CVE-2026-56851 golang.org/x/text CVE debrief

Who should care

Defenders responsible for maintaining or securing applications that utilize golang.org/x/text/secure/precis should assess exposure and verify the affected version. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that their systems are not vulnerable to this issue. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance,

Why it matters

CVE-2026-56851 is a vulnerability in the golang.org/x/text/secure/precis package that can cause a panic when parsing crafted input. Defenders should prioritize verifying the affected version and assessing exposure to prevent potential service disruption.

• Defenders need to verify the version of golang.org/x/text/secure/precis to prevent potential crashes
• Exposure to crafted input may cause service disruption

Technical summary

The Nickname profile in golang.org/x/text/secure/precis can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer. This occurs due to insufficient input validation, allowing an attacker to craft input that causes the program to panic. The vulnerability is triggered by the lack of proper bounds checking on the input, resulting in a potential denial-of-service (DoS) attack. Defenders should prioritize verifying the affected version of golang.org/x/text/secure/precis in their inventory and assessing exposure to crafted input.

Defensive priority

Defenders should prioritize verifying the affected version of golang.org/x/text/secure/precis in their inventory and assessing exposure to crafted input.

Recommended defensive actions

• Verify the version of golang.org/x/text/secure/precis in your inventory
• Assess exposure to crafted input
• Consider updating to a version that addresses this issue
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail page provide official information about this vulnerability. Additional source references are available from Go issue tracking and vulnerability databases.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.