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01 Record

CVE-2026-42504

Quadratic complexity in WordDecoder.DecodeHeader in mime

HighPUBLISHEDCNA: Go
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
View raw JSON

02 Description

Quadratic complexity in WordDecoder.DecodeHeader in mime

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.56% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 46.3% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-07-22.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-02 22:01Z4 MO AGO
Last updated
2026-10-29 16:23Z3 HR AGO
Reserved
2026-04-28
Assigning CNA
Go
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-407Inefficient Algorithmic ComplexityClass
  • CWE-1050Excessive Platform Resource Consumption within a LoopBase
Data version
5.2
Document digest
0b0a50da3d9667b36f1c7c2a37a8427a380b255c429e23ae9ec32619678d36e3

05 Affected products

VendorProductVersionsPlatforms
Go standard librarymime0 to < 1.25.11, 1.26.0-0 to < 1.26.4—

06 References

07 Fixed in

AlmaLinux 8

  • delve
    Fixed in 1.26.1-1.module_el8.10.0+4223+bd807c2e
  • go-toolset
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-bin
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-docs
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-misc
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-race
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-src
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-tests
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • grafana
    Fixed in 9.2.10-33.el8_10
  • grafana-pcp
    Fixed in 5.1.1-18.el8_10
  • grafana-selinux
    Fixed in 9.2.10-33.el8_10
  • osbuild-composer
    Fixed in 101.5-3.el8_10.alma.1
  • osbuild-composer-core
    Fixed in 101.5-3.el8_10.alma.1
  • osbuild-composer-worker
    Fixed in 101.5-3.el8_10.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • go-toolset
    Fixed in 1.26.4-1.el9_8
  • golang
    Fixed in 1.26.4-1.el9_8
  • golang-bin
    Fixed in 1.26.4-1.el9_8
  • golang-docs
    Fixed in 1.26.4-1.el9_8
  • golang-misc
    Fixed in 1.26.4-1.el9_8
  • golang-race
    Fixed in 1.26.4-1.el9_8
  • golang-src
    Fixed in 1.26.4-1.el9_8
  • golang-tests
    Fixed in 1.26.4-1.el9_8
  • grafana
    Fixed in 10.2.6-23.el9_8.3
  • grafana-selinux
    Fixed in 10.2.6-23.el9_8.3
  • opentelemetry-collector
    Fixed in 0.152.1-2.el9_8
  • osbuild-composer
    Fixed in 165.1-4.el9_8.1.alma.1
  • osbuild-composer-core
    Fixed in 165.1-4.el9_8.1.alma.1
  • osbuild-composer-worker
    Fixed in 165.1-4.el9_8.1.alma.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • go-fdo-client
    Fixed in 1.0.0-4.el10_2.7
  • go-toolset
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-bin
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-docs
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-misc
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-race
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-src
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-tests
    Fixed in 1.26.4-1.el10_2.alma.1
  • grafana
    Fixed in 10.2.6-28.el10_2.5
  • grafana-pcp
    Fixed in 5.3.0-8.el10_2.1
  • grafana-selinux
    Fixed in 10.2.6-28.el10_2.5
  • ipp-usb
    Fixed in 0.9.27-7.el10_2.3
  • opentelemetry-collector
    Fixed in 0.152.1-2.el10_2
  • yggdrasil
    Fixed in 0.4.9.2-1.el10_2.3
  • yggdrasil-devel
    Fixed in 0.4.9.2-1.el10_2.3

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • delve
    Fixed in 1.26.1-1.module_el8.10.0+4223+bd807c2e
  • go-toolset
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-bin
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-docs
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-misc
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-race
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-src
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • golang-tests
    Fixed in 1.26.5-1.module_el8.10.0+4223+bd807c2e
  • grafana
    Fixed in 9.2.10-33.el8_10
  • grafana-pcp
    Fixed in 5.1.1-18.el8_10
  • grafana-selinux
    Fixed in 9.2.10-33.el8_10
  • osbuild-composer
    Fixed in 101.5-3.el8_10.alma.1
  • osbuild-composer-core
    Fixed in 101.5-3.el8_10.alma.1
  • osbuild-composer-worker
    Fixed in 101.5-3.el8_10.alma.1

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • go-toolset
    Fixed in 1.26.4-1.el9_8
  • golang
    Fixed in 1.26.4-1.el9_8
  • golang-bin
    Fixed in 1.26.4-1.el9_8
  • golang-docs
    Fixed in 1.26.4-1.el9_8
  • golang-misc
    Fixed in 1.26.4-1.el9_8
  • golang-race
    Fixed in 1.26.4-1.el9_8
  • golang-src
    Fixed in 1.26.4-1.el9_8
  • golang-tests
    Fixed in 1.26.4-1.el9_8
  • grafana
    Fixed in 10.2.6-23.el9_8.3
  • grafana-selinux
    Fixed in 10.2.6-23.el9_8.3
  • opentelemetry-collector
    Fixed in 0.152.1-2.el9_8
  • osbuild-composer
    Fixed in 165.1-4.el9_8.1.alma.1
  • osbuild-composer-core
    Fixed in 165.1-4.el9_8.1.alma.1
  • osbuild-composer-worker
    Fixed in 165.1-4.el9_8.1.alma.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • go-fdo-client
    Fixed in 1.0.0-4.el10_2.7
  • go-toolset
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-bin
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-docs
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-misc
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-race
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-src
    Fixed in 1.26.4-1.el10_2.alma.1
  • golang-tests
    Fixed in 1.26.4-1.el10_2.alma.1
  • grafana
    Fixed in 10.2.6-28.el10_2.5
  • grafana-pcp
    Fixed in 5.3.0-8.el10_2.1
  • grafana-selinux
    Fixed in 10.2.6-28.el10_2.5
  • ipp-usb
    Fixed in 0.9.27-7.el10_2.3
  • opentelemetry-collector
    Fixed in 0.152.1-2.el10_2
  • yggdrasil
    Fixed in 0.4.9.2-1.el10_2.3
  • yggdrasil-devel
    Fixed in 0.4.9.2-1.el10_2.3

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • golang-1.19
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • golang-1.24
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • golang-1.26
    Fixed in 1.26.4-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • golang-1.24
    No fix yet
  • golang-1.25
    No fix yet
  • golang-1.26
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • golang-1.26
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.