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Vulnerability details: VCID-j1s3-uv9r-3yd5
Vulnerability ID VCID-j1s3-uv9r-3yd5
Aliases CVE-2026-42779
GHSA-vf5j-865m-mq7c
Summary The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description: Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed. The fix checks if the class is present in the accepted class filter before calling Class.forName(). Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6. The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by applying the classname allowlist earlier. Affected are applications using Apache MINA that call IoBuffer.getObject(). Applications using Apache MINA are advised to upgrade.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-502 Deserialization of Untrusted Data
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42779.json
epss 0.00083 https://api.first.org/data/v1/epss?cve=CVE-2026-42779
epss 0.00083 https://api.first.org/data/v1/epss?cve=CVE-2026-42779
epss 0.00083 https://api.first.org/data/v1/epss?cve=CVE-2026-42779
epss 0.00083 https://api.first.org/data/v1/epss?cve=CVE-2026-42779
cvssv3.1 9.8 https://github.com/advisories/GHSA-8297-v2rf-2p32
generic_textual CRITICAL https://github.com/advisories/GHSA-8297-v2rf-2p32
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-vf5j-865m-mq7c
cvssv3.1 9.8 https://github.com/apache/mina
generic_textual CRITICAL https://github.com/apache/mina
cvssv3.1 9.8 https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
generic_textual CRITICAL https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
ssvc Track https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2026-42779
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2026-42779
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42779.json
https://api.first.org/data/v1/epss?cve=CVE-2026-42779
https://github.com/advisories/GHSA-8297-v2rf-2p32
https://github.com/apache/mina
https://nvd.nist.gov/vuln/detail/CVE-2026-42779
2464322 https://bugzilla.redhat.com/show_bug.cgi?id=2464322
fhlx5k91hrkgyzh7yk1nghrn3k27gxy0 https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
GHSA-vf5j-865m-mq7c https://github.com/advisories/GHSA-vf5j-865m-mq7c
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42779.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/advisories/GHSA-8297-v2rf-2p32
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/apache/mina
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-05-01T13:20:41Z/ Found at https://lists.apache.org/thread/fhlx5k91hrkgyzh7yk1nghrn3k27gxy0
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42779
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.24284
EPSS Score 0.00083
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:17.009327+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42779.json 38.6.0