CVE-2026-75143Disclosure

LOWCVSS 9.3 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

Patch or workaround signal is available
4 mentions across 3 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 4 signals
Disclosure: 3 classified signals
Peaked 2d ago at 2 mentions (2026-08-19); latest day: 1
4 total mentions across 3 days

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

Disclosure

375.0%

Patch

125.0%

Referenced assets2 URLs

By indicator

Classification over time

Date	Total	Labels

2026-08-19	2	Disclosure2
2026-08-20	1	Disclosure1
2026-08-23	1	Patch1

Full discourse4 posts

David Chen@amtecco43d
Patch
CVE-2026-75143: heap overflow in FFmpeg's RIST reader. CVSS 9.3. librist_read() ignored its size argument. Over async:rist:// the wrapper hands it a smaller buffer than the payload, so a remote sender can overflow it. Not a RIST protocol flaw. An FFmpeg one. Fixed in 1c10bcc.
Post summary
The post reports a severe heap overflow in FFmpeg’s RIST reader, details the technical exploitation scenario, and notes the fix in commit 1c10bcc, with no evidence of current exploitation or PoC.
0000057
26 followersView on X
Upwind Security MDR@UpwindMDR45d
Disclosure
🚨Critical - FFmpeg RIST protocol reader heap overflow (CVE-2026-75143) librist_read() in libavformat/librist.c ignores its size argument and copies the full received payload into the caller's buffer, overflowing it. Reachable via async:rist://, where the async wrapper supplies a smaller buffer than the payload — a remote RIST sender triggers it with one oversized packet, no auth, no interaction. Only affects librist-enabled builds ingesting RIST streams. 👉Affected: FFmpeg before commit 1c10bcc | Upgrade to a build including 1c10bcc · CVSS 9.8 · no fixed release yet
Post summary
FFmpeg CVE‑2026‑75143 is a critical RIST protocol heap overflow with a CVSS score of 9.8. It is mitigated by upgrading to a build that includes commit 1c10bcc, though no fixed release is yet available.
0000067
292 followersView on X
Infoflowcloud@infoflowcloud46d
Disclosure
🚨*CVE* CVE-2026-75143 FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied … https://www.cve.org/CVERecord?id=CVE-2026-75143 ----- Traducción: CVE-2026-75143 FFm… https://infoflow.cloud`
Post summary
The post announces a heap buffer overflow CVE‑2026‑75143 in FFmpeg’s RIST protocol reader, providing technical details but no PoC, patch, or evidence of active exploitation.
0000027
100 followersView on X
CVE@CVEnew46d
Disclosure
CVE-2026-75143 FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied … https://www.cve.org/CVERecord?id=CVE-2026-75143
Post summary
The post reports a newly disclosed heap buffer overflow in FFmpeg’s RIST protocol reader, providing technical details but no PoC, exploit, or mitigation information.
000001.1K
58.0K followersView on X

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What researchers are saying

CVE-2026-75143

David Chen[verified]@amteccoPatch

The post reports a severe heap overflow in FFmpeg’s RIST reader, details the technical exploitation scenario, and notes the fix in commit 1c10bcc, with no evidence of current exploitation or PoC.

Upwind Security MDR[verified]@UpwindMDRDisclosure

FFmpeg CVE‑2026‑75143 is a critical RIST protocol heap overflow with a CVSS score of 9.8. It is mitigated by upgrading to a build that includes commit 1c10bcc, though no fixed release is yet available.

Infoflowcloud@infoflowcloudDisclosure

The post announces a heap buffer overflow CVE‑2026‑75143 in FFmpeg’s RIST protocol reader, providing technical details but no PoC, patch, or evidence of active exploitation.

CVE@CVEnewDisclosure

The post reports a newly disclosed heap buffer overflow in FFmpeg’s RIST protocol reader, providing technical details but no PoC, exploit, or mitigation information.