Vulnerability · Published Sep 4, 2026 · Assigned by GitHub_M
CVE-2026-57159PJSIP: SDP parser out-of-bounds write in remote payload-type map maintenance
High 8.4
In plain English
A high-severity out-of-bounds write in pjproject from pjsip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
PJSIP is a free and open source multimedia communication library written in C. Prior to commit 673b978, a remote out-of-bounds read and write can occur in the SDP negotiator when the remote payload-type map maintenance feature is enabled. assign_pt_and_update_map() in pjmedia/src/pjmedia/sdp_neg.c uses payload-type numbers taken from a remote SDP offer or answer to index fixed-size internal tables without sufficient bounds validation, so a crafted remote SDP can cause memory access outside those tables. The practical impact is memory corruption and denial of service; code execution is not demonstrated. This path is only reached when PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP is enabled. The default is disabled, so default builds are not affected; the feature is an interoperability option that integrating products may enable. This issue has been patched via commit 673b978.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | asterisk | no fix listed | DEBIAN-CVE-2026-57159 |
| Ubuntu:22.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57159 |
| Ubuntu:24.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57159 |
| Ubuntu:26.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2026-57159 |
| Ubuntu:26.10 | asterisk | no fix listed | UBUNTU-CVE-2026-57159 |
Affected products (as reported)
Weakness: CWE-129, CWE-787 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N