CVE-2026-49468: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format

Q: How do I fix CVE-2026-49468?

litellm: upgrade to 1.84.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-49468 being exploited?

CVE-2026-49468 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-2026-49468 affect?

CVE-2026-49468 affects litellm. Severity is critical (CVSS 9.8). LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management ro

Q: How urgent is CVE-2026-49468?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-49468 is a critical-severity flaw (CVSS 9.8) affecting litellm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management routes. The auth layer derived the effective route from request.url.path in litellm/proxy/auth/auth_utils.py::get_request_route(), which Starlette reconstructs from the Host header. A crafted Host could therefore

Why this priority

Critical severity
Public exploit reference
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	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-290
Published	2026-06-22
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: litellm

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 21:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

litellm litellm UPGRADE

Affected: < 1.84.0

Fixed in: 1.84.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.84.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade litellm

Note

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

Exact fixes by distribution

Python (pip) · litellm · FIXED · 1.84.0 · vulnerable: < 1.84.0 · source

pip install --upgrade "litellm>=1.84.0" pip show litellm

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: BiiTts/CVE-2026-49468-LiteLLM-Auth-Bypass (5 stars)
Nuclei scan template: LiteLLM Proxy < 1.84.0 - Host Header Authentication Bypass

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-2026-49468?

litellm: upgrade to 1.84.0. Exact commands for each OS are on this page.

Is CVE-2026-49468 being exploited?

CVE-2026-49468 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-2026-49468 affect?

CVE-2026-49468 affects litellm. Severity is critical (CVSS 9.8). LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management ro

How urgent is CVE-2026-49468?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

OpenAI and LLM tools vulnerabilities

Related CVEs

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CVE-2026-12796 MEDIUM 6.3 UPGRADE A vulnerability was identified in BerriAI litellm up to 1.82.2
CVE-2026-12770 MEDIUM 5.4 UPGRADE A vulnerability was determined in BerriAI litellm up to 1.63.1
CVE-2026-12772 MEDIUM 6.3 UPGRADE A security flaw has been discovered in BerriAI litellm up to 1.82.2

References

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