python-multipart vulnerable to content-type header Regular expression Denial of Service
Kludex · python-multipart
Official source article: GitHub GHSA-2JV5-9R88-3W3P ↗. Check the applicable product and release in the original source.
7.5HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix
High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Published severityHigh→Operational priority:Critical, raised one band.upgradedsince 9 May 2025
Evidence used
No CISA KEV confirmation is currently recorded.
A structured source references public exploit or proof-of-concept material.
The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
EPSS is 1.51% for the current model date.
Compensating controls
Validate the affected product branch and deploy the verified fixed release.
Restrict the affected network interface to trusted sources where business-safe.
Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
Confirm that the asset runs Kludex python-multipart and falls inside the recorded affected range.
Verify the installed build against the product-specific fixed version after deployment.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Cross-source reconciliation
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Debian Security Tracker: 1 affected package state with no published fix
Distribution package intelligence
Release-specific package status
Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
4 package states
Package result overrides the generic status
BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
Distribution release
Source package
Vendor state
Fixed version
Evidence
Debian trixietrixie · source
python-multipart
Vendor fix publishedDebian records a fixed source-package version for this release.
Open-source package ranges1 source-attributed range
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2024-0059
No EUVD known-exploited evidence
ENISA has published the identifier mapping but no EUVD description has been stored yet.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix
High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product
01
What, why and how
`python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests, leading to regular expression denial of service. This vulnerability has been patched in version 0.0.7.
What
`python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests, leading to regular expression denial of service. This vulnerability has been patched in version 0.0.7.
Why
The product does not properly control the allocation and maintenance of a limited resource.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
What
`python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests, leading to regular expression denial of service. This vulnerability has been patched in version 0.0.7.
Why
The product does not properly control the allocation and maintenance of a limited resource.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No confirmed evidence
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.Reference recorded
A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.
Likely attack path
a network path → Uncontrolled Resource Consumption → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.
CVSS vector ?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-400Public exploit reference
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2024-0059Official EUVD mapping
0 linked advisory records.
Official EUVD record ↗BSI · German · WID-SEC-2024-0592IBM App Connect Enterprise: Schwachstelle ermöglicht Denial of Service
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in IBM App Connect Enterprise ausnutzen, um einen Denial of Service Angriff durchzuführen.
Official advisory ↗Cyber Security Agency of Singapore · English · CSA-SB-20240207Security Bulletin 07 Feb 2024
The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 07 Feb 2024, published on 7 February 2024. Open the linked bulletin for the product, severity and reference information published in that issue.
Official advisory ↗CERT-FR · French · CERTFR-2026-AVI-1094Multiples vulnérabilités dans les produits IBM
0
Bulletin de sécurité IBM 7285472 du 27 août 2026
https://www.ibm.com/support/pages/node/7285472
Bulletin de sécurité IBM 7285509 du 28 août 2026
https://www.ibm.com/support/pages/node/7285509
Bulletin de sécurité IBM 7285513 du 28 août 2026
https://www.ibm.com/support/pages/node/7285513
Bulletin de sécurité IBM 7285539 du 28 août 2026
https://www.ibm.com/support/pages/node/7285539
Bulletin de sécurité IBM 7285542 du 28 août 2026
https://www.ibm.com/support/pages/node/7285542
Référence CVE CVE-2018-16487
https://www.cve.org/CVERecord?id=CVE-2018-16487
Référence CVE CVE-2021-23336
https://www.cve.org/CVERecord?id=CVE-2021-23336
Référence CVE CVE-2024-24762
https://www.cve.org/CVERecord?id=CVE-2024-24762
Référence CVE CVE-2025-10263
https://www.cve.org/CVERecord?id=CVE-2025-10263
Référence CVE CVE-2025-13151
https://www.cve.org/CVERecord?id=CVE-2025-13151
Référence CVE CVE-2025-14505
https://www.cve.org/CVERecord?id=CVE-2025-14505
Référence CVE CVE-2025-14914
https://www.cve.org/CVERecord?id=CVE-2025-14914
Référence CVE CVE-2025-14920
https://www.cve.org/CVERecord?id=CVE-2025-14920
Référence CVE CVE-2025-15599
https://www.cve.org/CVERecord?id=CVE-2025-15599
Référence CVE CVE-2025-40026
https://www.cve.org/CVERecord?id=CVE-2025-40026
Référence CVE CVE-2025-47273
https://www.cve.org/CVERecord?id=
Official advisory ↗CERT-FR · French · CERTFR-2025-AVI-0969Multiples vulnérabilités dans les produits VMware
Official advisory ↗CERT-FR · French · CERTFR-2024-AVI-0199Multiples vulnérabilités dans IBM
ord?id=CVE-2023-45857
Référence CVE CVE-2023-47248
https://www.cve.org/CVERecord?id=CVE-2023-47248
Référence CVE CVE-2023-5676
https://www.cve.org/CVERecord?id=CVE-2023-5676
Référence CVE CVE-2024-20918
https://www.cve.org/CVERecord?id=CVE-2024-20918
Référence CVE CVE-2024-20921
https://www.cve.org/CVERecord?id=CVE-2024-20921
Référence CVE CVE-2024-20945
https://www.cve.org/CVERecord?id=CVE-2024-20945
Référence CVE CVE-2024-20952
https://www.cve.org/CVERecord?id=CVE-2024-20952
Référence CVE CVE-2024-23334
https://www.cve.org/CVERecord?id=CVE-2024-23334
Référence CVE CVE-2024-23829
https://www.cve.org/CVERecord?id=CVE-2024-23829
Référence CVE CVE-2024-24762
https://www.cve.org/CVERecord?id=CVE-2024-24762
Gestion détaillée du document
le 08 mars 2024
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Official advisory ↗JVN iPedia · Japanese · JVNDB-2024-002536The FastAPI Expert の python-multipart における非効率的な正規表現の複雑さに関する脆弱性
The FastAPI Expert の python-multipart には、非効率的な正規表現の複雑さに関する脆弱性が存在します。
Operational remediation based on structured source evidence.
Status ?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 5 Feb 2024 · Last source change 9 May 2025, 16:32 UTC · CWE-400 · Uncontrolled Resource Consumption
CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source ?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2024-0059
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.