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CVE-2026-34519 AIOHTTP: HTTP response splitting via \r in reason phrase

🗓️ 01 Apr 2026 20:26:25Reported by GoogleType 
osv
 osv🔗 osv.dev👁 1 Views

CVE-2026-34519: Aiohttp allowed response splitting via CR in the reason phrase before 3.13.4; it is fixed in 3.13.4.

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Refs
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IBM Security Bulletins		Security Bulletin: Security vulnerability in Python affects IBM Robotic Process Automation and IBM Robotic Process Automation for Cloud Pak
20 Jun 202612:52
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IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in IBM Observability with Instana (OnPrem)
5 Jun 202607:26
–ibm
Tenable Nessus		aioHTTP < 3.13.4 Multiple Vulnerabilities (CVE-2026-22815)
3 Apr 202600:00
–nessus
Tenable Nessus		Debian dla-4613 : python-aiohttp-doc - security update
1 Jun 202600:00
–nessus
Tenable Nessus		SUSE SLES16 Security Update : python-aiohttp (SUSE-SU-2026:22173-1)
26 Jun 202600:00
–nessus
Tenable Nessus		Linux Distros Unpatched Vulnerability : CVE-2026-34519
3 Apr 202600:00
–nessus
ATTACKERKB		CVE-2026-34519
1 Apr 202620:26
–attackerkb
AlpineLinux		CVE-2026-34519
1 Apr 202620:26
–alpinelinux
BDU FSTEC		The vulnerability of the aiohttp HTTP client, related to the failure to handle CRLF sequences in HTTP headers, allows attackers to inject arbitrary HTTP headers.
13 Jul 202600:00
–bdu_fstec
Chainguard		CVE-2026-34519 vulnerabilities
2 Apr 202619:17
–cgr
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15 Jul 2026 01:48Current
5.9Medium risk
Vulners AI Score5.9
CVSS 46.9
EPSS0.00292
aiohttpweb response splittingreason phrasecarriage returnbefore 3.13.4fixed in 3.13.4
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