CVE-2026-34514

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

April 1, 2026

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit, github.
github Patch Available

CRLF injection in multipart part content type header construction · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2vrm-gr82-f7m5
github_commit

commit 9a6ada97e2c6 (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit 9a6ada97e2c6 — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/9a6ada97e2c6cf1ce31727c6c9fcea17c21f6f06

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.7.4-1, 3.7.4-1+deb11u13.7.4-1+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.10.0-1 ... 3.9.5-1 (33 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.11.16-1 ... 3.14.1-5 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-aiohttp3.11.16-1 ... 3.13.3-3 (7 versions)3.13.5-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
aiohttp0.1 ... 3.9.5 (304 versions)3.13.4—

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 7× in last 7d / 30× 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 162 total refreshes for this CVE.

  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-12 15:01 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-02 11:44 UTCOSV refresh
  13. 2026-09-01 13:53 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 17:03 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 09:28 UTCEG score recompute
  5. 2026-08-16 09:28 UTCVendor advisory
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-14 05:54 UTCEG score recompute
  9. 2026-08-14 05:54 UTCVendor advisory
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-12 20:11 UTCEG score recompute
  12. 2026-08-12 20:11 UTCVendor advisory
  13. 2026-08-12 13:50 UTCEPSS rescore
  14. 2026-08-11 08:16 UTCEG score recompute
  15. 2026-08-11 08:16 UTCVendor advisory
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 06:52 UTCEG score recompute
  18. 2026-08-10 06:52 UTCVendor advisory
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-09 05:27 UTCEG score recompute
  21. 2026-08-09 05:27 UTCVendor advisory
  22. 2026-08-07 15:34 UTCEG score recompute
  23. 2026-08-07 15:34 UTCVendor advisory
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-06 00:28 UTCEG score recompute
  26. 2026-08-06 00:28 UTCVendor advisory
  27. 2026-08-05 19:17 UTCEPSS rescore
  28. 2026-08-04 15:10 UTCEPSS rescore
  29. 2026-08-04 10:38 UTCEPSS rescore
  30. 2026-08-03 22:48 UTCEG score recompute
  31. 2026-08-03 22:48 UTCVendor advisory
  32. 2026-08-03 10:36 UTCEPSS rescore
  33. 2026-08-02 14:46 UTCEG score recompute
  34. 2026-08-02 14:46 UTCVendor advisory
  35. 2026-08-02 02:27 UTCEPSS rescore
  36. 2026-08-01 04:16 UTCEPSS rescore
  37. 2026-07-30 16:28 UTCEPSS rescore
  38. 2026-07-30 01:30 UTCEPSS rescore
  39. 2026-07-27 14:13 UTCEPSS rescore
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-26 14:54 UTCEPSS rescore
  42. 2026-07-25 14:18 UTCEPSS rescore
  43. 2026-07-25 14:18 UTCEPSS rescore
  44. 2026-07-24 14:17 UTCEPSS rescore
  45. 2026-07-24 14:17 UTCEPSS rescore
  46. 2026-07-23 14:18 UTCEPSS rescore
  47. 2026-07-23 14:18 UTCEPSS rescore
  48. 2026-07-23 03:09 UTCEG score recompute
  49. 2026-07-22 14:08 UTCEPSS rescore
  50. 2026-07-21 15:24 UTCEPSS rescore
  51. 2026-07-20 17:08 UTCEPSS rescore
  52. 2026-07-19 02:29 UTCEPSS rescore
  53. 2026-07-18 10:04 UTCEPSS rescore
  54. 2026-07-17 03:54 UTCOSV refresh
  55. 2026-07-16 17:03 UTCEPSS rescore
  56. 2026-07-15 16:57 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 02:00 UTCEPSS rescore
  59. 2026-07-13 22:30 UTCEPSS rescore
  60. 2026-07-13 06:13 UTCEPSS rescore
  61. 2026-07-13 06:13 UTCEPSS rescore
  62. 2026-07-12 05:46 UTCEPSS rescore
  63. 2026-07-11 08:27 UTCEPSS rescore
  64. 2026-07-09 19:10 UTCEPSS rescore
  65. 2026-07-08 15:15 UTCEPSS rescore
  66. 2026-07-06 16:27 UTCEPSS rescore
  67. 2026-07-06 16:27 UTCEPSS rescore
  68. 2026-07-06 02:23 UTCEPSS rescore
  69. 2026-07-06 02:23 UTCEPSS rescore
  70. 2026-07-05 02:30 UTCEPSS rescore
  71. 2026-07-04 06:31 UTCEPSS rescore
  72. 2026-07-01 15:06 UTCEPSS rescore
  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-28 14:07 UTCEPSS rescore
  75. 2026-06-28 14:07 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34514?
CVE-2026-34514 is a medium vulnerability published on April 1, 2026. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the content_type parameter in aiohttp could use this to inject extra headers or similar exploits. This issue has been patched in version 3.13.4.
When was CVE-2026-34514 disclosed?
CVE-2026-34514 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34514 actively exploited?
CVE-2026-34514 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.7% of all scored CVEs.
What is the CVSS score of CVE-2026-34514?
CVE-2026-34514 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-34514?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34514, 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.

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