synced 5 MIN AGO
01 Record

CVE-2026-39820

Quadratic string concatentation in consumeComment in net/mail

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 string concatentation in consumeComment in net/mail

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
0.78% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 55.5% 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
Modified. NVD last modified this record on 2026-10-26.
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
2026-05-07 19:41Z5 MO AGO
Last updated
2026-09-18 12:04Z1 MO AGO
Reserved
2026-04-07
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-770Allocation of Resources Without Limits or ThrottlingBase
  • CWE-606Unchecked Input for Loop ConditionBase
Data version
5.2
Document digest
e27d078da30026570f5d1559a3205752342dad1e17d8b781fc97ee4c398a8867

05 Affected products

VendorProductVersionsPlatforms
Go standard librarynet/mail0 to < 1.25.10, 1.26.0-0 to < 1.26.3—

06 References

07 Fixed in

AlmaLinux 8

  • delve
    Fixed in 1.25.2-1.module_el8.10.0+4074+24330916
  • go-toolset
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-bin
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-docs
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-misc
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-race
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-src
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-tests
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • grafana
    Fixed in 9.2.10-33.el8_10
  • grafana-selinux
    Fixed in 9.2.10-33.el8_10
  • osbuild-composer
    Fixed in 101.5-2.el8_10.alma.1
  • osbuild-composer-core
    Fixed in 101.5-2.el8_10.alma.1
  • osbuild-composer-worker
    Fixed in 101.5-2.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 1.26.3-1.el9_8
  • golang
    Fixed in 1.26.3-1.el9_8
  • golang-bin
    Fixed in 1.26.3-1.el9_8
  • golang-docs
    Fixed in 1.26.3-1.el9_8
  • golang-misc
    Fixed in 1.26.3-1.el9_8
  • golang-race
    Fixed in 1.26.3-1.el9_8
  • golang-src
    Fixed in 1.26.3-1.el9_8
  • golang-tests
    Fixed in 1.26.3-1.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

  • grafana
    Fixed in 10.2.6-28.el10_2.5
  • grafana-selinux
    Fixed in 10.2.6-28.el10_2.5
  • opentelemetry-collector
    Fixed in 0.152.1-2.el10_2

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 1.25.2-1.module_el8.10.0+4074+24330916
  • go-toolset
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-bin
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-docs
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-misc
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-race
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-src
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • golang-tests
    Fixed in 1.25.10-1.module_el8.10.0+4187+c45165c4
  • grafana
    Fixed in 9.2.10-33.el8_10
  • grafana-selinux
    Fixed in 9.2.10-33.el8_10
  • osbuild-composer
    Fixed in 101.5-2.el8_10.alma.1
  • osbuild-composer-core
    Fixed in 101.5-2.el8_10.alma.1
  • osbuild-composer-worker
    Fixed in 101.5-2.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 1.26.3-1.el9_8
  • golang
    Fixed in 1.26.3-1.el9_8
  • golang-bin
    Fixed in 1.26.3-1.el9_8
  • golang-docs
    Fixed in 1.26.3-1.el9_8
  • golang-misc
    Fixed in 1.26.3-1.el9_8
  • golang-race
    Fixed in 1.26.3-1.el9_8
  • golang-src
    Fixed in 1.26.3-1.el9_8
  • golang-tests
    Fixed in 1.26.3-1.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

  • grafana
    Fixed in 10.2.6-28.el10_2.5
  • grafana-selinux
    Fixed in 10.2.6-28.el10_2.5
  • opentelemetry-collector
    Fixed in 0.152.1-2.el10_2

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 1.26.3-1

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

Ubuntu 14.04 LTS

  • golang-1.10
    No fix yet

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

Ubuntu 16.04 LTS

  • golang-1.10
    No fix yet
  • golang-1.6
    No fix yet

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

Ubuntu 18.04 LTS

  • golang-1.10
    No fix yet
  • golang-1.8
    No fix yet
  • golang-1.9
    No fix yet

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

Ubuntu 20.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.14
    No fix yet
  • golang-1.18
    No fix yet
  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet

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

Ubuntu 22.04 LTS

  • golang-1.17
    No fix yet
  • golang-1.18
    No fix yet
  • golang-1.20
    No fix yet
  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet
  • golang-1.23
    No fix yet
  • 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 24.04 LTS

  • golang-1.21
    No fix yet
  • golang-1.22
    No fix yet
  • golang-1.23
    No fix yet
  • 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 25.10

  • golang-1.23
    No fix yet
  • 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-1.23
    No fix yet
  • 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 Pro 16.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.18
    No fix yet

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

Ubuntu Pro 18.04 LTS

  • golang-1.13
    No fix yet
  • golang-1.16
    No fix yet
  • golang-1.18
    No fix yet

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

Ubuntu Pro 20.04 LTS

  • golang-1.16
    No fix yet

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

Ubuntu Pro 22.04 LTS

  • golang-1.13
    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.