High severity7.5OSV Advisory· Published Oct 28, 2025· Updated Apr 15, 2026
CVE-2025-62727
CVE-2025-62727
Description
Starlette is a lightweight ASGI framework/toolkit. Starting in version 0.39.0 and prior to version 0.49.1 , an unauthenticated attacker can send a crafted HTTP Range header that triggers quadratic-time processing in Starlette's FileResponse Range parsing/merging logic. This enables CPU exhaustion per request, causing denial‑of‑service for endpoints serving files (e.g., StaticFiles or any use of FileResponse). This vulnerability is fixed in 0.49.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
starlettePyPI | >= 0.39.0, < 0.49.1 | 0.49.1 |
Affected products
45- osv-coords44 versionspkg:apk/chainguard/airflow-3pkg:apk/chainguard/airflow-core-3pkg:apk/chainguard/k8s-sidecarpkg:apk/chainguard/kservepkg:apk/chainguard/kserve-agentpkg:apk/chainguard/kserve-agent-compatpkg:apk/chainguard/kserve-managerpkg:apk/chainguard/kserve-manager-compatpkg:apk/chainguard/kserve-qpextpkg:apk/chainguard/kserve-qpext-compatpkg:apk/chainguard/kserve-routerpkg:apk/chainguard/kserve-router-compatpkg:apk/chainguard/kserve-storage-controllerpkg:apk/chainguard/mlflowpkg:apk/chainguard/mlflow-bitnamipkg:apk/chainguard/mlflow-iamguarded-compatpkg:apk/chainguard/nemopkg:apk/chainguard/open-webuipkg:apk/chainguard/open-webui-compatpkg:apk/chainguard/reflexpkg:apk/wolfi/airflow-3pkg:apk/wolfi/k8s-sidecarpkg:apk/wolfi/kservepkg:apk/wolfi/kserve-agentpkg:apk/wolfi/kserve-agent-compatpkg:apk/wolfi/kserve-managerpkg:apk/wolfi/kserve-manager-compatpkg:apk/wolfi/kserve-qpextpkg:apk/wolfi/kserve-qpext-compatpkg:apk/wolfi/kserve-routerpkg:apk/wolfi/kserve-router-compatpkg:apk/wolfi/kserve-storage-controllerpkg:apk/wolfi/mlflowpkg:apk/wolfi/mlflow-bitnamipkg:apk/wolfi/mlflow-iamguarded-compatpkg:apk/wolfi/open-webuipkg:apk/wolfi/open-webui-compatpkg:apk/wolfi/reflexpkg:pypi/starlettepkg:rpm/opensuse/python-sse-starlette&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/python-starlette&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python-starlette&distro=openSUSE%20Tumbleweedpkg:rpm/suse/python-starlette&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/python-starlette&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 3.2.0-r0+ 43 more
- (no CPE)range: < 3.2.0-r0
- (no CPE)range: < 3.2.0-r2
- (no CPE)range: < 2.0.3-r0
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 2.5.2-r1
- (no CPE)range: < 0.6.34-r2
- (no CPE)range: < 0.6.34-r2
- (no CPE)range: < 0.8.17-r0
- (no CPE)range: < 3.2.0-r0
- (no CPE)range: < 2.0.3-r0
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 0.16.0-r5
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 3.5.1-r1
- (no CPE)range: < 0.6.34-r2
- (no CPE)range: < 0.6.34-r2
- (no CPE)range: < 0.8.17-r0
- (no CPE)range: >= 0.39.0, < 0.49.1
- (no CPE)range: < 3.2.0-1.1
- (no CPE)range: < 0.41.3-160000.3.1
- (no CPE)range: < 0.49.1-1.1
- (no CPE)range: < 0.41.3-160000.3.1
- (no CPE)range: < 0.41.3-160000.3.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-7f5h-v6xp-fcq8ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-62727ghsaADVISORY
- github.com/Kludex/starlette/commit/4ea6e22b489ec388d6004cfbca52dd5b147127c5nvdWEB
- github.com/Kludex/starlette/commit/69ed26a85956ef4bd0161807eb27abf49be7cd3cnvdWEB
- github.com/Kludex/starlette/releases/tag/0.49.1nvdWEB
- github.com/Kludex/starlette/security/advisories/GHSA-7f5h-v6xp-fcq8nvdWEB
News mentions
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