CVE-2026-56864Patch

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-347

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Referenced assets1 URL

By indicator

https://www.valtersit.com/cve/CVE-2026-56864

Full discourse1 post

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters46d
Patch
CVE-2026-56864 - High severity Go module supply chain attack. Malicious GOSUMDB can serve unverified content bypassing transparency log. CVSS 7.5. Update Go toolchain and verify sums immediately. #CVE #GoLang #infosec https://www.valtersit.com/cve/CVE-2026-56864 #CVE #infosec #SysAdmin #cybersecurity #Linux #infosec #devsecops #devops #developer #sysadmin #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #ethicalhacking #cybersecurityawareness #cybersecurity #cybersecuritynews #cybersecuritytips #python #hacker #linux #kali #ubuntu #debian #ukraine #spain #ireland #unitedkingdom #canada #finland #estonia #lithuania #ireland #hungary #denmark #norway #malta
Post summary
The post alerts to CVE‑2026‑56864, a Go module supply‑chain vulnerability that bypasses GOSUMDB transparency checks, and urges immediate toolchain updates and checksum verification.
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