CVE-2026-22815: AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers
Analyzed
AliasesGHSA-w2fm-2cpv-w7v5PYSEC-2026-2094UBUNTU-CVE-2026-22815DEBIAN-CVE-2026-22815CGA-2q35-wq3m-rq5vCGA-3f3r-qhrj-5x2fCGA-6qv9-h586-g6m3CGA-7252-q2f6-pmcfCGA-76pg-6mr5-786pCGA-7j4f-4854-9qrrCGA-7p46-hv76-r5ggCGA-8fw4-685c-rfxpCGA-8h2g-m64v-r552CGA-8jqq-5c5r-mcp5CGA-8w49-jmh7-h2rvCGA-947p-cgwf-jrqjCGA-96qf-gxq7-m5hgCGA-cgvv-wgm7-hm37CGA-h467-rp4j-cvv6CGA-j522-cx7v-9hmpCGA-j7gc-hxpq-xgrgCGA-3522-jg24-78cwCGA-3h96-27qc-4wfxCGA-4q8w-r563-55m4CGA-6mx2-vcpc-pqc8CGA-6r79-3966-vf3rCGA-6v8w-cj7h-rh82CGA-8g36-gw25-88cwCGA-8w37-7w6r-j6rmCGA-8w3f-9x3r-p43vCGA-f4qx-w9hc-gp8hCGA-f5xv-3rwh-h673CGA-f6rv-qj3g-m3r6CGA-fg96-qwgg-9q7jCGA-fm76-r32f-p638CGA-g56r-gx7w-2jh4CGA-gpwh-f74w-g7j3CGA-h2j4-m22r-9qpjCGA-h87v-r6v6-5332CGA-hw4f-fg5f-gcffCGA-j3pw-jfm9-596xCGA-j8g3-cwwg-qj6jCGA-jhg7-4hvg-82w3CGA-jm77-hqv7-ff38CGA-m8pr-8rpq-rvvcCGA-mfgr-5fg6-3pw6CGA-mg3c-j377-mr4mCGA-mh9p-rwwv-34gcCGA-p6r5-qmrx-fc52CGA-pj45-6c92-whw6CGA-pw43-gg5p-3fjxCGA-q262-vv36-vqgxCGA-qmgc-47j3-cwc8CGA-qmgq-8g2f-hrhcCGA-rc54-39gm-xxqpCGA-rg2f-hmxp-rf53CGA-vpr9-6h6j-4rj5CGA-vqmv-vw5x-vgrqCGA-w27h-3vxw-xwwgCGA-wfq7-rpxh-wg5cCGA-x42r-xhx7-9937CGA-x4j4-5qvc-qc6jCGA-x926-9vq4-c67vCGA-xh92-xvqq-4x6pALPINE-CVE-2026-22815
Published 01-04-2026Last modified 04-04-2026
Vulnerability summary
CVE-2026-22815 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in aio-libs aiohttp. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.7% of scored vulnerabilities.
Priority
Routine
Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.46%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 6Timeline
- 01-04-2026PublishedVulnerability first disclosed.
- 04-04-2026Last modifiedVulnerability information updated.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.
CVSS metrics
11 scores · 8 sources · 2 versionsMedium 6.9Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NSourcesAll 8 agree
- OSV · PypiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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
- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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
- OSV · WolfiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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
- OSV · AlpineEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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 · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 0.44% on 04-10-2026
04-10-202603-11-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Affected systems
Version check
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard26 products
- airflow-2< 2.11.2-r5
- airflow-3< 3.2.1-r0 | < 3.1.8-r11
- airflow-core-2< 2.11.2-r3
- authentik-2025.12< 2025.12.4-r3
- authentik-2026.2< 2026.2.1-r3
Wolfi7 products
- airflow-3< 3.2.1-r0 | < 3.1.8-r11
- checkov< 3.2.517-r0
- dask-kubernetes< 2026.3.0-r3
- kserve-storage-controller< 0.17.0-r2
- kubeflow-pipelines-visualization-server< 2.16.0-r4
Aio-libs1 product
- aiohttp< 3.13.4
Aiohttp1 product
- aiohttp< 3.13.4
Alpine1 product
- py3-aiohttp< 3.13.5-r0
Debian1 product
- python-aiohttpAll versions (No fix recorded) | < 3.8.4-1+deb12u2 | < 3.13.5-1
PyPI1 product
- aiohttp< 3.13.4
Ubuntu1 product
- python-aiohttp< 0.20.2-1ubuntu0.1~esm1 | < 3.0.1-1ubuntu0.1~esm7 | < 3.8.1-4ubuntu0.2+esm3 | < 3.9.1-1ubuntu0.1+esm3 | All versions (No fix recorded) | < 3.13.3-3ubuntu1+esm1
8 vendors · 39 products
References
11 links- github.com/aio-libs/aiohttp/security/advisories/GHSA-w2fm-2cpv-w7v5X Refsource CONFIRMWEBFIXREPORTAdvisoryPatchVendor Advisory
- github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36X Refsource MISCWEBFIXREPORTPatch
- github.com/aio-libs/aiohttpPACKAGE
