CVE-2026-42504

Description

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.56%• Percentile: 45%

Techniques & Countermeasures

• CWE-407•Inefficient Algorithmic Complexity

  An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

Affected Systems

• chainguard•aactl

  < 0.4.12-r54

• chainguard•act

  < 0

• chainguard•actionlint

  < 0

• chainguard•actions-runner-controller

  < 0.14.2-r2 | < 0

• chainguard•addon-resizer

  < 1.8.23-r20

• chainguard•addon-resizer-fips

  < 1.8.23-r19

• chainguard•age-fips

  < 1.3.1-r12 | < 0

• chainguard•agentbeat

  < 9.2.7-r12

• chainguard•agentbeat-fips

  < 9.2.7-r11

• chainguard•amazon-cloudwatch-agent

  < 1.300069.0-r2

• chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard

  < 0

• chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard-fips

  < 0

• chainguard•amazon-cloudwatch-agent-config-downloader

  < 0

• chainguard•amazon-cloudwatch-agent-config-downloader-fips

  < 0

• chainguard•amazon-cloudwatch-agent-config-translator

  < 0

• chainguard•amazon-cloudwatch-agent-config-translator-fips

  < 0

• chainguard•amazon-cloudwatch-agent-fips

  < 1.300069.0-r2

• chainguard•amazon-cloudwatch-agent-operator

  < 3.5.0-r0

• chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent

  < 0

• chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent-fips

  < 0

• chainguard•amazon-ecs-agent

  < 1.103.2-r1 | < 0

• chainguard•amazon-ecs-cni-plugins-fips

  < 0 | < 2024.9.0_git20260522-r1

• chainguard•amazon-eks-ami

  < 20260527-r1 | < 0

• chainguard•amazon-k8s-cni

  < 0 | < 1.22.1-r1

• chainguard•amazon-k8s-cni-init

  < 0

• chainguard•amazon-k8s-cni-init-fips-compat

  < 0 | < 1.22.1-r2

• chainguard•amazon-vpc-cni-plugins-fips

  < 0 | < 1.3_git20260307-r3

• chainguard•ansible-operator

  < 1.42.2-r9

• chainguard•apache-exporter

  < 0

• chainguard•apisix-ingress-controller

  < 2.1.0-r1

• chainguard•apm-server-8.19

  < 0

• chainguard•apm-server-9.2

  < 0

• chainguard•apm-server-9.3

  < 0

• chainguard•argo-cd-3.0

  < 3.0.23-r6

• chainguard•argo-cd-3.0-compat

  < 3.0.23-r6

• chainguard•argo-cd-3.1

  < 3.1.16-r3

• chainguard•argo-cd-3.1-compat

  < 3.1.16-r3

• chainguard•argo-cd-3.3-compat

  < 3.3.14-r9

• chainguard•argo-cd-fips-3.0

  < 3.0.23-r7

• chainguard•argo-cd-fips-3.0-compat

  < 3.0.23-r7

• chainguard•argo-cd-fips-3.1

  < 3.1.16-r1

• chainguard•argo-cd-fips-3.1-compat

  < 3.1.16-r1

• chainguard•argo-cd-fips-3.2

  < 3.2.12-r6

• chainguard•argo-cd-fips-3.2-compat

  < 3.2.12-r6

• chainguard•argo-cd-fips-3.3

  < 3.3.11-r1

• chainguard•argo-cd-fips-3.3-compat

  < 3.3.11-r1

• chainguard•argo-cd-fips-3.4

  < 3.4.3-r1

• chainguard•argo-cd-fips-3.4-compat

  < 3.4.3-r1

• chainguard•argo-events

  < 1.9.10-r25

• chainguard•argo-events-fips

  < 1.9.10-r17

Showing first 50 affected entries in server-rendered view.

References (12)

• https://go.dev/issue/79217
• https://go.dev/cl/774481
• https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
• https://pkg.go.dev/vuln/GO-2026-5038
• https://security-tracker.debian.org/tracker/CVE-2026-42504
• https://access.redhat.com/errata/RHSA-2026:57456
• https://access.redhat.com/security/updates/classification/#important
• https://bugzilla.redhat.com/show_bug.cgi?id=2484204
• https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_57456.json
• https://access.redhat.com/security/cve/CVE-2026-42504
• https://www.cve.org/CVERecord?id=CVE-2026-42504
• https://nvd.nist.gov/vuln/detail/CVE-2026-42504