7.3

CVE-2026-34993: AIOHTTP Vulnerable to Deserialization of Untrusted Data

Modified
AliasesGHSA-jg22-mg44-37j8PYSEC-2026-2104UBUNTU-CVE-2026-34993
Published 02-06-2026Last modified 17-09-2026

Vulnerability summary

CVE-2026-34993 is a high (CVSS 7.3) Deserialization of Untrusted Data vulnerability in aio-libs aiohttp. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.3/10
010
High · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · -0.32 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 5
OPENSUSE-SU-2026:21098-1RHSA-2026:50319RHSA-2026:50336RHSA-2026:59135RHSA-2026:59136RHSA-2026:63327

Timeline

  1. 02-06-2026
    PublishedVulnerability first disclosed.
  2. 17-09-2026
    Last modifiedVulnerability information updated.

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, using ``CookieJar.load()`` with untrusted input may allow arbitrary code execution. Most applications using this function will be doing so with the user's own data, so this is unlikely to affect many applications. Version 3.14.0 patches the issue. If an application does allow attacker controlled files to be loaded, a workaround on older releases would be to sanitize the files before loading.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Decrease -0.32 pp

From 0.50% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard37 products
  • airflow-2All versions (No fix recorded)
  • airflow-3< 3.2.2-r1
  • airflow-core-2< 2.11.2-r6
  • awx< 24.6.1-r38
  • checkov< 3.2.533-r1
Wolfi5 products
  • airflow-3< 3.2.2-r1
  • checkov< 3.2.533-r1
  • dask-kubernetes< 2026.3.0-r6
  • katib-earlystopping< 0.19.0-r18
  • open-webui< 0.9.6-r3
Aio-libs1 product
Aiohttp1 product
Debian1 product
  • python-aiohttpAll versions (No fix recorded) | < 3.8.4-1+deb12u2 | < 3.14.0-1
Opensuse1 product
  • python-aiohttp&distro=openSUSE Tumbleweed< 3.14.0-1.1
PyPI1 product
  • aiohttp< 3.14.0
Ubuntu1 product
  • python-aiohttpAll versions (No fix recorded)

8 vendors · 48 products

References

33 links
Show all 33 references