BlackTreeCVE Intelligence
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Full vulnerability report · 2023
CVE-2023-49081High confidence

aiohttp's ClientSession is vulnerable to CRLF injection via version

aio-libs · aiohttp

Official source article: GitHub GHSA-Q3QX-C6G2-7PW2 ↗. Check the applicable product and release in the original source.

7.2HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 23 Jun 2026

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 0.88% for the current model date.

Compensating controls

  • 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

  1. Confirm that the asset runs aio-libs aiohttp and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

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
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 releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcepython-aiohttpVendor fix publishedDebian records a fixed source-package version for this release.3.9.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcepython-aiohttpVendor fix publishedDebian records a fixed source-package version for this release.3.8.4-1+deb12u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcepython-aiohttpVendor fix publishedDebian records a fixed source-package version for this release.3.9.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcepython-aiohttpVendor fix publishedDebian records a fixed source-package version for this release.3.9.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
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.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
pipaiohttp< 3.9.03.9.0GitHub advisory ↗upstream repository advisory · 3 Nov 2025
Optional official sources

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-2023-0006

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 actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.

What

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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 → Improper Input Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-20 ↗

CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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:C/C:L/I:L/A:N

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.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
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.
NetworkUnauthenticatedCWE-20Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2024-0949Red Hat Satellite: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Satellite ausnutzen, um Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen offenzulegen, Dateien zu manipulieren, HTTP-Request-Smuggling-Angriffe durchzuführen oder Phishing- und Cross-Site-Scripting (XSS)-Angriffe auszuführen.

Official advisory ↗
BSI · German · WID-SEC-2024-0522Red Hat Ansible Automation Platform: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Ansible Automation Platform ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen offenzulegen, Sicherheitsmaßnahmen zu umgehen, Dateien zu manipulieren, Phishing-Angriffe durchzuführen oder Cross-Site Scripting (XSS)-Angriffe auszuführen. Einige dieser Schwachstellen erfordern eine Benutzerinteraktion, um sie erfolgreich auszunutzen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20231206Security Bulletin 06 Dec 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 06 Dec 2023, published on 6 December 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0627Multiples vulnérabilités dans les produits Splunk

ecord?id=CVE-2023-34454 Référence CVE CVE-2023-34455 https://www.cve.org/CVERecord?id=CVE-2023-34455 Référence CVE CVE-2023-3635 https://www.cve.org/CVERecord?id=CVE-2023-3635 Référence CVE CVE-2023-37920 https://www.cve.org/CVERecord?id=CVE-2023-37920 Référence CVE CVE-2023-39410 https://www.cve.org/CVERecord?id=CVE-2023-39410 Référence CVE CVE-2023-43642 https://www.cve.org/CVERecord?id=CVE-2023-43642 Référence CVE CVE-2023-44487 https://www.cve.org/CVERecord?id=CVE-2023-44487 Référence CVE CVE-2023-47627 https://www.cve.org/CVERecord?id=CVE-2023-47627 Référence CVE CVE-2023-4807 https://www.cve.org/CVERecord?id=CVE-2023-4807 Référence CVE CVE-2023-49081 https://www.cve.org/CVERecord?id=CVE-2023-49081 Référence CVE CVE-2023-49082 https://www.cve.org/CVERecord?id=CVE-2023-49082 Référence CVE CVE-2023-49083 https://www.cve.org/CVERecord?id=CVE-2023-49083 Référence CVE CVE-2023-50782 https://www.cve.org/CVERecord?id=CVE-2023-50782 Référence CVE CVE-2023-5408 https://www.cve.org/CVERecord?id=CVE-2023-5408 Référence CVE CVE-2023-5590 https://www.cve.org/CVERecord?id=CVE-2023-5590 Référence CVE CVE-2024-0397 https://www.cve.org/CVERecord?id=CVE-2024-0397 Référence CVE CVE-2024-10220 https://www.cve.org/CVERecord?id=CVE-2024-10220 Référence CVE CVE-2024-11053 https://www.cve.org/CVERecord?id=CVE-20

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0145Multiples vulnérabilités dans les produits IBM

ord?id=CVE-2023-47141 Référence CVE CVE-2023-47145 https://www.cve.org/CVERecord?id=CVE-2023-47145 Référence CVE CVE-2023-47152 https://www.cve.org/CVERecord?id=CVE-2023-47152 Référence CVE CVE-2023-47158 https://www.cve.org/CVERecord?id=CVE-2023-47158 Référence CVE CVE-2023-47627 https://www.cve.org/CVERecord?id=CVE-2023-47627 Référence CVE CVE-2023-47701 https://www.cve.org/CVERecord?id=CVE-2023-47701 Référence CVE CVE-2023-47746 https://www.cve.org/CVERecord?id=CVE-2023-47746 Référence CVE CVE-2023-47747 https://www.cve.org/CVERecord?id=CVE-2023-47747 Référence CVE CVE-2023-4807 https://www.cve.org/CVERecord?id=CVE-2023-4807 Référence CVE CVE-2023-49081 https://www.cve.org/CVERecord?id=CVE-2023-49081 Référence CVE CVE-2023-49082 https://www.cve.org/CVERecord?id=CVE-2023-49082 Référence CVE CVE-2023-50308 https://www.cve.org/CVERecord?id=CVE-2023-50308 Référence CVE CVE-2023-5363 https://www.cve.org/CVERecord?id=CVE-2023-5363 Référence CVE CVE-2023-5676 https://www.cve.org/CVERecord?id=CVE-2023-5676 Référence CVE CVE-2023-5678 https://www.cve.org/CVERecord?id=CVE-2023-5678 Référence CVE CVE-2023-6129 https://www.cve.org/CVERecord?id=CVE-2023-6129 Référence CVE CVE-2023-6681 https://www.cve.org/CVERecord?id=CVE-2023-6681 Référence CVE CVE-2024-0727 https://www.cve.org/CVERecord?id=CVE-2024-07

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-026292aiohttp project の aiohttp における脆弱性

aiohttp project の aiohttp には、不特定の脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

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.
Fix not verified
Affected
aiohttp: < 3.9.0
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
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 30 Nov 2023 · Last source change 23 Jun 2026, 17:19 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.2
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-2023-0006
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
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.
Free version - for non-commercial use only.CVE-2023-49081 · cve.blacktree.nl