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Noroxi
NVD / CVE Program· CNA Go

CVE-2026-33811: Crash when handling long CNAME response in net

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.87% (FIRST EPSS); higher than 59.3% of all records.
  • 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 1.25.10, 1.26.3.

Low priority for now. Upgrade to Go standard library net 1.25.10, 1.26.3 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 using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Published
May 7, 2026
Updated
Oct 26, 2026
EPSS
0.8% · 59th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · Go
7.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2026-33811

When you'll hear from us

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  • 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

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

    • before 1.25.10affected · semver
    • 1.26.0-0 and later · before 1.26.3affected · semver

Affected versions

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

  • golang gobefore 1.25.10
  • golang go1.26.0 and later · before 1.26.3

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10git-lfsbefore 3.7.1-5.el10_2.63.7.1-5.el10_2.6
AlmaLinux:10ipp-usbbefore 0.9.27-7.el10_2.20.9.27-7.el10_2.2
AlmaLinux:10opentelemetry-collectorbefore 0.152.1-1.el10_20.152.1-1.el10_2
AlmaLinux:10yggdrasilbefore 0.4.9.2-1.el10_20.4.9.2-1.el10_2
AlmaLinux:10yggdrasil-develbefore 0.4.9.2-1.el10_20.4.9.2-1.el10_2
AlmaLinux:8aardvark-dnsbefore 2:1.10.1-2.module_el8.10.0+3909+6e1c1eb72:1.10.1-2.module_el8.10.0+3909+6e1c1eb7
AlmaLinux:8aardvark-dnsbefore 2:1.10.1-2.module_el8.10.0+4047+545787c42:1.10.1-2.module_el8.10.0+4047+545787c4
AlmaLinux:8aardvark-dnsbefore 2:1.10.1-2.module_el8.10.0+4089+ce72bbbe2:1.10.1-2.module_el8.10.0+4089+ce72bbbe
AlmaLinux:8aardvark-dnsbefore 2:1.10.1-2.module_el8.10.0+3901+4b80ecd72:1.10.1-2.module_el8.10.0+3901+4b80ecd7
AlmaLinux:8buildahbefore 2:1.33.14-4.module_el8.10.0+4213+0493256b2:1.33.14-4.module_el8.10.0+4213+0493256b
AlmaLinux:8buildah-testsbefore 2:1.33.14-4.module_el8.10.0+4213+0493256b2:1.33.14-4.module_el8.10.0+4213+0493256b
AlmaLinux:8cockpit-podmanbefore 84.1-1.module_el8.10.0+4102+6c76e54484.1-1.module_el8.10.0+4102+6c76e544
AlmaLinux:8conmonbefore 3:2.1.10-1.module_el8.10.0+4068+0e21408f3:2.1.10-1.module_el8.10.0+4068+0e21408f
AlmaLinux:8conmonbefore 3:2.1.10-1.module_el8.10.0+3970+8445edf63:2.1.10-1.module_el8.10.0+3970+8445edf6
AlmaLinux:8conmonbefore 3:2.1.10-1.module_el8.10.0+4090+919323383:2.1.10-1.module_el8.10.0+4090+91932338
AlmaLinux:8container-selinuxbefore 2:2.229.0-3.module_el8.10.0+4213+0493256b2:2.229.0-3.module_el8.10.0+4213+0493256b
AlmaLinux:8containernetworking-pluginsbefore 1:1.4.0-8.module_el8.10.0+4136+164253431:1.4.0-8.module_el8.10.0+4136+16425343
AlmaLinux:8containers-commonbefore 2:1-82.module_el8.10.0+3876+e55593a82:1-82.module_el8.10.0+3876+e55593a8
AlmaLinux:8containers-commonbefore 2:1-82.module_el8.10.0+4089+ce72bbbe2:1-82.module_el8.10.0+4089+ce72bbbe
AlmaLinux:8containers-commonbefore 2:1-82.module_el8.10.0+3901+4b80ecd72:1-82.module_el8.10.0+3901+4b80ecd7
AlmaLinux:8critbefore 3.18-5.module_el8.10.0+3845+87b845523.18-5.module_el8.10.0+3845+87b84552
AlmaLinux:8critbefore 3.18-5.module_el8.10.0+4120+03ad4b473.18-5.module_el8.10.0+4120+03ad4b47
AlmaLinux:8critbefore 3.18-5.module_el8.10.0+3901+4b80ecd73.18-5.module_el8.10.0+3901+4b80ecd7
AlmaLinux:8critbefore 3.18-5.module_el8.10.0+4047+545787c43.18-5.module_el8.10.0+4047+545787c4

+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…
    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…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-32289Apr 7, 2026 · JsBraceDepth Context Tracking Bugs (XSS) in html/template
    24Monitor
  • ← EarlierCVE-2026-33810Apr 7, 2026 · Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
    32Monitor
  • Later →CVE-2026-33814May 7, 2026 · Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
    30Monitor

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 net1.25.10Vendor (CNA)
Go standard library net1.26.3Vendor (CNA)
azl3 golang 1.27.0-1 on Azure Linux 3.0—Microsoft (MSRC)
almalinux:aardvark-dns2:1.10.1-2.module_el8.10.0+3909+6e1c1eb7 · AlmaLinux:8Package registry (OSV)
almalinux:buildah2:1.33.14-4.module_el8.10.0+4213+0493256b · AlmaLinux:8Package registry (OSV)
almalinux:buildah-tests2:1.33.14-4.module_el8.10.0+4213+0493256b · AlmaLinux:8Package registry (OSV)
almalinux:cockpit-podman84.1-1.module_el8.10.0+4102+6c76e544 · AlmaLinux:8Package registry (OSV)
almalinux:conmon3:2.1.10-1.module_el8.10.0+3970+8445edf6 · AlmaLinux:8Package registry (OSV)
almalinux:container-selinux2:2.229.0-3.module_el8.10.0+4213+0493256b · AlmaLinux:8Package registry (OSV)
almalinux:containernetworking-plugins1:1.4.0-8.module_el8.10.0+4136+16425343 · AlmaLinux:8Package registry (OSV)
almalinux:containers-common2:1-82.module_el8.10.0+3876+e55593a8 · AlmaLinux:8Package registry (OSV)
almalinux:crit3.18-5.module_el8.10.0+4047+545787c4 · AlmaLinux:8Package registry (OSV)
almalinux:delve1.25.2-1.module_el8.10.0+4074+24330916 · AlmaLinux:8Package registry (OSV)
almalinux:go-toolset1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-bin1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-docs1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-misc1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-race1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-src1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:golang-tests1.25.10-1.module_el8.10.0+4187+c45165c4 · AlmaLinux:8Package registry (OSV)
almalinux:ipp-usb0.9.27-7.el10_2.2 · AlmaLinux:10Package registry (OSV)
almalinux:oci-seccomp-bpf-hook1.2.11-2.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:opentelemetry-collector0.152.1-1.el10_2 · AlmaLinux:10Package registry (OSV)
alpine:go1.25.10-r0 · Alpine:v3.23Package registry (OSV)
alpine:rclone1.74.1-r0 · Alpine:v3.24Package registry (OSV)
debian:golang-1.251.25.10-1 · Debian:14Package registry (OSV)
debian:golang-1.261.26.3-1 · Debian:14Package registry (OSV)
Go:stdlib1.25.10Package registry (OSV)
Go:stdlib1.26.3Package registry (OSV)

+30

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.

Credits

All researchers

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

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.

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
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (19 more)

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

All records