A Zip Slip vulnerability in the /upload endpoint of codeskyblue gohttpserver through v1.3.0 allows attackers to write arbitrary files via…
Affects codeskyblue gohttpserver through v1.3.0 when started with the --upload flag enabled. No fixed version is listed; disabling --upload is the stated workaround.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- Proof of concept public, per CISA
- Fix
- No fix listed
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affects gohttpserver all versions through v1.3.0 The --upload flag must be enabled
- Exploitation15/40CISA rates a proof of concept as public
- Exposure15/25Specific setups only, CISA rates it automatable
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity10/10CVSS 9.8, total technical impact per CISA
- No patch5/5No patch listed yet
What would change the score
- Would score about 80 if added to CISA KEV
- Would score about 75 if CISA's SSVC rates exploitation active
CVE-2026-38600 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical); no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 45/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: poc
- Automatable: yes
- Technical impact: total
Summary
codeskyblue gohttpserver, a Go-based HTTP file server, is affected by a flaw in its /upload endpoint that lets an attacker write files to arbitrary locations on the server by uploading a specially crafted ZIP archive. This could allow an attacker to overwrite or plant files outside the intended directory, potentially compromising the server.
Read the original description
A Zip Slip vulnerability in the /upload endpoint of codeskyblue gohttpserver through v1.3.0 allows attackers to write arbitrary files via uploading a crafted Zip archive.
What to do
Check whether your setup matches what the bug needs.
Affects gohttpserver all versions through v1.3.0 The --upload flag must be enabledWorkaround: Disable the --upload flag
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: poc · Automatable: yes · Technical impact: total
- Record last updated
- Posted on X by cve.now
Evidence 4
- Advisory
- Repository
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-38600
Is CVE-2026-38600 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The /upload endpoint extracts ZIP archives sent with unzip=true, and a crafted archive can write files outside the upload directory. Those files are written with the privileges of the server process. The reporter says this can lead to remote code execution, such as overwriting cron jobs or SSH authorized keys.Source: github.com
Am I affected, and how do I check?
All versions through v1.3.0 are listed as affected, but only when the --upload flag is enabled, since that is what makes the upload endpoint accept ZIP archives with unzip=true. To check a setup, look at the command line or configuration used to start gohttpserver for the --upload flag.Source: github.com
How do I fix CVE-2026-38600?
No fixed version is listed in the facts, so there is no upgrade target to name. The stated mitigation is to disable the --upload flag.Source: github.com
What if there's no patch?
Disable the --upload flag, which the source gives as the workaround. With the flag off, the upload endpoint no longer accepts the ZIP archives that trigger this issue.Source: github.com