
  20. 2026-09-29 17:54 UTCEG score recompute
  21. 2026-09-29 17:31 UTCEG score recompute
  22. 2026-09-29 16:29 UTCEG score recompute
  23. 2026-09-29 16:28 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-102634?
CVE-2026-102634 is a high vulnerability published on September 29, 2026. SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstraproom fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstraproom values to crash scheduler processes or hang other…
When was CVE-2026-102634 disclosed?
CVE-2026-102634 was first published on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102634 actively exploited?
CVE-2026-102634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102634?
CVE-2026-102634 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-2026-102634?
No fix for CVE-2026-102634 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-2026-102634 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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