Skip to content
Noroxi
NVD / CVE Program· CNA GitHub_M

CVE-2026-34516: AIOHTTP: Multipart Header Size Bypass

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.60% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: aio-libs aiohttp 3.13.4.

Low priority for now. Upgrade to aio-libs aiohttp 3.13.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than intended, potentially allowing a DoS vulnerability. This issue has been patched in version 3.13.4.

MediumCVSS 6.6 · v4.0—No exploit Fix available
Published
Apr 1, 2026
Updated
Jun 17, 2026
EPSS
0.6% · 48th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.6
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-34516

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for aiohttp records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
aiohttpaiohttp

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • aiohttp aiohttpbefore 3.13.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • aio-libs aiohttp

    • < 3.13.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12python-aiohttpfrom 0—
Debian:14python-aiohttpbefore 3.13.5-13.13.5-1
openSUSE:Leap 16.0python-aiohttpbefore 3.11.16-160000.5.13.11.16-160000.5.1
openSUSE:Tumbleweedpython-aiohttpbefore 3.13.5-3.13.13.5-3.1
PyPIaiohttpbefore 3.13.43.13.4
SUSE:Linux Enterprise Module for Public Cloud 15 SP4python-aiohttpbefore 3.6.0-150100.3.35.13.6.0-150100.3.35.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP4python-aiohttpbefore 3.9.3-150400.10.43.13.9.3-150400.10.43.1
SUSE:Linux Enterprise Server 16.0python-aiohttpbefore 3.11.16-160000.5.13.11.16-160000.5.1

Same product

aiohttp: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-23334aiohttp.web.static(follow_symlinks=True) is vulnerable to directory traversal
    53Plan
  • CVE-2024-52303aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method
    34Monitor
  • CVE-2025-69223AIOHTTP's HTTP Parser auto_decompress feature is vulnerable to zip bomb
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-34514Apr 1, 2026 · AIOHTTP: CRLF injection in multipart part content type header construction
    10Monitor
  • ← EarlierCVE-2026-34515Apr 1, 2026 · AIOHTTP: UNC SSRF/NTLMv2 Credential Theft/Local File Read in static resource handler on Windows
    26Monitor
  • Later →CVE-2026-34517Apr 1, 2026 · AIOHTTP: Late size enforcement for non-file multipart fields causes memory DoS
    10Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
aio-libs aiohttp3.13.4 · descriptionVendor (CNA)
debian:python-aiohttp3.13.5-1 · Debian:14Package registry (OSV)
opensuse:python-aiohttp3.13.5-3.1 · openSUSE:TumbleweedPackage registry (OSV)
PyPI:aiohttp3.13.4Package registry (OSV)
suse:python-aiohttp3.11.16-160000.5.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5427382 days apartAIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
    26Monitor
  • CVE-2026-5427482 days apartAIOHTTP: Incomplete websocket frame payloads bypass memory limits
    26Monitor
  • CVE-2026-5427782 days apartAIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
    26Monitor
  • CVE-2025-6922885 days apartAIOHTTP vulnerable to denial of service through large payloads
    26Monitor
  • CVE-2025-6922985 days apartAIOHTTP vulnerable to DoS through chunked messages
    26Monitor
  • CVE-2026-345170 days apartAIOHTTP: Late size enforcement for non-file multipart fields causes memory DoS
    10Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records