Vulnerability · Published Jun 2, 2026 · Assigned by Go
CVE-2026-42507Arbitrary inputs are included in errors without any escaping in net/textproto
Medium 5.3
In plain English
A medium-severity security flaw in net/textproto from Go standard library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 68.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | delve | 1.26.1-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | git-lfs | 3.7.1-4.el9_8.3 | ALSA-2026:66364 |
| AlmaLinux:10 | go-toolset | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | go-toolset | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | go-toolset | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-bin | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-bin | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-bin | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-docs | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-docs | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-docs | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-misc | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-misc | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-misc | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-race | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-race | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-race | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-src | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-src | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-src | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| AlmaLinux:10 | golang-tests | 1.26.4-1.el10_2.alma.1 | ALSA-2026:29980 |
| AlmaLinux:8 | golang-tests | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-tests | 1.26.4-1.el9_8 | ALSA-2026:29981 |
| Alpine:v3.24 | go | 1.26.8-r0 | ALPINE-CVE-2026-42507 |
| Debian:12 | golang-1.19 | no fix listed | DEBIAN-CVE-2026-42507 |
| Debian:13 | golang-1.24 | no fix listed | DEBIAN-CVE-2026-42507 |
| Debian:14 | golang-1.26 | 1.26.4-1 | DEBIAN-CVE-2026-42507 |
| Go | stdlib | 1.25.11, 1.26.4 | GO-2026-5039 |
| Rocky Linux:10 | golang | 0:1.26.4-1.el10_2 | RLSA-2026:29980 |
| Rocky Linux:9 | golang | 0:1.26.4-1.el9_8 | RLSA-2026:29981 |
| Ubuntu:22.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:24.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:25.10 | golang-1.24 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:26.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:22.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:24.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:25.10 | golang-1.25 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:26.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:22.04:LTS | golang-1.26 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:24.04:LTS | golang-1.26 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:26.04:LTS | golang-1.26 | no fix listed | UBUNTU-CVE-2026-42507 |
| Ubuntu:26.10 | golang-1.26 | no fix listed | UBUNTU-CVE-2026-42507 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | net/textproto | 0 – before 1.25.111.26.0-0 – before 1.26.4 |