CVE-2026-54277: aio-libs aiohttp
CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-63hw-fmq6-xxg2PYSEC-2026-2110UBUNTU-CVE-2026-54277DEBIAN-CVE-2026-54277CGA-45v4-wm2j-jmf9CGA-4cf6-5v3v-6x6hCGA-87rq-hh5g-r2q9CGA-8gpq-58fc-f95pCGA-9x8c-55hj-6hf4CGA-cxvv-cxhf-qcv5CGA-g28p-jpj9-c7vmCGA-jcqc-87f3-php8CGA-qfx5-ggx3-cmwrCGA-v94w-3m86-pphrCGA-368f-q4jv-hgmrCGA-3c8m-wg58-c3x5CGA-3gxp-63gq-7692CGA-3j3v-7fg8-795mCGA-4cfw-4qjm-qc48CGA-4gj6-vfr9-366wCGA-4wxc-856x-2gc7CGA-5prc-jpcw-w6h8CGA-658x-2hw3-8797CGA-65p9-vfcw-w92rCGA-72fr-4827-6m9xCGA-7pmr-jgmf-cm53CGA-846x-c3w4-jrf3CGA-8c7x-x2c8-jwfpCGA-8r29-v6qp-jjf6CGA-8vv5-5ggr-3942CGA-9mx4-8wjp-qfw8CGA-c6qj-2gpq-2375CGA-c92m-w56p-4mv4CGA-fp2f-g74f-cp5gCGA-frp3-mg73-3g4qCGA-g56q-rfj9-3rmqCGA-g5m3-mfrm-7hwpCGA-gfm6-m8xc-w7c3CGA-gvcg-7rf3-28h5CGA-h635-pq7h-cx34CGA-h9wg-whrv-832rCGA-hmpm-q4fc-76h4CGA-j6c7-69qg-fh33CGA-j92f-43qp-f685CGA-m3rc-xhh8-j5xcCGA-mvxx-p4rx-7f9gCGA-pwpg-6fmh-qw3cCGA-q4gx-r5f5-qg2wCGA-qrxx-34xq-f8v6CGA-r6r7-9m8c-54mgCGA-r9cf-66gw-64pgCGA-rj44-jjvf-4g7gCGA-vc8x-39jw-5qrmCGA-vhgm-754x-hjp8CGA-vxqq-p7v4-gc6gCGA-w3q2-gp8v-32hpCGA-wvhp-vpgj-gg7rCGA-x3h7-hg54-v74gCGA-xc3f-7jwf-96x3CGA-xgp7-jmg4-w997CGA-xxw8-qvwq-95mh
Published 22-06-2026Last modified 23-06-2026
Vulnerability summary
CVE-2026-54277 is a high (CVSS 7.5) vulnerability in aio-libs aiohttp. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.9% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.56%
0%100%
Low · +0.24 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.
- 23-06-2026Last modifiedVulnerability information updated.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount 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
0.56%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.24 pp
From 0.32% on 21-09-2026
21-09-202621-10-2026
EPSS score0.56%
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-63hw-fmq6-xxg2X Refsource CONFIRMWEBAdvisoryREPORTVendor Advisory
- github.com/aio-libs/aiohttp/commit/5ab61bb4cd88f19b712f12c7c9295fe262bf804dX Refsource MISCWEBFIXPatch
- github.com/aio-libs/aiohttpPACKAGE
