CVE-2026-15969: SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomp

Q: How do I fix CVE-2026-15969?

sglang: upgrade to newer than 0.5.15. Exact commands for each OS are on this page.

Q: Is CVE-2026-15969 being exploited?

CVE-2026-15969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-15969 affect?

CVE-2026-15969 affects sglang. Severity is critical (CVSS 9.8). SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary command execution through crafted base64-encoded pickle payloads.

Q: How urgent is CVE-2026-15969?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-15969 is a critical-severity flaw (CVSS 9.8) affecting sglang. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary command execution through crafted base64-encoded pickle payloads.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-30
Last modified	2026-08-04

Publisher (CNA): CERT/CC · Vendor: lmsys

Last updated 2026-08-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-30 19:17 UTCPublished CVE record published
2026-08-04 20:43 UTCUpdated Record last modified

lmsys sglang UPGRADE

Affected: <= 0.5.15

Fixed in: newer than 0.5.15

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sglang || rpm -q sglang || sglang --version

2. UPGRADE to newer than 0.5.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sglang

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sglang

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · gram_grep · FIXED · 0.10.3-2.eln159 · FEDORA-2026-29427819d0 · source

sudo dnf upgrade --advisory=FEDORA-2026-29427819d0

Fedora 46 · python3.11 · FIXED · 3.11.18-1.fc46 · FEDORA-2026-cc775894f4 · source

sudo dnf upgrade --advisory=FEDORA-2026-cc775894f4

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-15969?

sglang: upgrade to newer than 0.5.15. Exact commands for each OS are on this page.

Is CVE-2026-15969 being exploited?

CVE-2026-15969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-15969 affect?

CVE-2026-15969 affects sglang. Severity is critical (CVSS 9.8). SGLang contains an unauthenticated RCE in /load_lora_adapter_from_tensors via bypass of SafeUnpickler’s incomplete denylist, allowing arbitrary command execution through crafted base64-encoded pickle payloads.

How urgent is CVE-2026-15969?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

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References

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