CVE-2026-54278

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case). This vulnerability is fixed in 3.14.1.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

Published

June 15, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
Patch available. Sources: github_commit, github.
githubMentions a patch (unverified)

Unread Compressed Request Bodies Bypass client_max_size During Cleanup · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g3cq-j2xw-wf74
github_commit

commit 4f7480e474cc (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit 4f7480e474cc — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/4f7480e474cccc6a8cc2c92ad3f17a31dedf8232

Vendor Advisories for CVE-2026-54278(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-aiohttp3.11.16-1 ... 3.14.3-1 (16 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-aiohttp3.11.16-1 ... 3.14.0-1 (9 versions)
  • every version up to 3.14.1-1: fixed in 3.14.1-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
aiohttp0.1 ... 3.9.5 (307 versions)
  • every version up to 3.14.1: fixed in 3.14.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 26× 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 142 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-54278?
CVE-2026-54278 is a high vulnerability published on June 15, 2026. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. An attacker may be able to send a compressed payload in specific situations that could be…
When was CVE-2026-54278 disclosed?
CVE-2026-54278 was first published on June 15, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54278 actively exploited?
CVE-2026-54278 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54278?
CVE-2026-54278 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-54278?
A fix for CVE-2026-54278 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54278 are linked in the Vendor Advisories panel on this page.

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