VulnSocial

CVE-2026-3949Disclosure

LOWCVSS 1.9 · LOW

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-119CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 4 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 4 signals
  • Disclosure: 4 classified signals
  • Peaked at 2 mentions on most recent observed day (2026-07-21)
  • 4 total mentions across 3 days

Deep dive

Activity timeline4 mentions / 3d
01122Mentions · 2026-03-11: 1Mentions · 2026-03-12: 1Mentions · 2026-07-21: 2Technical Details · 2026-03-11: 1Technical Details · 2026-03-12: 1Technical Details · 2026-07-21: 203-1103-1207-21
Signal classification1 categories
Disclosure
4100.0%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-03-111
Disclosure1
2026-03-121
Disclosure1
2026-07-212
Disclosure2
Full discourse4 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-47251 libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security… https://www.cve.org/CVERecord?id=CVE-2026-47251 ----- Traducción: CVE-2026-47251 lib… http://infoflow.cloud`

    Post summary

    The post cites CVE-2026-47251 and notes that a patch for CVE-2026-3949 introduced an integer overflow, but it provides no PoC, exploit code, or evidence of active exploitation.

    0000035
    94 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-47251 libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security… https://www.cve.org/CVERecord?id=CVE-2026-47251

    Post summary

    The post discloses an integer overflow flaw in libheif that was introduced by a previous fix, but it does not mention a PoC, exploit, patch, or active exploitation.

    000001.1K
    57.8K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-3949 A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the compon… https://www.cve.org/CVERecord?id=CVE-2026-3949

    Post summary

    The post reports the discovery of CVE-2026-3949 in strukturag libheif, identifying the affected function and file but providing no exploit details, patch information, or evidence of active exploitation.

    00000132
    56.7K followersView on X
  • CyberDudeBivash® | Global Cybersecurity Company@cyberbivash
    Disclosure

    🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-3949 - strukturag libheif HEIF File decoder_vvdec.cc vvdec_push_data2 out-of-bounds Intel Report: https://ift.tt/FMaqSK9

    Post summary

    Intel has published an Intel Report on CVE-2026-3949, an out‑of‑bounds vulnerability in libheif's decoder. No PoC, exploit, active usage, or patch information is included.

    0000028
    343 followersView on X

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