CVE-2026-54273

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • 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, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. 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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 15, 2026

Last Modified

June 26, 2026

Advisory Details (2)

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

HTTP/1 Pipelined Requests Queue Without Limit · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4fvr-rgm6-gqmc
GitHub commit

commit dfdfa9d5aad5 (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit dfdfa9d5aad5 — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/dfdfa9d5aad5d21f91c79fb2ceeba0f8046cb6cf

Vendor Advisories for CVE-2026-54273(1)

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

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-aiohttp3.10.0-1 ... 3.9.5-1 (41 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-aiohttp3.10.0-1 ... 3.9.5-1 (34 versions)
  • every version on: no fix on record
—
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 11× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 149 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 49 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 15:56 UTCEG score recompute
  3. 2026-10-11 19:39 UTCEG score recompute
  4. 2026-10-11 16:55 UTCEG score recompute
  5. 2026-10-11 14:18 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-03 07:39 UTCOSV refresh
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
Show 75 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-09-14 03:41 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-08-30 22:58 UTCEG score recompute
  17. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-08-24 23:33 UTCEG score recompute
  24. 2026-08-23 09:44 UTCEG score recompute
  25. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-08-21 10:27 UTCEG score recompute
  28. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-08-20 08:41 UTCEG score recompute
  30. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  31. 2026-08-19 13:14 UTCEG score recompute
  32. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-08-17 15:57 UTCEG score recompute
  34. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-08-17 03:07 UTCEG score recompute
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  37. 2026-08-16 14:16 UTCEG score recompute
  38. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  39. 2026-08-15 12:35 UTCEG score recompute
  40. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-08-13 22:03 UTCEG score recompute
  42. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  43. 2026-08-12 19:34 UTCEG score recompute
  44. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  45. 2026-08-11 16:54 UTCEG score recompute
  46. 2026-08-11 04:04 UTCEG score recompute
  47. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-08-10 02:22 UTCEG score recompute
  49. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  50. 2026-08-07 23:01 UTCEG score recompute
  51. 2026-08-06 21:21 UTCEG score recompute
  52. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  53. 2026-08-05 19:41 UTCEG score recompute
  54. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-08-04 16:24 UTCEG score recompute
  56. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  57. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  58. 2026-08-03 14:44 UTCEG score recompute
  59. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  60. 2026-08-02 10:34 UTCEG score recompute
  61. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  62. 2026-08-01 08:50 UTCEG score recompute
  63. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  64. 2026-07-30 23:54 UTCEG score recompute
  65. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  66. 2026-07-30 05:11 UTCEG score recompute
  67. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  68. 2026-07-29 03:24 UTCEG score recompute
  69. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  70. 2026-07-28 01:53 UTCEG score recompute
  71. 2026-07-26 20:12 UTCEG score recompute
  72. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  73. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  74. 2026-07-24 14:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  75. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-54273?
CVE-2026-54273 is a high-severity vulnerability; its CVE record was published on June 15, 2026. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. This…
When was the CVE record for CVE-2026-54273 published?
The CVE record for CVE-2026-54273 was published on June 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 26, 2026; the record at its source may have been updated since.
Is CVE-2026-54273 actively exploited?
CVE-2026-54273 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-2026-54273?
CVE-2026-54273 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-54273?
A fix for CVE-2026-54273 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54273 are linked in the Vendor Advisories panel on this page.

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