VulnSocial

CVE-2025-31115Patch

LOWCVSS 8.7 · HIGH

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

XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-366CWE-416CWE-476CWE-826

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-06-30); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-30: 1Mentions · 2026-07-01: 1Patch / Workaround · 2026-06-30: 1Technical Details · 2026-06-30: 1Technical Details · 2026-07-01: 106-3007-01
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Referenced assets1 URL
Classification over time
DateTotalLabels
2026-06-301
Patch1
2026-07-011
Disclosure1
Full discourse2 posts
  • BREACHSPIDER@breachspider
    Disclosure

    [CVE Analysis] CVE-2025-31115: XZ Utils Threaded Decompression Flaw Reaches B&R Industrial PCs and Controllers https://breachspider.com/intel/2026-07-01-cve-2025-31115-xz-utils-threaded-decompression-flaw-reaches #ICS #OTSecurity #SCADA #CriticalInfrastructure

    Post summary

    The post announces that CVE‑2025‑31115, a threaded decompression flaw in XZ Utils, has reached certain B&R industrial PCs and controllers, but does not provide PoC, exploit code, or patch information.

    0000046
    2.3K followersView on X
  • Upwind Security MDR@UpwindMDR
    Patch

    🚨 HIGH - XZ Utils liblzma multithreaded decoder UAF crash (CVE-2025-31115) CVE-2025-31115 is a flaw in XZ Utils’ liblzma multithreaded .xz decoder, specifically impacting applications using the lzma_stream_decoder_mt function. The root cause is a heap use-after-free combined with unsafe NULL-derived pointer writes when handling malformed input. An attacker can trigger it by supplying a crafted invalid .xz stream to any service or tool that automatically decompresses untrusted data in multithreaded mode, with no special privileges beyond the ability to feed input. Successful exploitation can reliably crash the process (DoS) and may open a path toward memory corruption outcomes depending on hardening and surrounding code. 👉 Affected: XZ Utils 5.3.3alpha–5.8.0 | Upgrade to 5.8.1

    Post summary

    The post announces CVE‑2025‑31115, a heap UAF in XZ Utils’ liblzma multithreaded decoder that can cause DoS, and recommends upgrading to version 5.8.1.

    0000083
    232 followersView on X

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