PatchTheCVECVE-2026-48710: Kludex Starlette HTTP Request/Response Smuggling Vulnerability
86
Patch now
MEDIUM 6.5EXPLOITEDREMOTEWATCHLISTUPGRADEUPGRADEDOWNGRADE
CVE-2026-48710 is a medium-severity flaw (CVSS 6.5) affecting starlette, ai inference server, ansible automation platform, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on
Why this priority
- EPSS top 6%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Public exploit reference
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
encode starlette UPGRADE
Affected: >= 0.8.3 and < 1.0.1
Fixed in: 1.0.1
Safe to downgrade to: a release before 0.8.3
1. Check installed version
pip show starlette
2. UPGRADE to 1.0.1
pip install --upgrade "starlette>=1.0.1"
3. If no update is available yet, DOWNGRADE to a release before 0.8.3
pip index versions starlette
pip install "starlette<0.8.3"
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat ai inference server UPGRADE
Affected: >= 3.3.0 and <= 3.3.5
Fixed in: newer than 3.3.5
Safe to downgrade to: a release before 3.3.0
1. Check installed version
apt-cache policy ai-inference-server || rpm -q ai-inference-server || ai-inference-server --version
2. UPGRADE to newer than 3.3.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade ai-inference-server
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade ai-inference-server
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.3.0 (Debian / Ubuntu)
apt-cache madison ai-inference-server
sudo apt install ai-inference-server=<VERSION_BEFORE_3.3.0>
sudo apt-mark hold ai-inference-server
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list ai-inference-server
sudo dnf downgrade ai-inference-server-<VERSION_BEFORE_3.3.0>
sudo dnf versionlock add ai-inference-server
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat ansible automation platform DOWNGRADE
Affected: 2.6 · 2.7
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.6
1. Check installed version
apt-cache policy ansible-automation-platform || rpm -q ansible-automation-platform || ansible-automation-platform --version
2. No fixed release: DOWNGRADE to a release before 2.6 (Debian / Ubuntu)
apt-cache madison ansible-automation-platform
sudo apt install ansible-automation-platform=<VERSION_BEFORE_2.6>
sudo apt-mark hold ansible-automation-platform
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list ansible-automation-platform
sudo dnf downgrade ansible-automation-platform-<VERSION_BEFORE_2.6>
sudo dnf versionlock add ansible-automation-platform
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat migration toolkit for applications UPGRADE
Affected: < 8.2.0
Fixed in: 8.2.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy migration-toolkit-for-applications || rpm -q migration-toolkit-for-applications || migration-toolkit-for-applications --version
2. UPGRADE to 8.2.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade migration-toolkit-for-applications
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade migration-toolkit-for-applications
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat openshift ai UPGRADE
Affected: >= 3.3 and < 3.3.5 · >= 3.4 and < 3.4.2
Fixed in: 3.3.5, 3.4.2
Safe to downgrade to: a release before 3.3
1. Check installed version
apt-cache policy openshift-ai || rpm -q openshift-ai || openshift-ai --version
2. UPGRADE to 3.3.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openshift-ai
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openshift-ai
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.3 (Debian / Ubuntu)
apt-cache madison openshift-ai
sudo apt install openshift-ai=<VERSION_BEFORE_3.3>
sudo apt-mark hold openshift-ai
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openshift-ai
sudo dnf downgrade openshift-ai-<VERSION_BEFORE_3.3>
sudo dnf versionlock add openshift-ai
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat openshift lightspeed MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy openshift-lightspeed || rpm -q openshift-lightspeed || openshift-lightspeed --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
Exact fixes by distribution
A distro patch exists: prefer upgrading over downgrading.
Python (pip) · starlette · FIXED · 1.0.1 · vulnerable: <= 1.0.0 · source
pip install --upgrade "starlette>=1.0.1"
pip show starlette
Fedora 46 · python-streamlink · FIXED · 8.6.2-1.fc46 · FEDORA-2026-a56fcfdc08 · source
sudo dnf upgrade --advisory=FEDORA-2026-a56fcfdc08
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Debian 12 · starlette · FIXED · 0.26.1-1+deb12u1
sudo apt update && sudo apt install --only-upgrade starlette
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' starlette)" ge "0.26.1-1+deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · starlette · FIXED · 0.46.1-3+deb13u2
sudo apt update && sudo apt install --only-upgrade starlette
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' starlette)" ge "0.46.1-3+deb13u2" && echo PATCHED || echo STILL-VULNERABLE
RHEL AI (RHEL AI) 3 · rhelai3/bootc-azure-rocm-rhel9 · NO FIX YET
RHEL AI (RHEL AI) 3 · rhelai3/bootc-gaudi-rhel9 · DEFERRED
RHEL AI (RHEL AI) 3 · rhelai3/bootc-rocm-rhel9 · NO FIX YET
Alpine 3.24 · py3-starlette · FIXED · py3-starlette-1.1.0-r0
apk add --upgrade py3-starlette
apk info -v py3-starlette
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: eris-ths/supply-chain-guard (3 stars)
- GitHub PoC: xtremebeing/starlette-host-header-lab (1 stars)
- GitHub PoC: Bhanunamikaze/BadHost-CVE-2026-48710-Exploit (1 stars)
- Write-up: ostif.org/disclosing-the-badhost-vulnerability-in-starlette
- Write-up: www.secwest.net/starlette
- Write-up: www.wiz.io/blog/ai-infrastructure-honeypot
- Nuclei scan template: Starlette - Improper Validation of Unsafe Equivalence in Input
Verify at the official source NVD · CVE Program · CISA KEV catalog · 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.
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-2026-48710?
starlette: upgrade to 1.0.1; ai inference server: upgrade to newer than 3.3.5; ansible automation platform: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-48710 being exploited?
Yes. CVE-2026-48710 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-48710 affect?
CVE-2026-48710 affects starlette, ai inference server, ansible automation platform. Severity is medium (CVSS 6.5). Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `req
How urgent is CVE-2026-48710?
Priority 86/100. EPSS top 6%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist