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Noroxi
NVD / CVE Program· CNA Go

CVE-2026-42507: Arbitrary inputs are included in errors without any escaping in net/textproto

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.37% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Go standard library net/textproto 1.25.11, 1.26.4; azl3 golang 1.26.3-1 on Azure Linux 3.0 1.26.4-1; azl3 golang 1.26.4-3 on Azure Linux 3.0 1.26.4-1.

Low priority for now. Upgrade to Go standard library net/textproto 1.25.11, 1.26.4; azl3 golang 1.26.3-1 on Azure Linux 3.0 1.26.4-1; azl3 golang 1.26.4-3 on Azure Linux 3.0 1.26.4-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Jun 2, 2026
Updated
Jul 22, 2026
EPSS
0.3% · 31th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-42507

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

  • Go standard library net/textproto

    • before 1.25.11affected · semver
    • 1.26.0-0 and later · before 1.26.4affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10go-toolsetbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golangbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-binbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-docsbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-miscbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-racebefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-srcbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:10golang-testsbefore 1.26.4-1.el10_2.alma.11.26.4-1.el10_2.alma.1
AlmaLinux:8delvebefore 1.26.1-1.module_el8.10.0+4223+bd807c2e1.26.1-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8go-toolsetbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golangbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-binbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-docsbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-miscbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-racebefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-srcbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:8golang-testsbefore 1.26.5-1.module_el8.10.0+4223+bd807c2e1.26.5-1.module_el8.10.0+4223+bd807c2e
AlmaLinux:9git-lfsbefore 3.7.1-4.el9_8.33.7.1-4.el9_8.3
AlmaLinux:9go-toolsetbefore 1.26.4-1.el9_81.26.4-1.el9_8
AlmaLinux:9golangbefore 1.26.4-1.el9_81.26.4-1.el9_8
AlmaLinux:9golang-binbefore 1.26.4-1.el9_81.26.4-1.el9_8
AlmaLinux:9golang-docsbefore 1.26.4-1.el9_81.26.4-1.el9_8
AlmaLinux:9golang-miscbefore 1.26.4-1.el9_81.26.4-1.el9_8
AlmaLinux:9golang-racebefore 1.26.4-1.el9_81.26.4-1.el9_8

+96

Same product

go standard library: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-94440Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
    30Monitor
  • CVE-2023-45290Memory exhaustion in multipart form parsing in net/textproto and net/http
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go standard library net/textproto1.25.11Vendor (CNA)
Go standard library net/textproto1.26.4Vendor (CNA)
azl3 golang 1.26.3-1 on Azure Linux 3.01.26.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 golang 1.26.4-3 on Azure Linux 3.01.26.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 golang 1.26.5-2 on Azure Linux 3.01.26.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 golang 1.27.0-1 on Azure Linux 3.0—Microsoft (MSRC)
almalinux:delve1.26.1-1.module_el8.10.0+4223+bd807c2e · AlmaLinux:8Package registry (OSV)
almalinux:git-lfs3.7.1-4.el9_8.3 · AlmaLinux:9Package registry (OSV)
almalinux:go-toolset1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-bin1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-docs1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-misc1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-race1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-src1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
almalinux:golang-tests1.26.4-1.el10_2.alma.1 · AlmaLinux:10Package registry (OSV)
alpine:go1.26.8-r0 · Alpine:v3.24Package registry (OSV)
debian:golang-1.251.25.11-1 · Debian:14Package registry (OSV)
debian:golang-1.261.26.4-1 · Debian:14Package registry (OSV)
Go:stdlib1.25.11Package registry (OSV)
Go:stdlib1.26.4Package registry (OSV)
opensuse:go1.251.25.11-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:go1.261.26.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:rclone1.74.3-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:go-toolset0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:golang0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:golang-bin0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:golang-docs0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:golang-misc0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:golang-race0:1.26.4-1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+19

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-532 · Insertion of Sensitive Information into Log File

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records