Security readout for executives and security teams
Plain-English summary
This CVE affects Cloudflare's Go LZ4 binding. If an application uses the vulnerable golz4 code on data supplied by users or external systems, memory corruption could potentially allow code execution. The business risk is high where compression handling is internet-facing or processes untrusted files, messages, or API payloads.
Executive priority
Prioritize any internet-facing or multi-tenant service that processes compressed input. If golz4 is present only in internal, trusted workflows, urgency is lower but remediation should still be tracked because the vulnerability class can have severe impact.
Technical view
The issue is an out-of-bounds write in github.com/cloudflare/golz4 caused by use of a deprecated LZ4 C API. The CVE maps to CWE-787 and has CVSS 3.1 score 9.8. Sources describe possible arbitrary code execution when vulnerable code is called with untrusted input.
Likely exposure
Exposure is limited to Go applications that import github.com/cloudflare/golz4 and use the vulnerable version or code path. Risk is highest where LZ4 data can come from users, tenants, files, APIs, queues, or network services.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The risk comes from unauthenticated, low-complexity memory corruption potential if vulnerable parsing is reachable with untrusted input.
Researcher notes
The source bundle identifies affected package github.com/cloudflare/golz4, version value 0, and default status unaffected. Evidence is enough to triage dependency exposure, but incomplete for exact affected release ranges or exploitation in the wild.
Mitigation direction
- Inventory Go services for github.com/cloudflare/golz4 usage.
- Follow pkg.go.dev and vendor guidance for GO-2020-0022 remediation.
- Use a version or source revision containing the referenced Cloudflare fix.
- Avoid processing untrusted LZ4 input through golz4 until remediated.
- Rebuild and redeploy affected services after dependency remediation.
Validation and detection
- Inspect dependency manifests, lockfiles, and SBOMs for github.com/cloudflare/golz4.
- Identify whether external data reaches golz4 compression or decompression paths.
- Confirm the deployed artifact no longer contains the vulnerable golz4 code.
- Review crash, memory fault, and abnormal restart telemetry for affected services.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2014-125026 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/cloudflare/golz4/commit/199f5f7878062ca17a98e079f2dbe1205e2ed898CVE reference
- https://github.com/cloudflare/golz4/issues/5CVE reference
- https://pkg.go.dev/vuln/GO-2020-0022CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.