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PatchSiren cyber security CVE debrief

CVE-2026-32288 Golang CVE debrief

A vulnerability in the Go programming language's tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the 'old GNU sparse map' format. This issue has been assigned a CVSS score of 5.5 and a severity of MEDIUM. The vulnerability exists due to the lack of proper memory allocation checks in the tar.Reader component. Users of the Go programming language, particularly those who handle archives, should be aware of this vulnerability and take steps to mitigate it.

Vendor
Golang
Product
Go
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-25
Advisory published
2026-04-08
Advisory updated
2026-07-25

Who should care

Users of the Go programming language, particularly those who handle archives, should be aware of this vulnerability and take steps to mitigate it. This includes developers, system administrators, and security teams who use or manage Go-based applications.

Technical summary

The vulnerability exists in the tar.Reader component of the Go programming language. When reading a maliciously-crafted archive containing a large number of sparse regions encoded in the 'old GNU sparse map' format, tar.Reader can allocate an unbounded amount of memory. This can lead to a denial-of-service (DoS) attack. The issue has been addressed in Go versions 1.25.10 and 1.26.3. Users should update to a patched version of Go or use a patched version of tar.Reader.

Defensive priority

Medium

Recommended defensive actions

  • Update to Go version 1.25.10 or 1.26.3 or later
  • Use a patched version of tar.Reader
  • Validate and sanitize archive files before processing
  • Monitor system resources for unusual activity
  • 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

Evidence notes

The CVE record was published on 2026-04-08T02:16:03.707Z and last modified on 2026-07-25T10:10:00.167Z. The NVD entry is currently Analyzed. This information is based on the provided source corpus. Further verification is recommended to ensure accuracy.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32288 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32288

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-32288 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32288

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.