Trending
CVE-2026-39819

CVE detail

CVE-2026-39819

The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.

CVSS 5.3 · MediumBuzz score 37.9

Buzz score

Why this CVE is surfacing

Buzz score total 37.9

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 17.9 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

17.9

5 evidence mentions in the snapshot

Diversity score

20.0

4 sources across 4 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 0; within the 30d window
Peak daily: 0; highest bucket

Evidence

Source links by recency

Newest mentions first

5 source links · newest first

CVE-2026-39819 Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/goMicrosoft MSRC
Information published.
vendormsrc.microsoft.comMay 10, 2026, 8:02 AM
https://pkg.go.dev/vuln/GO-2026-4978pkg.go.dev
No excerpt available.
Exploitpkg.go.devMay 7, 2026, 8:16 PM
https://groups.google.com/g/golang-announce/c/qcCIEXso47Mgroups.google.com
No excerpt available.
Patchgroups.google.comMay 7, 2026, 8:16 PM
https://go.dev/issue/78584go.dev
No excerpt available.
Vendor Advisorygo.devMay 7, 2026, 8:16 PM
https://go.dev/cl/763882go.dev
No excerpt available.
Vendor Advisorygo.devMay 7, 2026, 8:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

Related records

Similar CVEs

6 related CVEs with shared weakness or product evidence

CVE-2026-32282
On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lie…
CVSS 6.4 · Medium
5 mentions
CVE-2025-0913
os.OpenFile(path, os.O_CREATE|O_EXCL) behaved differently on Unix and Windows systems when the target path was a dangling symlink. On Unix systems, OpenFile with O_CREATE and O_EX…
CVSS 5.5 · Medium
4 mentions
CVE-2021-23772
This affects all versions of package github.com/kataras/iris; all versions of package github.com/kataras/iris/v12. The unsafe handling of file names during upload using UploadForm…
CVSS 7.5 · High
CVE-2026-43765
This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to modify prote…
CVSS 5.5 · Medium
3 mentions
CVE-2026-17459
A vulnerability was determined in perwendel spark up to 2.9.4. This vulnerability affects the function staticFiles.externalLocation of the file src/main/java/spark/resource/Extern…
CVSS 2.1 · Low
6 mentions
CVE-2026-12503
Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `lar…
CVSS 9.2 · Critical
1 mention

External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-39819.

Product-level CPE searches intentionally omit version fields and NVD version-range or configuration certainty. Verify the exact product version and configuration independently.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:a:golang:goSearch this product on Shodan

Exact CVE query

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Metadata

Canonical fields

NVD status

Analyzed

Published

May 7, 2026

Modified

Jun 17, 2026

Official record

Authoritative NVD record

CVSS vector

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

CWE IDs

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): High. Successful exploitation depends on conditions outside the attacker's control.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): Low. There is a limited impact to this security property.
Integrity Impact (I): High. There is a total or serious impact to this security property.
Availability Impact (A): None. There is no direct impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses