Medium severity · published Oct 19, 2026
CVE-2026-112269
SGLang through 0.5.22 Memory Exhaustion via Unauthenticated Mooncake Decode Registrations
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
SGLang through 0.5.22 with the Mooncake disaggregation backend accepts unauthenticated decode registration messages on the Prefill rank ZMQ PULL socket, allowing denial of service. Network-adjacent attackers can send many registrations with unique mooncake_session_id values and large nested-buffer frames to exhaust Prefill memory until the scheduler is 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)0.5% · higher than 42% 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-2026-112269
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112269
github.com
https://github.com/sgl-project/sglang/blob/v0.5.22/python/sglang/srt/disaggregation/common/utils.py#L47-L69
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/blob/v0.5.22/python/sglang/srt/disaggregation/mooncake/conn.py#L889-L909
github.com
https://github.com/sgl-project/sglang/issues/45012
www.vulncheck.com
https://www.vulncheck.com/advisories/sglang-through-0.5.22-memory-exhaustion-via-unauthenticated-mooncake-decode-registrations
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