Medium severity · published Oct 19, 2026
CVE-2026-112270
SGLang through 0.5.22 Memory Exhaustion via Mooncake STAGING_RSP chunk_idx
6.5
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SG
sglang · sgl-project
through 0.5.22 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112270
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112270
github.com
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/common/staging_handler.py#L505-L548
github.com
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/mooncake/conn.py#L2885-L2935
github.com
https://github.com/sgl-project/sglang/issues/45014
www.vulncheck.com
https://www.vulncheck.com/advisories/sglang-through-0.5.22-memory-exhaustion-via-mooncake-staging-rsp-chunk-idx
More from sglang
8.6
CVE-2026-92972
SGLang through 0.5.19 Unauthenticated Route Poisoning via PUT endpoint
8.1
CVE-2026-111391
SGLang 0.5.10 through 0.5.22 Code Injection via Debug Dumper Filter
7.5
CVE-2026-112082
sgl-project SGLang Expert-Distribution Recording Endpoint expert_distribution.py Scheduler.expert_distribution_handle denial of service
7.5
CVE-2026-109229
SGLang through 0.5.21 Decompression Bomb DoS via NanoNemotronVLImageProcessor
7.5
CVE-2026-109228
SGLang through 0.5.21 Resource Budget Bypass via GLM-V Video Parameters