Process slowdown via unbounded gzip stream drain
Published Feb 4, 2026 · Updated Feb 4, 2026
Uncontrolled resource consumption in Chainguard apko allows attackers to slow or time out a process by supplying a crafted APK stream. expandapk.Split reads the first tar header and then drains the gzip reader with io.Copy to io.Discard without an uncompressed-byte bound or inflate-ratio cap. Exploitation requires a caller to parse attacker-controlled input, and the affected range starts at 0.14.8 and ends before 1.1.0.
Summary
What happened
Uncontrolled resource consumption in Chainguard apko allows attackers to slow or time out a process by supplying a crafted APK stream. expandapk.Split reads the first tar header and then drains the gzip reader with io.Copy to io.Discard without an uncompressed-byte bound or inflate-ratio cap. Exploitation requires a caller to parse attacker-controlled input, and the affected range starts at 0.14.8 and ends before 1.1.0.
The record
- CVE
- CVE-2026-25122
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- Chainguard
- Product
- apko
- Classifications
- CWE-400, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 0.14.8, < 1.1.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo