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GO-2026-6809

Bundled root certificates allow trust in distrusted emSign intermediates

Products / packages Go standard library crypto/x509 · webpki-roots · rustls-webpki · 2 more

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 23:35:33 UTC
CISA-ADP · CVSS:3.1 · 6.8
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity

medium6.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Package fixes recorded

Fix versions are recorded for 4 of 4 mapped packages. Check each release branch and any separate product guidance.

What this means

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action.

Source excerpt · OSV

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Go standard library · Go

crypto/x509

2 ranges
Go version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 1.26.10

semver versions

1.27.0-0 → before 1.27.3

semver versions

unaffected

unknown

Other versions: unaffected

Packages

Compare each installed version with the publisher’s affected ranges. Where a fix is recorded, choose the appropriate release branch and test compatibility before upgrading.

webpki-roots crates.io
Affected range Recorded fix
From 0.0.0-0 before 0.26.11Semantic versions0.26.11
From 0.26.12-0 before 1.0.10Semantic versions1.0.10

Version evidence: OSV · RUSTSEC-2026-0381

View original version evidence (0 explicit versions)
rustls-webpki crates.io
Affected range Recorded fix
From 0.0.0-0 before 0.103.16Semantic versions0.103.16
From 0.104.0-alpha.1 before 0.104.0-alpha.8Semantic versions0.104.0-alpha.8

Version evidence: OSV · RUSTSEC-2026-0382

View original version evidence (0 explicit versions)
webpki-root-certs crates.io
Affected range Recorded fix
From 0.0.0-0 before 0.26.11Semantic versions0.26.11
From 0.26.12-0 before 1.0.10Semantic versions1.0.10

Version evidence: OSV · RUSTSEC-2026-0383

View original version evidence (0 explicit versions)
stdlib Go
Affected range Recorded fix
Earlier releases before 1.26.10Semantic versions1.26.10
From 1.27.0-0 before 1.27.3Semantic versions1.27.3

Version evidence: OSV · GO-2026-6809

View original version evidence (0 explicit versions)

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Use the recorded fix for your release branch. Review the publisher’s instructions and test compatibility before upgrading.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action.

To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

References

15 sources
crates.io/crates/webpki-roots
Source reference
rustsec.org/advisories/RUSTSEC-2026-0381.html
Security advisory
rustls/webpki-roots · pull request #133
Patch
emudhra.we-have-a-problem.com/
Source reference
bugzilla.mozilla.org/show_bug.cgi
Source reference
crates.io/crates/rustls-webpki
Source reference
View 9 more references
rustsec.org/advisories/RUSTSEC-2026-0382.html
Security advisory
rustls/webpki · pull request #546
Patch
crates.io/crates/webpki-root-certs
Source reference
rustsec.org/advisories/RUSTSEC-2026-0383.html
Security advisory
go.dev/cl/851047
Source referenceGo
go.dev/issue/82345
Source referenceGo
groups.google.com/g/golang-announce/c/66pojueaQek
Source referenceGo
pkg.go.dev/vuln/GO-2026-6809
Security advisoryGo
www.openwall.com/lists/oss-security/2026/10/20/29
Security advisoryCVE

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-111943

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-299 ↗

CWE-299 Improper Check for Certificate Revocation

CISA-ADP

Related →
Contributing organizations · 3
Go

Assigning organization

2026-10-21
CVE

Additional data publisher

2026-10-21
CISA-ADP

Additional data publisher

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.