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01 Record

CVE-2026-39836

Panic in Dial and LookupPort when handling NUL byte on Windows in net

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

Panic in Dial and LookupPort when handling NUL byte on Windows in net

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
0.63% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 50.0% 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
Analyzed. NVD last modified this record on 2026-10-26.
Red Hat severity
Moderate. 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
2026-05-08 21:30Z5 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
Data version
5.2
Document digest
c8cb8e81d08751acb33dc1ca9a64a58b92eba2ba571407346d0b479066033491

05 Affected products

VendorProductVersionsPlatforms
Go standard librarynet0 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

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

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

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

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.

Ubuntu 22.04 LTS

  • 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-1.25
    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.