Medium Denial of service exploit reference

CVE-2026-110809 — sgl-project SGLang Session Cleanup session_controller.py Session.create_req denial of service

A security vulnerability has been detected in sgl-project SGLang up to 0.5.19. Affected by this issue is the function Session.create_req of the file python/sglang/srt/session/session_controller.py of the component Session Cleanup. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

Published Oct 14, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (medium)+3
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Sgl-project

SGLang

CVSS base

4.3

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Sgl-project SGLang).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Sgl-project	SGLang	version 0.5.10version 0.5.19version 0.5.18version 0.5.17version 0.5.16version 0.5.15version 0.5.14version 0.5.13 and 12 more version 0.5.12version 0.5.11version 0.5.0version 0.5.9version 0.5.8version 0.5.7version 0.5.6version 0.5.5version 0.5.4version 0.5.3version 0.5.2version 0.5.1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
2.1	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	2.8	1.4	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.3	CVSS 3.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.0	CVSS 2.0	Medium	8.0	2.9	cna@vuldb.com via NIST National Vulnerability Database
4.0	CVSS 2.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-404 · Improper Resource Shutdown or Release

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Track CPU/memory spikes and availability drops correlated with request patterns.

web/proxy/WAF logsnetwork IDS/IPSresource metrics

Timeline

What happened to this CVE, newest first.

2026
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Affected products added · sgl-project/sglang
Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 14, 2026
CVSS changed · 4.3
Oct 14, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · Alertas do Telegram
CVE published
Oct 14, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

8 on the record

github.com/sgl-project/sglang/pull/41483
issue-tracking, patch, NIST National Vulnerability Database
vuldb.com/submit/1004356
third-party-advisory, NIST National Vulnerability Database
github.com/sgl-project/sglang/issues/41470
issue-tracking, NIST National Vulnerability Database
github.com/sgl-project/sglang/
product, NIST National Vulnerability Database
vuldb.com/vuln/420279/cti
signature, permissions-required, NIST National Vulnerability Database
gist.github.com/Yunzez/dbd254603fa2bc74358cb3647423d0ec
exploit, NIST National Vulnerability Database
vuldb.com/vuln/420279
vdb-entry, technical-description, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-110809
third-party-advisory, NIST National Vulnerability Database

Elsewhere on this site

Sgl-project
every CVE for this vendor

Denial of service
same class

CWE-404
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-110807 sgl-project SGLang generate Endpoint io_struct.py denial of service 23h
High CVE-2026-109229 SGLang through 0.5.21 Decompression Bomb DoS via NanoNemotronVLImageProcessor 3d
High CVE-2026-109228 SGLang through 0.5.21 Resource Budget Bypass via GLM-V Video Parameters 3d
High CVE-2026-109225 SGLang through 0.5.21 Memory Exhaustion DoS via /v1/audio/transcriptions Upload 3d
High CVE-2026-109226 SGLang through 0.5.21 Audio Decompression Amplification via load_audio 3d
High CVE-2026-109227 SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-110809 is "sgl-project SGLang Session Cleanup session_controller.py Session.create_req denial of service", rated Medium. It affects SGLang (Sgl-project); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.3 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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