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.
CVE-2026-103241
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.7% (53rd percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 5.3 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-09-30) is not newer than that change (2026-10-06), so it does not.
Also known asEUVD-2026-90191 (ENISA EUVD) · GHSA-328r-mpfv-qc55 (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.7%
- EPSS %ILE
- 53rd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 30, 2026
Last Modified
October 6, 2026
Advisory Details (5)
Auto-updated Sep 30, 2026[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[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/50927commit 3439bad37e68 (vllm-project/vllm)
Fix landed in vllm-project/vllm commit 3439bad37e68 — awaiting tagged release
https://github.com/vllm-project/vllm/commit/3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9GitHub - vllm-project/vllm: A high-throughput and memory-efficient inference and serving engine for LLMs · GitHub
https://github.com/vllm-project/vllm/gemma4_stack_overflow.rs · GitHub
https://gist.github.com/Yunzez/8e98d656aa667095b513161eb056d28eVendor 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.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| vllm | 0.0.1 ... 0.9.2 (93 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 66× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-27 20:36 UTCEG score recompute
- 2026-10-27 20:36 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-25 14:56 UTCEG score recompute
- 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-20 19:15 UTCEG score recompute
- 2026-10-20 19:15 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-18 05:09 UTCEG score recompute
- 2026-10-17 19:45 UTCEG score recompute
- 2026-10-17 19:45 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
Show 54 moreShow fewer
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-12 16:40 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-11 23:33 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-11 20:15 UTCEG score recompute
- 2026-10-11 18:28 UTCEG score recompute
- 2026-10-11 15:01 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-11 10:55 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-10 22:16 UTCEG score recompute
- 2026-10-10 22:16 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-10 09:39 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-09 21:03 UTCEG score recompute
- 2026-10-09 21:03 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-09 08:25 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-08 19:48 UTCEG score recompute
- 2026-10-08 19:48 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-08 07:11 UTCEG score recompute
- 2026-10-08 07:11 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-07 18:33 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-07 05:57 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-06 17:20 UTCEG score recompute▲ 2.20
- 2026-10-06 17:20 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-06 17:19 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
- 2026-10-06 16:41 UTCEG score recompute
- 2026-10-06 16:41 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-10-05 16:53 UTCEG score recompute
- 2026-10-05 16:53 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-10-04 17:06 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-03 17:17 UTCEG score recompute
- 2026-10-03 17:17 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-10-02 17:30 UTCEG score recompute
- 2026-10-02 17:29 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-02 17:29 UTCNVD updateCVSS v4 → 5.5
- 2026-10-02 16:31 UTCEG score recompute
- 2026-10-02 16:31 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-10-02 16:30 UTCMITRE cvelistV5CVSS v4 → 6.9
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-10-01 17:33 UTCEG score recompute
- 2026-10-01 17:32 UTCGHSA enrichmentGHSA-328r-mpfv-qc55 · GitHub CVSS 5.3
- 2026-09-30 17:25 UTCEG score recompute
- 2026-09-30 17:24 UTCNVD updateCVSS v4 → 5.5
- 2026-09-30 16:51 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
- 2026-09-30 16:50 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
10 shownPyPI:vllm
Frequently asked(5)
What is CVE-2026-103241?
When was the CVE record for CVE-2026-103241 published?
Is CVE-2026-103241 actively exploited?
What is the CVSS score of CVE-2026-103241?
How do I remediate CVE-2026-103241?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-103241
Is Your Infrastructure Affected by CVE-2026-103241?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.