CVE-2026-57163Network attack vectorHinoki check available

Memory corruption via oversized certificate SubjectAltName

Published Sep 4, 2026 · Updated Sep 4, 2026

Stack buffer overflow in PJPROJECT 2.17 and earlier allows remote attackers to corrupt memory via a crafted TLS peer certificate. The SAN-counting loop in tls_cert_get_info() passes a stale 512-byte length to GnuTLS for a 256-byte stack buffer, allowing an oversized SubjectAltName to overwrite adjacent stack memory. Exploitation requires a GnuTLS build and control of the peer certificate during the TLS handshake; outcomes range from application termination to control-flow hijack.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack buffer overflow in PJPROJECT 2.17 and earlier allows remote attackers to corrupt memory via a crafted TLS peer certificate. The SAN-counting loop in tls_cert_get_info() passes a stale 512-byte length to GnuTLS for a 256-byte stack buffer, allowing an oversized SubjectAltName to overwrite adjacent stack memory. Exploitation requires a GnuTLS build and control of the peer certificate during the TLS handshake; outcomes range from application termination to control-flow hijack.

The record

CVE
CVE-2026-57163
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-121, T1499.004, T1203, T1190
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

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=< c4a151af86fadd16d9480b2603eeb2abf4fb4f78

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=< c4a151af86fadd16d9480b2603eeb2abf4fb4f78

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.

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

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation
T1203Exploitation for Client Execution
T1190Exploit Public-Facing Application

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo