CVE-2026-103241

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-30. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A flaw has been found in vllm-project vLLM up to 0.26.0. This vulnerability affects unknown code of the file rust/src/parser/src/unified/gemma4.rs of the component Gemma4UnifiedParser. Executing a manipulation can lead to denial of service. The attack may be launched remotely. The exploit has been published and may be used. Upgrading to version 0.29.1rc0 is able to resolve this issue. This patch is called 3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9. Upgrading the affected component is advised.

CVSS v3
5.3
EG Score
5.3MEDIUMhigh confidence
EG Risk
55
EG Risk 55/100CISA 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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release.
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. 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 until it ships, then apply the release.

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

October 2, 2026

Advisory Details (5)

Auto-updated Sep 30, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_pr

[Rust Frontend] Bound recursive argument parsers

Fix merged in vllm-project/vllm PR #54303 on 2026-09-01 — awaiting tagged release

https://github.com/vllm-project/vllm/pull/54303
generic

[Bug]: stack overflow causing system crash: Rust unbounded recursion in the Gemma4 unified parser · Issue #50927 · vllm-project/vllm · GitHub

https://github.com/vllm-project/vllm/issues/50927
github_commit

commit 3439bad37e68 (vllm-project/vllm)

Fix landed in vllm-project/vllm commit 3439bad37e68 — awaiting tagged release

https://github.com/vllm-project/vllm/commit/3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9
generic

GitHub - vllm-project/vllm: A high-throughput and memory-efficient inference and serving engine for LLMs · GitHub

https://github.com/vllm-project/vllm/
generic

gemma4_stack_overflow.rs · GitHub

https://gist.github.com/Yunzez/8e98d656aa667095b513161eb056d28e

Vendor Advisories for CVE-2026-103241(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 16× in last 7d / 16× 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. 2026-10-03 17:17 UTCEG score recompute
  2. 2026-10-03 17:17 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-02 17:30 UTCEG score recompute
  5. 2026-10-02 17:29 UTCGHSA enrichment
  6. 2026-10-02 17:29 UTCNVD updateCVSS v4 → 5.5
  7. 2026-10-02 16:31 UTCEG score recompute
  8. 2026-10-02 16:31 UTCGHSA enrichment
  9. 2026-10-02 16:30 UTCMITRE cvelistV5CVSS v4 → 6.9
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 17:33 UTCEG score recompute
  12. 2026-10-01 17:32 UTCGHSA enrichment
  13. 2026-09-30 17:25 UTCEG score recompute
  14. 2026-09-30 17:24 UTCNVD updateCVSS v4 → 5.5
  15. 2026-09-30 16:51 UTCEG score recompute
  16. 2026-09-30 16:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-103241?
CVE-2026-103241 is a medium vulnerability published on September 30, 2026. A flaw has been found in vllm-project vLLM up to 0.26.0. This vulnerability affects unknown code of the file rust/src/parser/src/unified/gemma4.rs of the component Gemma4UnifiedParser. Executing a manipulation can lead to denial of service. The attack may be launched remotely. The exploit has been…
When was CVE-2026-103241 disclosed?
CVE-2026-103241 was first published on September 30, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103241 actively exploited?
CVE-2026-103241 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103241?
CVE-2026-103241 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103241?
An upstream fix for CVE-2026-103241 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-103241 are linked in the Vendor Advisories panel on this page.

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