CVE-2026-54273: aio-libs aiohttp
CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-4fvr-rgm6-gqmcPYSEC-2026-2107UBUNTU-CVE-2026-54273DEBIAN-CVE-2026-54273CGA-32ph-w8jf-jfhmCGA-3cw9-2cr9-jgh6CGA-43wr-4c98-vfg7CGA-75v6-rxvj-q9m5CGA-g4r5-3mm4-p2v2CGA-g7w6-w4h9-78mmCGA-mw94-v6x9-ff5cCGA-pchv-cr78-9v3fCGA-rqw3-7vmr-8g6gCGA-vhw5-2q45-vvffCGA-2r4q-4gp4-x36hCGA-2xcx-45x7-x5fgCGA-36h9-fvvm-xr7fCGA-37wg-q4gr-gq2jCGA-3c59-cp8p-gc9qCGA-4484-wx7g-r22hCGA-46mx-mjmx-462fCGA-52f7-m92f-9w4rCGA-5hgx-6ff9-5fggCGA-5r4p-564x-xcxjCGA-7p7c-xfc6-qqp6CGA-7vrv-5pvr-4hwgCGA-8jvm-jqhg-vxc8CGA-98pq-7wp5-w77jCGA-9cff-q7vq-rg4cCGA-9jc8-9275-9v9wCGA-9vg7-rpc3-rr5rCGA-c94f-69jh-7x64CGA-f3ww-hhcx-4r4vCGA-f4r2-5jhv-7frhCGA-fg4j-w6cm-85cvCGA-fh79-2hhm-2jf9CGA-gjg4-5q9j-vqfrCGA-gv24-gxpx-rhw2CGA-h3q4-r3f8-crhqCGA-hccw-xp36-qjmcCGA-hhwm-8x83-xmc2CGA-hxfq-wxh9-88wwCGA-jjfg-wjw2-7c59CGA-jvjm-mpwq-gjf7CGA-mmx9-q73g-p64gCGA-mw79-cqr2-jhxfCGA-pqwg-w9r9-mgffCGA-qjr6-jpwp-x737CGA-rgg3-gmvr-pq82CGA-v43w-4cgf-hg7wCGA-v78j-xw2h-9c29CGA-v978-rwjw-p6r2CGA-v9gj-2cp9-x7v6CGA-w2cf-q4h2-83w3CGA-w652-x8c8-pgvgCGA-w7pg-r26v-69vqCGA-wjfj-4gvx-mhw7CGA-wqg4-f668-8294CGA-wqr4-h98p-937pCGA-x4q9-2wpm-h8xqCGA-xg3x-54rp-6fg9
Published 22-06-2026Last modified 22-06-2026
Vulnerability summary
CVE-2026-54273 is a high (CVSS 7.5) vulnerability in aio-libs aiohttp. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 41.1% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.49%
0%100%
Low · +0.21 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 6Timeline
- 22-06-2026PublishedVulnerability first disclosed.
- 22-06-2026Last modifiedVulnerability information updated.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.
CVSS metrics
9 scores · 7 sources · 2 versionsMedium 6.6Preferred score · CVE.org (CNA)
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:USources5 sources · 6.6–8.7
- OSV · UbuntuEcosystem advisory · calculated8.7HighCVSS: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:UDiffers
- OSV · WolfiEcosystem advisory · calculated8.7HighCVSS: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:UDiffers
- OSV · ChainguardEcosystem advisory · calculated8.7HighCVSS: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:UDiffers
- NVDNIST6.6MediumCVSS: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
High 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.49%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
+0.21 pp
From 0.28% on 20-09-2026
20-09-202620-10-2026
EPSS score0.49%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard31 products
- airflow-2All versions (No fix recorded)
- airflow-3< 3.3.1-r0 | < 3.2.2-r7
- airflow-3-iamguarded-compatAll versions (No fix recorded)
- airflow-core-2< 2.11.2-r6
- apache-beam-python-3.11-sdk< 2.74.0-r3
Wolfi4 products
- airflow-3< 3.3.1-r0 | < 3.2.2-r7
- airflow-3-iamguarded-compatAll versions (No fix recorded)
- mlflow< 3.16.0-r0 | < 3.13.0-r1
- open-webui< 0.9.6-r5
Aio-libs1 product
- aiohttp< 3.14.1
Aiohttp1 product
- aiohttp< 3.14.1
Debian1 product
- python-aiohttpAll versions (No fix recorded) | < 3.14.1-1
PyPI1 product
- aiohttp< 3.14.1
Ubuntu1 product
- python-aiohttpAll versions (No fix recorded)
7 vendors · 40 products
References
8 links- github.com/aio-libs/aiohttp/security/advisories/GHSA-4fvr-rgm6-gqmcX Refsource CONFIRMWEBAdvisoryREPORTThird Party Advisory
- github.com/aio-libs/aiohttp/commit/dfdfa9d5aad5d21f91c79fb2ceeba0f8046cb6cfX Refsource MISCWEBFIXPatch
- github.com/aio-libs/aiohttpPACKAGE
