Vulnerability details

CVE-2026-112270

sgl-project SGLang

SGLang through 0.5.22 Memory Exhaustion via Mooncake STAGING_RSP chunk_idx

CVSS 4.0

7.1High

Official description

SGLang through 0.5.22 with the Mooncake disaggregation backend contains an uncontrolled memory allocation vulnerability in handle_staging_rsp() that lets unauthenticated network-adjacent attackers exhaust Prefill memory. Attackers can obtain the rank address from the /route endpoint and send STAGING_RSP messages with huge chunk_idx values under fresh room IDs, causing the scheduler to be OOM-killed.

CVSS scores

Score	Version	Source	Vector
7.1High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`
6.5Medium	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
sgl-project	SGLang	v ≤ 0.5.22	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/sgl-project/sglang/issues/45014 issue-tracking
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/common/staging_handler.py#L505-L548 technical-description
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/mooncake/conn.py#L2885-L2935 technical-description
https://www.vulncheck.com/advisories/sglang-through-0.5.22-memory-exhaustion-via-mooncake-staging-rsp-chunk-idx third-party-advisory

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Details

Published: 2026-10-19
Last updated: 2026-10-19
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.24%

Probability of exploitation in 30 days

16.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-770
Allocation of Resources Without Limits or Throttling