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Advisory record · GHSA-2vrm-gr82-f7m5

AIOHTTP has CRLF injection through multipart part content type header construction

CVSS 2.7 LowEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 1 Apr 2026, 21:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.13.43.13.4
Identifiers
GHSA-2vrm-gr82-f7m5 · CVE-2026-34514 · PYSEC-2026-2096
Weakness (CWE)
CWE-113
Tags
Published
1 Apr 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The aiohttp package, versions before 3.13.4, is vulnerable to CRLF injection through the content type parameter used when building multipart request parts. An attacker who can control that value, which requires an application that passes untrusted data into it, could inject extra headers and alter the request sent. Upgrade to aiohttp 3.13.4 or later. The source gives few further details.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.7 Low 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Mar 2026, 23:58 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:34 UTC First seen by agentprime
  3. 31 Oct 2026, 14:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.