CVE-2026-59881

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). 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, secondary
Trending — Patch released this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.9Exploit: 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 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100CISA SSVC

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
Severity69% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 30, 2026

Last Modified

July 30, 2026

Advisory Details (3)

Auto-updated Jul 30, 2026
Patch available. Sources: github, github_pr, github_commit.
github_commit

commit 47fb6ae354d4 (aio-libs/aiohttp)

Fix landed in aio-libs/aiohttp commit 47fb6ae354d4 — awaiting tagged release

https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6
github_pr

Fix decompressing frames without negotiation (#12976)

Fix merged in aio-libs/aiohttp PR #12978 on 2026-06-23 — awaiting tagged release

https://github.com/aio-libs/aiohttp/pull/12978
github Patch Available

WebSocket client accepts compressed frames without negotiated permessage-deflate · Advisory · aio-libs/aiohttp · GitHub

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7

Vendor Advisories for CVE-2026-59881(8)

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

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhaiis/vllm-cuda-rhel9:17906217182026-09-30redhat
redhatrhaiis/vllm-rocm-rhel9:17906217132026-09-30redhat
redhatrhaiis/model-opt-cuda-rhel9:17906217142026-09-30redhat
redhatrhaii/vllm-cpu-rhel9:17900757932026-09-23redhat
redhatrhaii/vllm-spyre-rhel9:17900761412026-09-23redhat
redhatrhaii/vllm-cuda-rhel9:17900901312026-09-23redhat
redhatrhaii/vllm-rocm-rhel9:17901096202026-09-23redhat

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

(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 ... 3.14.1-5 (14 versions)
  • every version up to 3.14.3-1: fixed in 3.14.3-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
aiohttp0.1 ... 3.9.5 (308 versions)
  • every version up to 3.14.2: fixed in 3.14.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× 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 115 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-59881?
CVE-2026-59881 is a medium vulnerability published on July 30, 2026. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory…
When was CVE-2026-59881 disclosed?
CVE-2026-59881 was first published on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59881 actively exploited?
CVE-2026-59881 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59881?
CVE-2026-59881 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59881?
A fix for CVE-2026-59881 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59881 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59881

Explore →

Is Your Infrastructure Affected by CVE-2026-59881?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs