CVE-2026-56109

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks, parse_def() fails to check return values before continuing, causing snd_config_delete() to be called twice on the same already-freed node, resulting in a NULL-pointer write or invalid memory read.

CVSS v3
6.8
EG Score
6.8(high)
EPSS
3.6%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 23, 2026

Advisory Details (3)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

ALSA Library < 1.2.16.1 Double-Free via parse_def() in conf.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/alsa-library-double-free-via-parse-def-in-conf-c
generic🟡 PoC Available

Security: double-free / invalid pointer dereference in alsa-lib config parser (`parse_def`) via crafted configuration text - Luigino Camastra

https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_SiV6MQ@mail.gmail.com/
github_commit

commit 536dd6f8affd (alsa-project/alsa-lib)

Fix landed in alsa-project/alsa-lib commit 536dd6f8affd — awaiting tagged release

https://github.com/alsa-project/alsa-lib/commit/536dd6f8affdf5197c12a63a71c92a70b2833cc0

Vendor Advisories for CVE-2026-56109(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 14:11 UTCEG score recompute
  4. 2026-07-06 14:10 UTCGHSA enrichment
  5. 2026-07-05 16:03 UTCEG score recompute
  6. 2026-07-05 16:03 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 17:57 UTCEG score recompute
  10. 2026-07-04 17:57 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 19:51 UTCEG score recompute
  14. 2026-07-03 19:51 UTCGHSA enrichment
  15. 2026-07-02 21:46 UTCEG score recompute
  16. 2026-07-02 21:46 UTCGHSA enrichment
  17. 2026-07-01 23:41 UTCEG score recompute
  18. 2026-07-01 23:41 UTCGHSA enrichment
  19. 2026-07-01 15:07 UTCEPSS rescore
  20. 2026-07-01 01:36 UTCEG score recompute
  21. 2026-07-01 01:36 UTCGHSA enrichment
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 03:31 UTCEG score recompute
  24. 2026-06-30 03:31 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 26 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 05:26 UTCEG score recompute
  3. 2026-06-29 05:26 UTCGHSA enrichment
  4. 2026-06-28 14:07 UTCEPSS rescore
  5. 2026-06-28 07:18 UTCEG score recompute
  6. 2026-06-28 07:18 UTCGHSA enrichment
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 04:56 UTCEPSS rescore
  9. 2026-06-27 09:13 UTCEG score recompute
  10. 2026-06-27 09:13 UTCGHSA enrichment
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 11:07 UTCEG score recompute
  13. 2026-06-26 11:07 UTCGHSA enrichment
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-25 12:55 UTCEG score recompute
  16. 2026-06-25 12:55 UTCGHSA enrichment
  17. 2026-06-24 14:49 UTCEG score recompute
  18. 2026-06-24 14:49 UTCGHSA enrichment
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-23 21:33 UTCEPSS rescore
  22. 2026-06-23 16:44 UTCEG score recompute
  23. 2026-06-23 16:44 UTCGHSA enrichment
  24. 2026-06-22 19:40 UTCNVD updateCVSS v4 → 7 · severity → MEDIUM
  25. 2026-06-22 18:38 UTCEG score recompute
  26. 2026-06-22 18:38 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-56109?
CVE-2026-56109 is a medium vulnerability published on June 22, 2026. The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parsedef() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks,…
When was CVE-2026-56109 disclosed?
CVE-2026-56109 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56109 actively exploited?
CVE-2026-56109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56109?
CVE-2026-56109 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-56109?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56109, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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