CVE-2026-34515: aio-libs aiohttp Absolute Path Traversal
CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-p998-jp59-783mPYSEC-2026-2097UBUNTU-CVE-2026-34515CGA-27v3-hjwr-ppg7CGA-2gvh-4mvq-2pjgCGA-4f42-j74x-4jcfCGA-6fvc-ppgr-9m6mCGA-6h66-xpcq-7h2mCGA-6hcw-w2jx-28w4CGA-6qvp-fjjp-x595CGA-77cj-jf5f-rfrmCGA-8ffm-8w64-8h6jCGA-97qg-jwqq-hw2gCGA-g282-3mq7-x5mrCGA-gjh5-h3ww-2227CGA-rxrv-m42f-4gx8CGA-w32w-r59c-vmq9CGA-w9mr-rjfx-gm5xCGA-x7p9-m4w7-w5w7CGA-xxm2-rvq3-5xqhCGA-2wj5-cr4m-gxcjCGA-3prj-cx6r-8wjpCGA-48vg-mhq7-rwf3CGA-57hq-8x27-wwwqCGA-582j-mh36-85p8CGA-59qv-9xc8-wg4hCGA-5cg2-g884-8v8xCGA-5fjx-fgj5-53rjCGA-5jm3-2vf7-jx5qCGA-5v4c-4j58-9hgfCGA-6r8h-64qh-hvjmCGA-77m8-xwwh-hxm4CGA-7qm5-g7gx-fc48CGA-863m-7pch-vc4jCGA-8xcp-4v8f-pvfqCGA-9r7g-gxx4-3r5wCGA-c8h7-vrfm-mm38CGA-f2fx-wrc7-r27hCGA-fgg9-q97w-ghg6CGA-fj85-f6gw-p872CGA-fmc9-wch9-c85vCGA-g3xq-7rmm-jx8wCGA-h3cg-c384-hc99CGA-hm2q-4q7r-wj83CGA-hmxf-7p8h-7j86CGA-hvhx-wmhh-75jjCGA-j4rq-mxhc-4x7fCGA-j669-x7v7-rp7qCGA-jvm8-rrv6-7g36CGA-m5v9-5vm5-3774CGA-pmx5-ch53-w55cCGA-q7wq-pwv7-433qCGA-qh2h-v893-vw2jCGA-r464-rx82-3xqhCGA-r9rq-w657-ghx8CGA-rjxf-7hxx-xm8gCGA-rmxp-8v8h-p88qCGA-v3r3-pj2x-9w9pCGA-v564-67mw-w9q5CGA-wgf4-4hq7-hv94CGA-wxx9-5wfr-rrg2CGA-x99v-vfwj-4q2hCGA-xgmq-mjrj-9j83
Published 01-04-2026Last modified 02-04-2026
Vulnerability summary
CVE-2026-34515 is a high (CVSS 7.5) Absolute Path Traversal vulnerability in aio-libs aiohttp. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.3% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.50%
0%100%
Low · +0.06 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 01-04-2026PublishedVulnerability first disclosed.
- 02-04-2026Last modifiedVulnerability information updated.
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, on Windows the static resource handler may expose information about a NTLMv2 remote path. This issue has been patched in version 3.13.4.
CVSS metrics
8 scores · 6 sources · 2 versionsMedium 6.6Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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:H/VI:N/VA:N/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:H/VI:N/VA:N/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:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:UDiffers
- NVDNIST6.6MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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
High 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.50%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
+0.06 pp
From 0.43% on 20-09-2026
20-09-202620-10-2026
EPSS score0.50%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-36Absolute Path TraversalThe product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.
- CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Affected systems
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
PyPI1 product
- aiohttp< 3.13.4
Ubuntu1 product
- python-aiohttpAll versions (No fix recorded)
6 vendors · 37 products
References
8 links- github.com/aio-libs/aiohttp/security/advisories/GHSA-p998-jp59-783mX Refsource CONFIRMWEBFIXREPORTAdvisoryPatchVendor Advisory
- github.com/aio-libs/aiohttp/commit/0ae2aa076c84573df83fc1fdc39eec0f5862fe3dX Refsource MISCWEBFIXREPORTPatch
- github.com/aio-libs/aiohttpPACKAGE