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NVD / CVE Program· CNA Go

CVE-2023-29406: Insufficient sanitization of Host header in net/http

Noroxi assessment

Priority: Monitor (action score 26/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.4% (FIRST EPSS); higher than 73.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Go standard library net/http 1.19.11, 1.20.6; azl3 golang 1.20.7-1 on Azure Linux 3.0 1.20.7-1; cbl2 golang 1.17.13-2 on CBL Mariner 2.0 CBL-Mariner Releases.

Low priority for now. Upgrade to Go standard library net/http 1.19.11, 1.20.6; azl3 golang 1.20.7-1 on Azure Linux 3.0 1.20.7-1; cbl2 golang 1.17.13-2 on CBL Mariner 2.0 CBL-Mariner Releases 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

The HTTP/1 client does not fully validate the contents of the Host header. A maliciously crafted Host header can inject additional headers or entire requests. With fix, the HTTP/1 client now refuses to send requests containing an invalid Request.Host or Request.URL.Host value.

MediumCVSS 6.5 · v3.1—Proof of concept Fix available
Published
Jul 11, 2023
Updated
Jun 17, 2026
EPSS
1.4% · 73th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.4%

CISA SSVC decision

Exploitation
none
Automatable
no
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
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

Follow CVE-2023-29406

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.

VendorProduct
golanggo

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • golang gobefore 1.19.11
  • golang go1.20.0 and later · before 1.20.6

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/http

    • before 1.19.11affected · semver
    • 1.20.0-0 and later · before 1.20.6affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8aardvark-dnsbefore 2:1.0.1-38.module_el8.9.0+3627+db8ec1552:1.0.1-38.module_el8.9.0+3627+db8ec155
AlmaLinux:8aardvark-dnsbefore 2:1.7.0-1.module_el8.9.0+3657+d86e192f2:1.7.0-1.module_el8.9.0+3657+d86e192f
AlmaLinux:8buildahbefore 1:1.31.3-1.module_el8.9.0+3643+9234dc3b1:1.31.3-1.module_el8.9.0+3643+9234dc3b
AlmaLinux:8buildahbefore 1:1.24.6-7.module_el8.9.0+3627+db8ec1551:1.24.6-7.module_el8.9.0+3627+db8ec155
AlmaLinux:8buildahbefore 1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8buildah-testsbefore 1:1.24.6-7.module_el8.9.0+3627+db8ec1551:1.24.6-7.module_el8.9.0+3627+db8ec155
AlmaLinux:8buildah-testsbefore 1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8buildah-testsbefore 1:1.31.3-1.module_el8.9.0+3643+9234dc3b1:1.31.3-1.module_el8.9.0+3643+9234dc3b
AlmaLinux:8cockpit-podmanbefore 75-1.module_el8.9.0+3643+9234dc3b75-1.module_el8.9.0+3643+9234dc3b
AlmaLinux:8cockpit-podmanbefore 46-1.module_el8.7.0+3344+5bcd850f46-1.module_el8.7.0+3344+5bcd850f
AlmaLinux:8conmonbefore 3:2.1.8-1.module_el8.9.0+3643+9234dc3b3:2.1.8-1.module_el8.9.0+3643+9234dc3b
AlmaLinux:8conmonbefore 2:2.1.4-2.module_el8.9.0+3627+db8ec1552:2.1.4-2.module_el8.9.0+3627+db8ec155
AlmaLinux:8conmonbefore 2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8container-selinuxbefore 2:2.205.0-3.module_el8.9.0+3627+db8ec1552:2.205.0-3.module_el8.9.0+3627+db8ec155
AlmaLinux:8container-selinuxbefore 2:2.221.0-1.module_el8.9.0+3643+9234dc3b2:2.221.0-1.module_el8.9.0+3643+9234dc3b
AlmaLinux:8container-selinuxbefore 2:2.205.0-3.module_el8.9.0+3687+dcd7ef8f2:2.205.0-3.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8containernetworking-pluginsbefore 1:1.1.1-5.module_el8.9.0+3687+dcd7ef8f1:1.1.1-5.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8containernetworking-pluginsbefore 1:1.1.1-5.module_el8.9.0+3627+db8ec1551:1.1.1-5.module_el8.9.0+3627+db8ec155
AlmaLinux:8containernetworking-pluginsbefore 1:1.3.0-4.module_el8.9.0+3643+9234dc3b1:1.3.0-4.module_el8.9.0+3643+9234dc3b
AlmaLinux:8containers-commonbefore 2:1-54.module_el8.9.0+3673+0c64b4032:1-54.module_el8.9.0+3673+0c64b403
AlmaLinux:8containers-commonbefore 2:1-38.module_el8.9.0+3627+db8ec1552:1-38.module_el8.9.0+3627+db8ec155
AlmaLinux:8critbefore 3.18-4.module_el8.9.0+3643+9234dc3b3.18-4.module_el8.9.0+3643+9234dc3b
AlmaLinux:8critbefore 3.15-3.module_el8.6.0+2877+8e437bf53.15-3.module_el8.6.0+2877+8e437bf5
AlmaLinux:8critbefore 3.15-3.module_el8.6.0+3137+d33c3efb3.15-3.module_el8.6.0+3137+d33c3efb

+96

Same product

golang: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-7187The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import path (get/vcs.go only
    54Plan
  • CVE-2018-16873In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to remote code execution when executed with the -u flag and
    52Plan
  • CVE-2021-38297Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function invocation from a WASM module, when GOARCH
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-29404Jun 8, 2023 · Improper handling of non-optional LDFLAGS in go command with cgo in cmd/go
    40Plan
  • ← EarlierCVE-2023-29405Jun 8, 2023 · Improper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/go
    40Plan
  • Later →CVE-2023-29409Aug 2, 2023 · Large RSA keys can cause high CPU usage in crypto/tls
    21Monitor

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/http1.19.11Vendor (CNA)
Go standard library net/http1.20.6Vendor (CNA)
azl3 golang 1.20.7-1 on Azure Linux 3.01.20.7-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 golang 1.17.13-2 on CBL Mariner 2.0CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 golang 1.18.8-7 on CBL Mariner 2.0CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 golang 1.20.7-1 on CBL Mariner 2.01.20.7-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 golang 1.21.6-1 on CBL Mariner 2.01.21.6-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 msft-golang 1.20.7-1 on CBL Mariner 2.01.20.7-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:buildah1:1.31.3-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:buildah-tests1:1.31.3-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:containernetworking-plugins1:1.3.0-4.el9 · AlmaLinux:9Package registry (OSV)
almalinux:podman2:4.6.1-5.el9 · AlmaLinux:9Package registry (OSV)
almalinux:podman-docker2:4.6.1-5.el9 · AlmaLinux:9Package registry (OSV)
almalinux:podman-gvproxy2:4.6.1-5.el9 · AlmaLinux:9Package registry (OSV)
almalinux:podman-plugins2:4.6.1-5.el9 · AlmaLinux:9Package registry (OSV)
almalinux:podman-remote2:4.6.1-5.el9 · AlmaLinux:9Package registry (OSV)
almalinux:skopeo2:1.13.3-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:skopeo-tests2:1.13.3-1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:toolbox0.0.99.4-6.el9_3 · AlmaLinux:9Package registry (OSV)
almalinux:toolbox-tests0.0.99.4-6.el9_3 · AlmaLinux:9Package registry (OSV)
alpine:go1.20.7-r0 · Alpine:v3.18Package registry (OSV)
Go:stdlib1.19.11Package registry (OSV)
Go:stdlib1.20.6Package registry (OSV)
opensuse:etcd3.5.12-150000.7.6.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:go1.191.19.11-150000.1.37.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:go1.19-openssl1.19.13.1-150000.1.8.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:go1.201.20.6-150000.1.17.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:go1.20-openssl1.20.6.1-150000.1.8.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:delve0:1.9.1-1.module+el8.8.0+16778+5fbb74f5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:delve-debuginfo0:1.9.1-1.module+el8.8.0+16778+5fbb74f5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)

+26

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02023-11-11

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.

  1. Published
  2. First PoC+122 d
  3. TodayNov 7, 2026+1215 d

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.

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.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-436 · Interpretation Conflict

CVSS vector

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

nvd-primary

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 (5 more)

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

All records