CVE-2026-49755Public exploitNetwork attack vector

Memory-exhaustion DoS via unbounded response decompression

Published Jun 8, 2026 · Updated Jun 8, 2026

Data amplification in Wojtek Mach Req 0.1.0 through 0.6.0 allows remote attackers to crash the BEAM process via a crafted HTTP response. Req.Steps.decode_body/1 materializes entire archives in memory without size caps, while decompress_body/1 chains server-selected compression decoders without bounds. The default response pipeline is exposed when an application fetches an attacker-controlled or redirect-reachable URL; the reported impact is memory exhaustion and process termination.

CVSS severity8.2
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data amplification in Wojtek Mach Req 0.1.0 through 0.6.0 allows remote attackers to crash the BEAM process via a crafted HTTP response. Req.Steps.decode_body/1 materializes entire archives in memory without size caps, while decompress_body/1 chains server-selected compression decoders without bounds. The default response pipeline is exposed when an application fetches an attacker-controlled or redirect-reachable URL; the reported impact is memory exhaustion and process termination.

The record

CVE
CVE-2026-49755
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
Wojtek Mach
Product
Req
Classifications
CWE-409, CAPEC-197, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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.

  1. Affected versionversion=0.1.0 <0.6.1
  2. Affected versionversion=e37753741cbdc725e6aba3d977b380163bfc0ecb <84977e5b1a83f26e749d55ad06e3625464af4e8d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wojtek Mach · Reqversion=0.1.0 <0.6.1; version=e37753741cbdc725e6aba3d977b380163bfc0ecb <84977e5b1a83f26e749d55ad06e3625464af4e8d

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
CAPEC-197Exponential Data Expansion
T1499.004Application or System Exploitation

Public exploit references

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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