CVE-2023-49081

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.9%, top 45% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
—
EPSS
55.4%
KEV
Not listed

Published

November 30, 2023

Last Modified

June 23, 2026

Advisory Details (6)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
generic

[SECURITY] Fedora 39 Update: python-pysqueezebox-0.5.5-11.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSYWMP64ZFCTC3VO6RY6EC6VSSMV6I3A/
generic Patch Available🟡 PoC Available

[SECURITY] [DLA 4041-1] python-aiohttp security update

https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
github Patch Available🟡 PoC Available

ClientSession is vulnerable to CRLF injection via version · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-q3qx-c6g2-7pw2
github_pr

Disallow arbitrary sequence types in version

Fix merged in aio-libs/aiohttp PR #7835 on 2023-11-13 — awaiting tagged release

https://github.com/aio-libs/aiohttp/pull/7835/files
github_commit

commit 1e86b777e61c (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit 1e86b777e61c — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/1e86b777e61cf4eefc7d92fa57fa19dcc676013b
generic

aiohttp CRLF injection via Version · GitHub

https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-aiohttp (3.9.1-1ubuntu0.1+esm1) @ noble2026-05-24ubuntu
redhatpython-aiohttp-0:3.9.2-1.el8pc2024-04-23redhat
redhatpython-aiohttp-0:3.9.2-1.el8ui2024-04-18redhat
redhatpython-aiohttp-0:3.9.2-0.1.el8pc2024-03-27redhat
redhatpython-aiohttp-0:3.9.1-1.el9ap2024-02-29redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
aiohttp0.1 ... 3.9.0rc0 (224 versions)3.9.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-22 23:14 UTCEG score recompute▼ 1.90
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  24. 2026-06-23 19:32 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-49081?
CVE-2023-49081 is a medium vulnerability published on November 30, 2023. aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the…
When was CVE-2023-49081 disclosed?
CVE-2023-49081 was first published in the National Vulnerability Database on November 30, 2023, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-49081 actively exploited?
CVE-2023-49081 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 55.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-49081?
CVE-2023-49081 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-49081?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-49081, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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