Bug 2531076

Summary:	CVE-2026-57159 asterisk: SDP parser out-of-bounds write in remote payload-type map maintenance [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	asterisk	Assignee:	Peter Lemenkov <lemenkov>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	bennie.joubert, jsmith.fedora, lemenkov
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["7555d253-04bd-4216-bec0-919fdab3bde1"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-11 19:56:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2528774

Description Guilherme de Almeida Suckevicz 2026-09-09 17:24:59 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Peter Lemenkov 2026-09-11 19:48:44 UTC

Not applicable to Asterisk as built here.

This is an out-of-bounds read and write in the SDP negotiator, assign_pt_and_update_map() in pjmedia/src/pjmedia/sdp_neg.c. The upstream advisory states that this path is only reached when PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP is enabled, and that the default is disabled so default builds are not affected.

Asterisk's bundled pjproject does not define PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP in third-party/pjproject/patches/config_site.h, so it is left at its default of disabled.

Fixed upstream in pjproject commit 673b978.

Comment 2 Peter Lemenkov 2026-09-11 19:56:48 UTC

Closing as NOTABUG per the analysis above — the vulnerable path is gated behind PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP, which Asterisk leaves at its default of disabled.

As with the other pjproject CVEs in this batch, this is a reachability determination rather than the code being absent: the affected function is still compiled into the bundled library. It would need revisiting if Asterisk enabled that option.