CVE-2026-35091

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-04-01. a secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity82% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

April 1, 2026

Last Modified

August 21, 2026

Advisory Details (5)

Auto-updated May 5, 2026
Patch available. Sources: redhat.
redhat Patch Available

2453813 – (CVE-2026-35091) CVE-2026-35091 corosync: Corosync: Denial of Service and information disclosure via crafted UDP packet

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2453813
redhat Patch Available

2453169 – corosync: pre-auth OOB read in check_memb_commit_token_sanity + integer overflow in check_memb_join_sanity

https://bugzilla.redhat.com/show_bug.cgi?id=2453169
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-35091
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:13657
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:13644

Vendor Advisories for CVE-2026-35091(15)

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

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibvotequorum8 (3.1.9-2ubuntu1.1) @ questing2026-08-21ubuntu
redhatcorosync-0:2.4.5-7.el7_9.32026-05-26redhat
redhatcorosync-0:3.1.10-1.el9_8.12026-05-19redhat
redhatcorosync-0:3.1.10-1.el10_2.12026-05-19redhat
redhatcorosync-0:3.1.7-1.el9_2.12026-05-06redhat
redhatcorosync-0:3.1.9-2.el9_6.12026-05-06redhat
redhatcorosync-0:3.1.0-3.el8_4.22026-05-06redhat
redhatcorosync-0:3.1.9-1.el10_0.22026-05-06redhat
redhatcorosync-0:3.1.7-1.el8_8.12026-05-06redhat
redhatcorosync-0:3.1.5-3.el9_0.12026-05-06redhat
redhatcorosync-0:3.1.5-2.el8_6.12026-05-06redhat
redhatcorosync-0:3.1.8-1.el9_4.12026-05-06redhat
redhatcorosync-0:3.1.9-2.el9_7.12026-05-05redhat
redhatcorosync-0:3.1.8-1.el8_10.12026-05-05redhat
redhatcorosync-0:3.1.9-2.el10_1.12026-05-05redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
corosync3.1.2-2, 3.1.2-2+deb11u13.1.2-2+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
corosync3.1.7-1, 3.1.7-1+deb12u13.1.7-1+deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
corosync3.1.9-23.1.9-2+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
corosync3.1.10-1, 3.1.9-23.1.10-2—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 75× 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 195 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-35091?
CVE-2026-35091 is a high vulnerability published on April 1, 2026. A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service…
When was CVE-2026-35091 disclosed?
CVE-2026-35091 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-35091 actively exploited?
CVE-2026-35091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 44.0% of all scored CVEs.
What is the CVSS score of CVE-2026-35091?
CVE-2026-35091 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-35091?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35091, 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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