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Vulnerability Details :

CVE-2026-34514

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-01 Apr, 2026 | 20:09
Updated At-02 Apr, 2026 | 14:07
Rejected At-
Credits

AIOHTTP: CRLF injection in multipart part content type header construction

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:01 Apr, 2026 | 20:09
Updated At:02 Apr, 2026 | 14:07
Rejected At:
▼CVE Numbering Authority (CNA)
AIOHTTP: CRLF injection in multipart part content type header construction

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

Affected Products
Vendor
aio-libs
Product
aiohttp
Versions
Affected
  • < 3.13.4
Problem Types
TypeCWE IDDescription
CWECWE-113CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Type: CWE
CWE ID: CWE-113
Description: CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Metrics
VersionBase scoreBase severityVector
4.02.7LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Version: 4.0
Base score: 2.7
Base severity: LOW
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06
x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
x_refsource_MISC
Hyperlink: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06
Resource:
x_refsource_MISC
Hyperlink: https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:01 Apr, 2026 | 21:16
Updated At:03 Apr, 2026 | 16:10

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.02.7LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 2.7
Base severity: LOW
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-113Primarysecurity-advisories@github.com
CWE ID: CWE-113
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06security-advisories@github.com
N/A
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4security-advisories@github.com
N/A
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5security-advisories@github.com
N/A
Hyperlink: https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

3Records found
CVE-2026-34519
Matching Score-10
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ShareView Details
Matching Score-10
Assigner-GitHub, Inc.
CVSS Score-2.7||LOW
EPSS-0.06% / 17.70%
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7 Day CHG~0.00%
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Updated-16 Apr, 2026 | 16:28
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AIOHTTP: HTTP response splitting via \r in reason phrase

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Action-Not Available
Vendor-aiohttpaio-libs
Product-aiohttpaiohttp
CWE ID-CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CVE-2026-34520
Matching Score-10
Assigner-GitHub, Inc.
ShareView Details
Matching Score-10
Assigner-GitHub, Inc.
CVSS Score-2.7||LOW
EPSS-0.08% / 23.95%
||
7 Day CHG~0.00%
Published-01 Apr, 2026 | 20:27
Updated-16 Apr, 2026 | 16:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
AIOHTTP: C parser (llhttp) accepts null bytes and control characters in response header values - header injection / security bypass

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser (the default for most installs) accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4.

Action-Not Available
Vendor-aiohttpaio-libs
Product-aiohttpaiohttp
CWE ID-CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CVE-2025-69225
Matching Score-8
Assigner-GitHub, Inc.
ShareView Details
Matching Score-8
Assigner-GitHub, Inc.
CVSS Score-2.7||LOW
EPSS-0.04% / 12.71%
||
7 Day CHG+0.01%
Published-05 Jan, 2026 | 23:16
Updated-14 Jan, 2026 | 19:13
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.

Action-Not Available
Vendor-aiohttpaio-libs
Product-aiohttpaiohttp
CWE ID-CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Details not found