CVE-2026-59248Network attack vectorHinoki check available

Memory exhaustion via unbounded integer decoding

Published Jul 28, 2026 · Updated Jul 28, 2026

Resource exhaustion in Nine Nines Cowlib 2.0.0-pre.1 through 2.18.0 allows remote attackers to exhaust memory via crafted HPACK or QPACK integers. The cow_hpack_common:dec_big_int/3 decoder accepts unlimited continuation octets and repeatedly builds ever-wider immutable Erlang integers. An unauthenticated peer must reach an endpoint that decodes HPACK or QPACK; one large field triggers substantial transient allocation, and repeated connections can exhaust the Erlang VM.

CVSS severity8.7
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in Nine Nines Cowlib 2.0.0-pre.1 through 2.18.0 allows remote attackers to exhaust memory via crafted HPACK or QPACK integers. The cow_hpack_common:dec_big_int/3 decoder accepts unlimited continuation octets and repeatedly builds ever-wider immutable Erlang integers. An unauthenticated peer must reach an endpoint that decodes HPACK or QPACK; one large field triggers substantial transient allocation, and repeated connections can exhaust the Erlang VM.

The record

CVE
CVE-2026-59248
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Nine Nines
Product
Cowlib
Classifications
CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=2.0.0-pre.1 <2.19.0
  2. Affected versionversion=5ddecbc121f812aec53d9df91829448d8e94e44c <f582430498072a0c65ad338030321576dc13a343

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nine Nines · Cowlibversion=2.0.0-pre.1 <2.19.0; version=5ddecbc121f812aec53d9df91829448d8e94e44c <f582430498072a0c65ad338030321576dc13a343

Published CVSS scores

8.7Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

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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