CVE-2026-34518

Aliases:GHSA-966j-vmvw-g2g9PYSEC-2026-2100UBUNTU-CVE-2026-34518DEBIAN-CVE-2026-34518CGA-32h2-pq65-vhwqCGA-4727-x5w8-xwvgCGA-47cc-3fr4-vxhpCGA-5233-hwh4-mwjfCGA-5mx9-58x2-j54cCGA-8jv9-p2jc-33r6CGA-95w3-6rvc-353wCGA-9g9p-xw3x-rpmjCGA-c4gc-gmjp-jm6qCGA-f984-cxm7-vpq2CGA-gfcj-g5fm-vxvqCGA-hq2g-hh25-2p8jCGA-p694-3q8p-chm7CGA-22rq-w2p5-vc98CGA-2349-pqc3-fg25CGA-2c7h-3394-88pvCGA-2cjm-qfxc-h95hCGA-2q34-q9wq-x3jwCGA-3ch9-cg4x-2496CGA-4cr3-m5jg-c3j5CGA-4j45-672j-46jmCGA-696h-8h5x-pr9fCGA-7jrp-2rhr-3fr6CGA-7vh9-7rvj-v327CGA-c48w-xf95-7962CGA-c5jg-7hg7-3r4vCGA-c87f-6xpx-qxcjCGA-f424-3jh8-fprpCGA-f8rc-2q7v-89vpCGA-f9j7-x5wj-hr5hCGA-g54v-q2jp-jvfcCGA-gqmc-wj8r-vvm6CGA-h26x-869m-w6r8CGA-h2w2-67fh-v9pwCGA-h3mx-qgmj-qgm7CGA-j3c8-9ww5-wqprCGA-jgxg-f5cr-24c5CGA-mj73-69mv-pphqCGA-pm59-rgcp-38wrCGA-prg8-3fvx-84jpCGA-q23g-3wpf-2rj6CGA-q3g7-v454-r2ppCGA-q4wh-mfgh-q4r7CGA-qvc6-5282-6gm2CGA-r52v-vwq4-59x8CGA-rhwq-7w6j-55c7CGA-v4v7-2p8r-cjqpCGA-v8gg-q537-9cc9CGA-vf52-592c-x7xqCGA-vh8x-rgfp-gfw6CGA-w93x-hv22-935qCGA-wf9r-48wq-245pCGA-wp9f-97r2-5h98CGA-wrhc-rrqx-qmjxCGA-wv7f-qxwc-4xxqCGA-x3jq-hrw9-f439CGA-xc6p-h6f8-f46rCGA-xpf8-9jxp-3xh6CGA-xv68-99gc-j5rwCGA-xw7j-f7ff-7hx7
Advisory lineage Upstream: 0 Downstream: 6
Analyzed
Published: 01 Apr 2026, 20:15
Last modified:02 Apr 2026, 14:06

Vulnerability Summary

Overall Risk (default)
low
21/100
CVSS Score
5.3 MEDIUM
v3.1 (nvd)
EPSS Score
0.34% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 Apr 2026, 20:15
Published
Vulnerability first disclosed
02 Apr 2026, 14:06
Last Modified
Vulnerability information updated

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, when following redirects to a different origin, aiohttp drops the Authorization header, but retains the Cookie and Proxy-Authorization headers. This issue has been patched in version 3.13.4.

CVSS Metrics

  • v4.0•LOW•Score: 2.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
  • v4.0•LOW•Score: 2.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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
  • v3.1•MEDIUM•Score: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Trends

Current EPSS score: 0.34%• Percentile: 27%

Techniques & Countermeasures

  • CWE-200•Exposure of Sensitive Information to an Unauthorized Actor

    The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Affected Systems

  • aio-libs•aiohttp

    < 3.13.4

  • aiohttp•aiohttp

    < 3.13.4

  • chainguard•airflow-2

    < 2.11.2-r5

  • chainguard•airflow-3

    < 3.2.1-r0 | < 3.1.8-r11

  • chainguard•airflow-core-2

    < 2.11.2-r3

  • chainguard•authentik-2025.12

    < 2025.12.4-r3

  • chainguard•authentik-2026.2

    < 2026.2.1-r3

  • chainguard•authentik-fips-2025.12

    < 2025.12.4-r3

  • chainguard•authentik-fips-2026.2

    < 2026.2.1-r3

  • chainguard•awx

    < 24.6.1-r33

  • chainguard•checkov

    < 3.2.517-r0

  • chainguard•dask-kubernetes

    < 2026.3.0-r3

  • chainguard•datahub-ingestion

    < 1.6.0-r1

  • chainguard•datahub-ingestion-fips

    < 1.5.0.1-r1

  • chainguard•keep-api

    < 0.51.0-r2

  • chainguard•keep-api-fips

    < 0.51.0-r2

  • chainguard•kserve-storage-controller

    < 0.17.0-r2

  • chainguard•kubeflow-pipelines-visualization-server

    < 2.16.0-r4

  • chainguard•litellm

    < 1.82.3.0-r3

  • chainguard•metaflow-service

    < 2.5.0-r10

  • chainguard•metaflow-service-fips

    < 2.5.0-r2

  • chainguard•open-webui

    < 0.8.12-r3

  • chainguard•py3-cassandra-medusa

    < 0.27.1-r2

  • chainguard•py3.13-scanner-test-libraries-aiohttp

    < 0.0.1-r3

  • chainguard•request-1276

    < 0.27.1-r2

  • chainguard•text-generation-inference

    < 3.3.7-r10

  • chainguard•tritonserver-backend-vllm-cuda-12.9

    < 25.9.0_git20260318-r1

  • chainguard•tritonserver-backend-vllm-cuda-13.0

    < 25.11-r3

  • wolfi•airflow-3

    < 3.2.1-r0 | < 3.1.8-r11

  • wolfi•checkov

    < 3.2.517-r0

  • wolfi•dask-kubernetes

    < 2026.3.0-r3

  • wolfi•kserve-storage-controller

    < 0.17.0-r2

  • wolfi•kubeflow-pipelines-visualization-server

    < 2.16.0-r4

  • wolfi•open-webui

    < 0.8.12-r3

  • wolfi•py3-cassandra-medusa

    < 0.27.1-r2

  • debian•python-aiohttp

    < 3.7.4-1+deb11u2 | all | all | < 3.13.5-1

  • ubuntu•python-aiohttp

    all | all

  • PyPI•aiohttp

    < 3.13.4

References (9)