CVE-2026-47078

Arbitrary file write via ZIP depth-counter bypass

Published Jul 27, 2026 · Updated Jul 27, 2026

Relative path traversal in Erlang/OTP allows attackers to write files outside ZIP extraction roots using a crafted archive. The stdlib zip:unzip and zip:extract routines accept an entry such as ../x/y because check_dir_level rejects only a final negative depth after traversal recovers to zero. An application must process attacker-supplied content through either routine, and writes remain limited by that application's filesystem privileges.

CVSS severity4.8
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Relative path traversal in Erlang/OTP allows attackers to write files outside ZIP extraction roots using a crafted archive. The stdlib zip:unzip and zip:extract routines accept an entry such as ../x/y because check_dir_level rejects only a final negative depth after traversal recovers to zero. An application must process attacker-supplied content through either routine, and writes remain limited by that application's filesystem privileges.

The record

CVE
CVE-2026-47078
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-23, CAPEC-139
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=27.1 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]
  2. Affected versionversion=6.1 <* changes=[{"at":"8.0.3","status":"unaffected"},{"at":"7.3.0.1","status":"unaffected"},{"at":"6.2.2.4","status":"unaffected"}]
  3. Affected versionversion=8d537f51a4262d24f3395c4148323eaca9facbbd <8a933c9c7835b06776d31d17b79b7336627d887a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Erlang · Erlang/OTPversion=27.1 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]; version=6.1 <* changes=[{"at":"8.0.3","status":"unaffected"},{"at":"7.3.0.1","status":"unaffected"},{"at":"6.2.2.4","status":"unaffected"}]; version=8d537f51a4262d24f3395c4148323eaca9facbbd <8a933c9c7835b06776d31d17b79b7336627d887a

Published CVSS scores

4.8Erlang Ecosystem FoundationCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CAPEC-139Relative Path Traversal

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

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Your stack

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