CVE-2026-1940: An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function

Q: How do I fix CVE-2026-1940?

gst-plugins-good: downgrade or apply the listed mitigation; gstreamer: upgrade to 1.28.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-1940 being exploited?

CVE-2026-1940 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-1940 affect?

CVE-2026-1940 affects gst-plugins-good, gstreamer, debian linux. Severity is medium (CVSS 5.1). An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The patch added a size validation check lsize + 8 > size, but it does not account for the GST_ROUND_UP_2(lsize) used in the actual offs

Routine

MEDIUM 5.1WATCHLISTDOWNGRADEUPGRADEMITIGATE

CVE-2026-1940 is a medium-severity flaw (CVSS 5.1) affecting gst-plugins-good, gstreamer, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The patch added a size validation check lsize + 8 > size, but it does not account for the GST_ROUND_UP_2(lsize) used in the actual offset calculation. When lsize is an odd number, the parser advances more bytes than validated, causing OOB read.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-03-23
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · freedesktop · gstreamer · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-23 22:16 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

freedesktop gst-plugins-good DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy gst-plugins-good || rpm -q gst-plugins-good || gst-plugins-good --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison gst-plugins-good sudo apt install gst-plugins-good=<VERSION_BEFORE_1.0.0> sudo apt-mark hold gst-plugins-good

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gst-plugins-good sudo dnf downgrade gst-plugins-good-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add gst-plugins-good

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

gstreamer gstreamer UPGRADE

Affected: < 1.28.1

Fixed in: 1.28.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gstreamer || rpm -q gstreamer || gstreamer --version

2. UPGRADE to 1.28.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gstreamer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gstreamer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 11.0 · 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux MITIGATE

Affected: 7.0 · 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1940?

gst-plugins-good: downgrade or apply the listed mitigation; gstreamer: upgrade to 1.28.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-1940 being exploited?

CVE-2026-1940 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1940 affect?

CVE-2026-1940 affects gst-plugins-good, gstreamer, debian linux. Severity is medium (CVSS 5.1). An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The patch added a size validation check lsize + 8 > size, but it does not account for the GST_ROUND_UP_2(lsize) used in the actual offs

How urgent is CVE-2026-1940?

Priority 26/100. On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-46470 MEDIUM 4.0 UPGRADE An issue was discovered in GStreamer gst-plugins-good before 1.28.2
CVE-2026-46469 MEDIUM 4.0 UPGRADE An issue was discovered in GStreamer gst-plugins-good before 1.28.2

References

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