CVE-2026-57164Network attack vectorHinoki check available

Memory corruption via single-step response-buffer growth

Published Sep 4, 2026 · Updated Sep 4, 2026

Heap buffer overflow in the PJLIB-UTIL HTTP client in Teluu PJPROJECT 2.17 and earlier allows remote attackers to corrupt memory via HTTP. http_on_data_read doubles the whole-body response buffer only once, then copies a chunk that can exceed the allocation when Content-Length is undersized. Reachability requires completion-callback buffering without on_data_read and a malicious or man-in-the-middle HTTP server; outcomes range from application crash to memory corruption.

CVSS severityUnavailable
Unscored
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap buffer overflow in the PJLIB-UTIL HTTP client in Teluu PJPROJECT 2.17 and earlier allows remote attackers to corrupt memory via HTTP. http_on_data_read doubles the whole-body response buffer only once, then copies a chunk that can exceed the allocation when Content-Length is undersized. Reachability requires completion-callback buffering without on_data_read and a malicious or man-in-the-middle HTTP server; outcomes range from application crash to memory corruption.

The record

CVE
CVE-2026-57164
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

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  1. Affected versionversion=< 8d5956afab2ede95ddb199078dc19a8ac0114f3d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=< 8d5956afab2ede95ddb199078dc19a8ac0114f3d

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

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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