CVE-2026-57160Network attack vector

One-byte overwrite via unchecked header delimiter

Published Sep 4, 2026 · Updated Sep 4, 2026

Off-by-one error in Teluu PJPROJECT 2.17 and earlier allows remote attackers to write one byte past a SIP serialization buffer. In pjsip_generic_array_hdr_print(), unchecked stores for the colon-space delimiter can exhaust the output buffer and place the trailing space beyond its end. Reachability requires a proxy, SBC, B2BUA, or similar application to re-serialize peer-controlled SIP requests; typical pool allocations absorb the fixed byte in slack space.

CVSS severity6.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Off-by-one error in Teluu PJPROJECT 2.17 and earlier allows remote attackers to write one byte past a SIP serialization buffer. In pjsip_generic_array_hdr_print(), unchecked stores for the colon-space delimiter can exhaust the output buffer and place the trailing space beyond its end. Reachability requires a proxy, SBC, B2BUA, or similar application to re-serialize peer-controlled SIP requests; typical pool allocations absorb the fixed byte in slack space.

The record

CVE
CVE-2026-57160
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
PJSIP
Product
PJPROJECT
Classifications
CWE-193
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?

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

  1. Affected versionversion=< d6a0e7f76611c3a6f530ee051e3e7a622bb1748c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PJSIP · PJPROJECTversion=< d6a0e7f76611c3a6f530ee051e3e7a622bb1748c

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/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-193Off-by-one Error

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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